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Polymer Alloy (polymer + alloy)

Distribution by Scientific Domains

Polymers and Materials Science	80%

Selected Abstracts

Studies on the rheological properties and compatibility of low molecular weightPC and PS polymer alloy,

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 3-5 2003
Jun Liu
Abstract The rheological properties and compatibility of PC/PS containing SMA are determined and the possibility of the alloy being used as a new disc material is also discussed in this paper. The results showed that the ,a of the alloy decreased markedly on increasing the temperature, shear rate and PS content in the alloy. In addition, it was confirmed by DSC that PC was partly compatible with PS. The influence of SMA added into PC/PS on the compatibility was also studied. The results showed that SMA has compatibilization, apparent viscosity ,a of the systems could be lowered by the addition of the compatibilizer, and the results of DSC showed that the Tg of the PC phase got closer to the Tg of the PS phase, until it has only one Tg. Using SEM, the microstructure of the polymer alloy was studied. It indicated compatibilization was better, consistent with the result of DSC. Finally, it is discussed whether the PC/PS alloy systems with the compatibilizer could be used as the substrate material for optical disks. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Biological Reactions Resulting from Endotoxin Adsorbed on Dialysis Membrane: An In Vitro Study

ARTIFICIAL ORGANS, Issue 2 2004
Kenji Tsuchida
Abstract:, Some types of dialysis membrane are known to adsorb endotoxin (ET). It is suggested that the biocompatibility of dialysis membrane is enhanced by adsorption and inhibition of ET. This study attempts to clarify the membrane-mediated biological reaction of the ET that is adsorbed to a dialysis membrane. After a dialysis circuit was prepared, contaminated dialysate was introduced on the dialysate side of a polyether polymer alloy (PEPA) membrane that adsorbs ET while saline solution or blood were introduced on the blood side, and the difference in ET adsorption between the two set-ups was measured. Further, the side filled with blood was left standing for 2 h, after which the changes in the amount of interleukin 1 receptor antagonist (IL-1Ra) produced from the whole blood were also assayed. Significantly more ET was adsorbed to the dialysis membrane when blood rather than saline was on the other side. In addition, the IL-1Ra production from the dialysis membrane that adsorbed ET was significantly higher. The ET adsorbed to the dialysis membrane may influence a living body even if it does not pass through the membrane. Accordingly, it is difficult to assume that the adsorption of ET to the membrane enhances its biocompatibility. [source]

The effect of interface characteristics on the static and dynamic mechanical properties of three-component polymer alloys

POLYMER COMPOSITES, Issue 3 2002
I. Fisher
The effect of interfacial characteristics on the structure-property relationships of ternary polymer alloys and blends comprising polypropylene (PP), ethylene-vinyl alcohol copolymer (EVOH) and glass beads (GB) or fibers (GF) was investigated. The systems studied were based on a binary PP/EVOH immiscible blend, representing a blend of a semi-crystalline apolar polymer with a semi-crystalline highly polar copolymer. The ternary systems studied consisted of filler particles encapsulated by EVOH, with some of the minor EVOH component separately dispersed within the PP matrix. Modification of the interfacial properties was done using silane coupling agents for the EVOH/glass interface and compatibilization using a maleic anhydride grafted PP (MA-g-PP) for the PP/EVOH interface. Both glass fillers increased the dynamic modulus and decreased the damping of the neat polymers and of their binary blends, especially in the rubbery region. GF has a more profound effect on both the modulus and the damping. Glass surface treatments and compatibilization have only a marginal effect on the dynamic mechanical behavior of the ternary blends. Yet, compatibilization shifted the polymers' TgS to higher temperatures. Both glass fillers increased the elastic modulus of the binary blends, where GF performed better than GB as a reinforcing agent. GF slightly increased the strength of the binary blends while, GB reduced it. Both fillers reduced the ductility of the binary blends. The blends' mechanical properties were related to the morphology and their components' crystallinity. The compatibilizer increases both stiffness and strength and reduces deformability. [source]