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Applied Rheology

SPE Library content related to rheology

Effect of mixing time and temperature on the rheology and morphology of immiscible polymer blends prepared from polytrimethylene terephthalate [PTT] and polyamide 6,10 [PA6,10]. Kevin Lucero, Marissa

Kevin Lucero, Marissa Tierno, Richard L. Lehman, Giorgiana Giancola, May 2013

Thermoplastic immiscible polymer blends were prepared from polytrimethylene terephthalate [PTT] and polyamide 6,10 [PA6,10] by melt processing in a Brabender mixer to assess morphology developed between the immiscible domains. PTT and PA6,10 were selected as a pair of engineering polymers with complementary properties and as a blend prepared to significant extent from bio-based precursors. Overall, a 50/50 blend of these polymers has a renewable content of nearly 50%. The overall objective is to develop an engineering blend with good stiffness, strength, and dimensional stability while simultaneously being easy to process. In the present phase of the work, blend homogeneity was studied as a function of mixing time and temperature in the range of t=0-25 minutes and T=240-260 C. Results are presented in terms of torque versus time and temperature curves that are interpreted in terms of domain formation and SEM micrographs are used to define domain size and overall morphology.

Characterization of Novel One-Step Processed FG-PTT

Arya Tewatia, Jennifer Lynch, Thomas Nosker, May 2013

PET, PBT and Poly (trimethylene terephthalate) (PTT), of the polyester resin family, potentially compete for the same engineering-grade thermoplastic market. PTT’s crystallization rate relative to those of PET and PBT, suggests its high suitability for injection molding applications. The aim of this work is to produce a viable PTT candidate for engineering structural applications. To this end, fiberglass (FG) reinforcement, a commonly used method of improving polyester properties, is in a one-step novel process blended with PTT at 10%, 15%, 20%, and 30% FG. The mechanical, rheological, thermal and morphological properties of the FG-PTT composite are presented.

Nanocomposites via sol-gel reaction and nylon polymerization

Zehra Kalkan , Lloyd A. Goettler, April 2013

Combining two common polymerization techniques generates reinforcing particles that increase modulus up to 20%.

Enhancing polyamide properties with alumina whiskers

Francisco Guitian, J. Miguel Caamano, Victor Valcarcel, Carmen Cerecedo, Xoan Garcia, Rosalia Noguerol, Maria Jose Abad , Ana Ares, March 2013

Short fibers with a different morphology and composition can improve the thermal stability of polyamide composites.

Halloysite nanotubes as reinforcing fillers in polymeric nanocomposites

Rosario Elida Suman Bretas, Juliano Marini, March 2013

Modifying the surface of halloysite nanotubes by grafting with an aminosilane increases the dynamic-mechanical properties of the nanocomposite.

High-shear-rate capillary rheology of polystyrene melt

Wei-Sheng Guan , Han-Xiong Huang, February 2013

A systematic investigation of the superimposed effects in high-shear-rate capillary flow of polystyrene melt yields the polymer's true shear viscosity curve.

Palm-oil-based unsaturated polyester

Choay Mon Lai, Hj Din Rozman, Guan-Seng Tay, February 2013

The activation energy for synthesizing unsaturated polyester from palm oil using different reactant ratios and catalysts was investigated, along with the solubility and miscibility behavior of the resultant polymer.

Optical performance of gas-assist injection molding

Antonio J. Carrillo, Avraam I. Isayev, January 2013

Simulation and experimentation are used to analyze birefringence in objects produced by the gas-assist injection molding process.

Ultrafine rubber particles raise thermoplastic's glass transition temperature

Xiang Wang , Guicun Qi, Xiaohong Zhang, Jinliang Qiao, December 2012

Adding ultrafine full-vulcanized powdered rubber substantially increases a thermoplastic's glass transition temperature, due to the restricted motion of plastic chains at the interface layer.

Key factors affecting processing of natural fiber composites

Exequiel Rodriguez , Gaston Francucci, Edu Ruiz, Analia Vazquez, December 2012

Processing variables must be considered when replacing synthetic with natural fibers in polymer matrix composites.

Effect of nanosilica on vulcanizates of natural and reclaimed rubber

Abu Ismail Jaman, Satyaban Bhunia, Madhusudan Roy, Prabir Kr. Panda, Debapriya De, December 2012

Adding nanosilica to vulcanizates of natural and reclaimed rubber enhances their reinforcing efficiency, tensile properties, and thermal stability.

Partial carbon black replacement by nanoclay for enhanced crosslinking

Jyrki Vuorinen, Wilma Dierkes, Minna Poikelispaa, Amit Das, Janak Sapkota, November 2012

The curing reaction of a rubber compound was more efficient with an organoclay-carbon black hybrid filler system.

Evaluating phase inversion during high-impact polystyrene synthesis by means of rheology

Isaac Cano, Pablo Acuna, Ramon E. Diaz de Leon , Florentino Soriano-Corral, November 2012

Rheological evaluation of relaxation times makes it possible to estimate the occurrence of a crucial switch in phases that determines the final properties of high-impact polystyrene.

Rheological understanding of polymer-filler interactions

Anup K. Ghosh, Sanjukta Bose, Susanta Mitra, Sangita Nandi, November 2012

Dynamic rheology was used to explore how high density polyethylene interacts with different amounts of fumed silica nanofiller, both with and without the addition of a compatibilizer.

Differentiating structure and stability in high -performance thermoplastics

Tim Bremner, Nangelie Ferrer, Minhao Wong, Lin Jin, Hung-Jue Sue , Kevin Lee White, October 2012

Melt rheology can probe the molecular-scale structure of several grades of commercially available polyaryletherketones.

Designing water -soluble polymers for enhanced oil recovery

Xiuhua Shan, Xiaoyan Wu, Bin Xu, Shuren Liu, Lingwei Meng, Xianzhong Wang, Wanli Kang, October 2012

Modifying polyacrylamides with hydrophobic co-monomers containing aryl and alkyl disubstituted acrylamide improves thickening properties and surface activity at the liquid-air interface.

Predicting orientation of long-fiber suspensions

Alex Aning, Peter Wapperom, Donald Baird, Kevin Ortman, September 2012

Applying a novel continuum model of semi-flexible fibers demonstrates the potential for improved understanding of long glass fiber behavior in an injection-molded disk.

Determining the aspect ratio of graphene nanocomposites by indirect measurements

Carola Esposito Corcione , Fabrizio Freuli, Alessia L'Erario, Alfonso Maffezzoli, August 2012

The measurement of the engineering properties of nanocomposites provides information about the average degree of graphene filler dispersion.

Predicting layer rearrangement in extrusion

Jovani Favero, Lori Holmes , Tim Osswald, August 2012

Numerically simulating and predicting viscoelastic materials' secondary flow behaviors could help optimize extruder designs and process parameters.

Optimum dispersion of single-walled nanotubes in epoxy resins

Cihan Uzunpinar, Mirna A. Mosiewici, Maria L. Auad, July 2012

Mechanical and chemical treatment of carbon nanotubes can improve their ability to disperse uniformly in epoxy resins and, as a result, alter the rheological behavior of the composite materials.

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