2 edition of Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow. found in the catalog.
Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow.
Wanlin Chen
Published
2005 .
Written in
The objective of this thesis was to investigate rheological effects on the morphology of a polymer blend composed of 75 wt% Ziegler-Natta isotactic polypropylene and 25 wt% metallocene ethylene copolymer. This blend is a new class of thermoplastic polyolefin blends widely used in the automotive industry for making parts such as bumpers and fenders. Three steps were taken to meet the objective. First, viscoelastic properties of the blend components under shear were measured. Secondly, the blend was sheared in a microchannel at two processing temperatures. Above the equilibrium melting temperature of the polypropylene, shear-induced crystallization was found to be negligible. Below the melting temperature, on the other hand, crystallization was observed via the real time relative intensity and birefringence, ex situ polarized light microscopy and differential scanning calorimetry. Blend samples were obtained after different shear conditions, and were examined by laser scanning confocal fluorescence microscopy. Thirdly, the rheological and the morphological data were related by evaluating them in terms of distance from the channel centreline. It was found that droplet size is significantly influenced by droplet elasticity and coalescence, and that droplet size increases with elasticity ratio. As a result, and contrary to expectations, droplet size increased with distance from the centreline. With shear-induced crystallization, morphology depends on the interaction between rheology and crystallization. It appears that increasing droplet elasticity may lead to retraction of fibrous droplets, which would have been trapped by shear-induced crystallization.
| The Physical Object | |
|---|---|
| Pagination | 157 leaves. |
| Number of Pages | 157 |
| ID Numbers | |
| Open Library | OL19475663M |
| ISBN 10 | 0494028408 |
At low extrusion rates, the triblock and pentablock copolymers display different bulk orientation behavior, leading to relatively smooth surfaces in both cases. Above a characteristic wall shear stress, associated with a slope change in the flow curve, both polymers exhibit perpendicular lamellae alignment but dramatically different surface Cited by: A polymer (/ ˈ p ɒ l ɪ m ər /; Greek poly-, "many" + -mer, "part") is a large molecule, or macromolecule, composed of many repeated subunits. Due to their broad range of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that. often added such as ethylene–propylene block copolymer also known as ethylene–propylene rubber. Chiu and Fang [24] blended PP and LDPE and added ethylene–propylene copolymer (either random or block) to improve interfacial adhesion. The impact strength of the blend with the random copolymer was larger by a factor of six than the impact. So the copolymer may be affecting blend rheology in one of two ways: by modification of the interface or by modification of the viscosity of the PE phase. By which mechanism the addition of copolymer affects blend rheology and morphology will be discussed in .
Polymer Processing and Rheology. , flow models and design tools for shaping polymeric materials into products for various industry sectors: compatibilizer at different interface sites have been investigated on the morphology and rheology of polypropylene nanocomposites in the melt-compounded state.
Fiscal Policy Implications of the 1988 Medicare Catastrophic Coverage Act
Headshot
Parish council accounts
System Analysis Design
Court work
Strength for living
How to answer all those mortgage and other loan queries
I Went Walking Big Book Prepack
Index to the county records in the record room at the County Offices and (where indicated) at the Shire Hall, Dorchester.
Guide to vital statistics records of churches in New York State (exclusive of New York City)
Certified nurse-midwives
Introduction. Polymer blend nanocomposites containing an elastomer and a reinforcing filler have attracted much attention due to the incorporation of the properties of both polymer blends and polymer nanocomposites.Polypropylene Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow.
book copolymer (EOC)/clay nanocomposites are such high performance by: Relationships between rheology and morphology for immiscible molten blends of polypropylene and ethylene copolymers under shear flow Journal of Rheol 41 ( “ Rheology/morphology/flow conditions relationship for polymethylmetacrylate/rubber blend,” by: Rheology and flow-induced morphology were studied in immiscible polypropylene (PP)/polystyrene (PS) blends with a droplet–matrix microstructure.
Two reactive precursors, maleic anhydride grafted PP and amino terminated PS, were added during the melt-mixing process to form a graft copolymer. The effects of both the amount of compatibilizer and the shear history on the Cited by: This work aims to use the Palierne emulsion type model to describe the relationship between the rheological response to small amplitude oscillatory deformation and morphology of polypropylene/polyamide 6 (PP/PA6) blends compatibilized with maleic anhydride grafted polypropylene (PP-g-MAH).
It was found that the Palierne emulsion type model could describe very Cited by: Blends of polypropylene (PP)/ethylene-octene copolymer (EOC) was studied.
The influences of blend composition and processing conditions on phase morphology development of the blends were investigated by scanning electron microscopy (SEM) in detail. The minor composition formed the dispersed phase and the major composition formed the continuous phase, and the blends formed Cited by: The morphological evolution during extrusion and rheological properties of polypropylene (PP) and ethylene–octene copolymer (EOC) blends were studied.
It can be observed that the PP/EOC (70/30) blends has already formed a well-established droplet/matrix morphology at Valve by: Rheology and Foaming of Long-Chain Branched Ethylene-Tetrafluoroethylene Copolymer and Its Blends E.
Nishi 1, T. Satou 1, S. Sukumaran 2, T. Katou 2, M. Sugimoto 2 * and K. Koyama 2 1 Research and Development Division, Asahi Glass Co., Ltd., Ichihara, Chiba, JapanAuthor: E.
Nishi, T. Satou, S. Sukumaran, T. Katou, M. Sugimoto, K. Koyama. Rheology and morphology of nanosilica‐containing polypropylene and polypropylene/liquid crystalline polymer Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow.
book Article in Journal of Applied Polymer Science (6) June with 13 Reads. Introduction. Polypropylene (PP) is a semi-crystalline polymer, finding use in a wide variety of industrial applications mainly because of its ease of processing, chemical resistance, low density (typically g/cm 3) and relatively low r, its use as an engineering plastic has been limited by its poor impact properties, particularly at low temperatures, due to its high glass Cited by: Application of Polymer Rheology in Melt Blowing Process and Online Rheological Sensor Yizhong Wang Yizhong, "Application of Polymer Rheology in Melt Blowing Process and Online Rheological Sensor.
" PhD diss., University of Tennessee, polypropylene (PP) under different processing conditions were determined by. Blends of polypropylene (PP) and ethylene–octene copolymer (EOC) across the whole composition range (10, 20,80, 90 wt.%) were investigated with focus on mechanical properties.
Samples (0–50% of PP) were stretched in a tensile machine to given elongations (, and %) and then the crosshead returned to the initial by: Rheology, Mechanical Properties and Morphology of Poly(lactic acid)/Ethylene Vinyl Acetate Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow.
book Article in Journal of Polymers and the Environment 27(7) April with 62 Reads. Tuning the nano/micro-structure and properties of melt-processed ternary composites of polypropylene/ethylene vinyl acetate blend and nanoclay: The influence of kinetic and thermodynamic parameters.
Journal of Applied Polymer Science(1), DOI: /appCited by: Morphology of Poly(ethylene terephthalate) Blends: An Analysis under Real Processing Conditions by Rheology and Microscopy Article in Advances in Polymer Technology 28(3) - December. Effect of polypropylene on the rheology of co‐continuous PS/SEBS blends Article in Polymer Engineering and Science 45(10) - October with 21 Reads How we measure 'reads'.
Flow marks in injection molding of polypropylene and ethylene–propylene elastomer blends: Analysis of morphology and rheology Article in Journal of Applied Polymer Science 96(2) - Immediate online access to all issues from Subscription will auto renew by: 1. A study of the rheological behaviour of polyamide 6 (PA6) and PA6/ethylene-vinyl acetate copolymers (EVA) blends in the molten state is reported.
Zero shear viscosity, η 0, and the activation energy for the viscous flow, Δ E *, were obtained as functions of both composition and molar mass of the by: Blends of isotactic polypropylene and ethylene-propylene rubbers: rheology, morphology and mechanics Sergio Danesi* and Roger S.
Porter Polymer Science and Engineering Department, Materials Research Laboratory, University of Massachusetts, Amherst, MassachusettsUSA (Received 22 June ; revised 7 October ) Blends of isotactic polypropylene and ethylene-propylene Cited by: of polypropylene/EDPM blends: controlled rheology and morphology fixation via electron beam irradiation J.
van Gisbergen, H. Meijer and P. Lemstra* Eindhoven University of Technology, Department of Polymer Technology, PO BoxMB Eindhoven, The Netherlands. A blend made of PP as a matrix with a PET dispersed phase has been compatibilized with a rubbery sample of SEBS copolymer grafted with maleic anhydride.
The compatibilization improves the viscosity in shear flow of the uncompatibilized blend, and significantly improves the rheology of the blend in non-isothermal elongational by: 5. Winnik, Derek W. Thurman, James P.
Oberhauser, Julia A. Kornfield and Rose A. Ryntz, Stratified morphology of a polypropylene/elastomer blend following channel flow, Journal of Polymer Science Part B: Polymer Physics, 40, 24, (), ().Cited by: and the polypropylene matrix.
The results showed that the elastomeric phase acts as the nucleating site and the final cellular morphology of the TPOs can be directly correlated to the initial blend microstructure. It was also shown that the melt elongational properties of the TPOs. In either case, since rheology is an indirect and non-unique measurement of structure, the application of rheology to solving processing and product performance problems often reduces to comparative analysis of good and poor performing samples.
Thermoplastic solids are tested using Mechanical Spectroscopy to study polymer morphology and structure. Polypropylene Moplen C30G was a pro-duct of Basell (Italy): melt flow index MFI (C, kg)¼ g/10 min; density: g/cm3; crystallinity: 45%.
An amorphous cycloolefin copolymer produced under the trade name Topas was a product of Ticona, Celanese (Germany), consisting of 30% of bicyclo()heptene (norbor. shear and morphology evolution as well as the effects on the corresponding rheological response.
In the present paper, we intend to simulate the morphology evolution and the corresponding rheology of a phase-separating blend under oscillatory shear.
The simulations are based on the time-dependent Gin-zburg-Landau (TDGL) equation. The aim of present. Kontopoulou M, Wang W, Gopakumar TG et al () Effect of composition and comonomer type on the rheology, morphology and properties of ethylene-α-olefin copolymer/polypropylene blends.
Polymer – Interfacial agents are often used to compatibilize immiscible polymer blends. They are known to reduce the interfacial tension, homogenize the morphology, and improve adhesion between phases. In this study, two triblock copolymers of styrene/ethylene−butylene/styrene (SEBS), of different molecular weights, were used to compatibilize a blend of 80 vol % polystyrene (PS) and 20% ethylene Cited by: Morphology Development in HDPE/Copolymer Blends: Quiescent and Flow-Induced Crystallization The flow channel is a rectangular slit with an aspect ratio greater than 10 in order to approximate a two-dimensional flow profile (width = mm, height = mm, length.
Morphol. characterization of blends of liq. cryst. ethylene glycol-p-hydroxybenzoic acid-terephthalic acid copolymer (I), nylon 66 (II), and a polycarbonate (PC) by single-screw extrusion, steady simple shear flow, and flow through a capillary, to det.
what conditions were necessary for development of a fiber morphol. of I, showed that some Author: Gijs W. de Kort, Sanjay Rastogi, Carolus H.
Wilsens. Handge; Institute of Polymers, Department of Materials, ETH Zürich, HCI HCH Zürich, Switzerland; P. Pötschke; Institute of Polymer Research Dresden, Department of Polymer Reactions and Blends, Hohe Strasse 6, D Dresden, GermanyCited by: Ethylene–octene copolymer (POE) Engagewith melt flow index (MFI) of 13 g/10 min at °C and a density of g/cm 3 was purchased from Dow, Midland, USA.
This degree was chosen by its easy processability. The used blowing agent was Hydrocerol BIH 40 provided by by: 2. The adhesion under shear stresses of the EBA copolymer and EBA copolymer + ECH resin blends was obtained by single lap-shear tests of aluminum /copolymer or binary blend/aluminum joints (Figure 2b); aluminum test samples of dimensions 30 × × 1 mm were used and the copolymer or the binary blend was applied in an area of mm by: 3.
SEM, AFM and LFM Study of the Worn Surface of C/C Composites with Smooth Lamination and Rough Lamination/Resin Carbon Matrixes pCited by: 1. The effects of “short term shearing” on the subsequent crystallization of a polydisperse Ziegler−Natta isotactic polypropylene are observed using in situ optical measurements and ex situ microscopy.
Imposition of brief intervals of shear (−20 s, less than a thousandth of the quiescent crystallization time) can reduce the crystallization time by 2 orders of magnitude (e.g., at Cited by: Polypropylene Rheology- QC the degraded polymer there is a change in behavior to be expected at e.g.
sagging under gravity. This can cause surface defects in the finished product or influence its stability and thickness. A test that can directly be connected to the flow. Creep experiments were performed on samples with various initial droplet sizes under different constant stresses using an oilbath rheometer.
At the end of each experiment, the samples were quickly removed from the rheometer and quenched in liquid nitrogen to freeze in the by: 9.
rheological properties of bitumen modified by thermoplastic namely linear low density polyethylene (LLDPE), high density polyethylene (HDPE) and polypropylene (PP) and its interaction with 80 pen base bitumen.
As it is known that the modification of bitumen by the use of polymers enhances its performance characteristics but at the same. So far, several strategies have been proposed to improve the melt strength of iPP.
For example, increasing the M w, broadening the M w distribution [], or introducing long chain branches (LCBs) [2,3], are some of the methods adopted to improve the melt them, the most efficient way is to introduce LCBs onto the backbone of iPP [].Until now, some approaches have been developed to Cited by: 4.
Morphology and Mechanical Properties of Poly(Lactic Acid) and Propylene-Ethylene Copolymer Blends: Effect of Organoclay Types p Comparison of Mechanical Properties of Biocomposites between Polybutylene Succinate/Corn Silk and Polybutylene Succinate/Cellulose Extracted from Author: Sirirat Wacharawichanant, Chaninthon Ounyai, Ployvaree Rassamee.
Acrylonitrile butadiene styrene (ABS) is the oldest fused filament fabrication (FFF) material that shows low stability to thermal aging pdf to hydrogen abstraction pdf the butadiene monomer.
A novel blend of ABS, polypropylene (PP), and polyethylene graft maleic anhydride (PE-g-MAH) is presented for FFF. ANOVA was used to analyze the effects of three variables (bed temperature, printing Author: Muhammad Harris, Johan Potgieter, Sudip Ray, Richard Archer, Khalid Mahmood Arif.G.
Prasath Balamurugan and S.N. Maiti, Interfacial slip‐stick transition induced by reactive compatibilization in ethylene‐co‐butyl acrylate elastomer dispersed polyamide 6 blend subjected to high shear flow and extensional flow, Polymer Engineering & Science, 48, 12, (), ().Cited by: Abstract.
High density polyethylene (HDPE)/ethylene-vinyl acetate copolymer (EVA) ebook with selective crosslinking the EVA phase were prepared and the crystallization, rheological, and mechanical behaviors were studied.
