نتایج جستجو برای: polymer microstructure

تعداد نتایج: 132259  

Fardin Seyyed Najafi Fatemeh Rekabdar Heidar Ranjbar Mahdi Abdollahi, Mohammad Reza Yousefi Parisa Alamdar

Polybutadiene nanoparticles were synthesized via batch emulsion polymerization of butadiene in the presence of potassium persulfate, disproportionate rosinate potassium cation and t-dodecyl mercaptane as initiator, emulsifier and chain transfer agent, respectively. Polymerization reaction was performed at different temperatures (60, 70 and 80 °C). Conversion was measured at the various time int...

Journal: :Journal of the American Chemical Society 2012
Ying Diao Kristen E Whaley Matthew E Helgeson Mahlet A Woldeyes Patrick S Doyle Allan S Myerson T Alan Hatton Bernhardt L Trout

Although nanoporous materials have been explored for controlling crystallization of polymorphs in recent years, polymorphism in confined environments is still poorly understood, particularly from a kinetic perspective, and the role of the local structure of the substrate has largely been neglected. Herein, we report the use of a novel material, polymer microgels with tunable microstructure, for...

2014
Hongyi Xu Ruoqian Liu Alok Choudhary Wei Chen

In designing microstructural materials systems, one of the key research questions is how to represent the microstructural design space quantitatively using a descriptor set that is sufficient yet small enough to be tractable. Existing approaches describe complex microstructures either using a small set of descriptors that lack sufficient level of details, or using generic high order microstruct...

2010
Sunhyung Kim Jun Hee Sung Kyung Hyun Ahn Seung Jong Lee

Film formation of particle/binder/solvent system is of importance in various applications to produce battery, display, electronic components and so on. Because dispersion stability is a crucial issue for defect-free final products, many attempts have been carried out to analyze and control the microstructure of the suspension. In this study, The effect of polymers on dispersion stability and fi...

2015
Azadeh Sheidaei Farhang Pourboghrat

In recent years, polymer nano-composites (PNCs) have increasingly gained more attention due to their improved mechanical, barrier, thermal, optical, electrical and biodegradable properties in comparison with the conventional micro-composites or pristine polymers. With a modest addition of nanoparticles (usually less than 5wt. %), PNCs offer a wide range of improvements in moduli, strength, heat...

2007
Liang-Yin Chu Jin-Woong Kim Rhutesh K. Shah David A. Weitz

Stimuli-sensitive hydrogel microspheres or microgels are polymeric particles that consist of cross-linked three-dimensional networks. They shrink or swell significantly by expelling or absorbing large amounts of water in response to external stimuli, such as changes in temperature, pH, electric or magnetic fields. The chemical composition of the microgel determines the stimulus that can trigger...

2015
Martin Drábik Josef Pešička Hynek Biederman Dirk Hegemann

Nanocomposite coatings of silver particles embedded in a plasma polymer matrix possess interesting properties depending on their microstructure. The film microstructure is affected among others also by the RF power supplied during the deposition, as shown by transmission electron microscopy. The optical properties are characterized by UV-vis-NIR spectroscopy. An anomalous optical absorption pea...

2015
Matias Soto Milton Esteva Oscar Martínez-Romero Jesús Baez Alex Elías-Zúñiga

A methodology was developed for the prediction of the electrical properties of carbon nanotube-polymer nanocomposites via Monte Carlo computational simulations. A two-dimensional microstructure that takes into account waviness, fiber length and diameter distributions is used as a representative volume element. Fiber interactions in the microstructure are identified and then modeled as an equiva...

2016
B.R. Bharath Kumar Mrityunjay Doddamani Steven E. Zeltmann Nikhil Gupta Seeram Ramakrishna

The data set presented is related to the tensile behavior of cenosphere reinforced high density polyethylene syntactic foam composites "Processing of cenosphere/HDPE syntactic foams using an industrial scale polymer injection molding machine" (Bharath et al., 2016) [1]. The focus of the work is on determining the feasibility of using an industrial scale polymer injection molding (PIM) machine f...

2007
STEFAN MECKING

By contrast to traditional free radical emulsion polymerization, catalytic polymerization allows for polymer microstructure control. In terms of monomers polymerizable, both techniques are largely complementary. Since the beginning of this decade, an increasing number of reports on polyolefin, polybutadiene, polyalkenamer, polynorbornene, polyketone and polyacetylene dispersions prepared by cat...

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