Dynamic properties blends

Interfacial adhesion and, thereby, compatibility can be enhanced by the selective crosslinking reaction in polymer blends. Inoue and Suzuki [26] reported the properties of blends dynamically crosslinked PP-EPDM blends. The crosslinking agent was yV,N -/w-phenylene-bismaleimide - poly(2,2,4 - trimethyl - 1,2-dihydroquino -line) system. Increase in interfacial adhesion leads to... 

The static and dynamic mechanical properties, creep recovery behaviour, thermal expansion and thermal conductivity of low-density foams made of blends of LDPE and EVA were studied as a function of the EVA content of the blends. These properties were compared with those of a foam made from a blend of EVA and ethylene-propylene rubber. A knowledge of the way in which the EVA content affects the behaviour of these blend foam materials is fundamental to obtaining a wide range of polyolefin foams, with similar density, suitable for different applications. 9 refs. 

Figure 4. Dynamic properties of 1 1 mechanical blend of Polymers A(10% styrene) and E(50% styrene)...

Figure 8. Dynamic properties of five-component blend (Polymers A to E)...

In the present section an attempt is made to describe both stress-optical and dynamic properties of blends in terms of those of the components, using a more detailed, but simple equivalent mechanical model. We consider a (binary) blend as consisting of domains of Polymer 2 dispersed in Polymer 1. These domains are thought to be coupled in series-parallel fashion. The simple analysis of the stress-optical coeffi-... 

EPR/PP Blends Lee and Chen [1983] investigated gamma-radia-tion-induced changes in the dynamic properties of PP, EPR and PP/EPR blends (Table 11.9). EPR pellets were ground in a Thomas-Wiley laboratory mill, and the EPR powder was dried at RT. PP powder was dried at 80°C in a vacuum oven for 2 h. The dried resins were mixed in a kneader, extruded using a single-screw machine and pelletized. The pellets were dried in the vacuum oven... 

Typically a 50/50 blend of nitrile rubber and polypropylene is melt mixed with 5% maleated PP and 1% ATBN respectively and then cured with SnClj (0.5%). The resistance to hot oil swell (72 hr, 100°C) of NBR/PP blend is significantly better than that of EPDM/PP blend. Typical properties of the commercial dynamically cured NBR/PP blend (Geolast ) are compared with other such blends in Table 15.13. 

The hole fraction, h, computed from the PVT data, was found to correlate with the static (thermodynamic equilibrium) and dynamic properties (e.g., flow of polymers) [Utracki, 1986 2005], as well as their blends, foamed compositions [Utracki and Simha, 2001a,b], composites, and nanocomposites (see Chapter 14). 

Moving beyond isotopic blend systems, we find that most polymer pairs have markedly different dynamic properties, so we caimot hope to describe these... 

The dynamic properties, temperature transitions and thermal stability of PEEK-thermotropic liquid crystalline polymer blends. Pdlym. Eng. Sd., 31, 963. 

Chiu, H.-T. Wu, J.-H. Shong, Z.-J., Dynamic Properties of Rubber Vibration Isolators and Antivibration Performance of a Nanoclay-Modified Silicone/ Poly(propylene oxide)-Poly(ethylene oxide) Copolymer with 20 Wt.% LiC104 Blend System. J. Appl. Polym. Sci. 2006,101, 3275-2381. 

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