Polymer00076 - fluorothermoplastic and a fluoroelastomer...

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65 For example, in poly-(styrene- b -butadiene- b -styrene) (SBS) triblock copolymers, polystyrene micro domains dispersed in the continuous rubbery poly(butadiene) matrix. Mechanical properties of the polymer could be controlled by changing the ratio of the styrene to butadiene blocks (Rader, 1996). Weidisch et al. (2001) showed that in the polystyrene(PS)-polyimide(PI) multigraft copolymer, the number of PS branch points on the PI backbone played a determining role in the morphology and mechanical properties of the copolymer. To study the phase morphology of TPE, nuclear magnetic resonance (NMR) (Powers et al. 2008), scanning electron microscopy (SEM) (Cheng et al. 2008) and transmission electron microscopy (TEM) (Zhu et al. 2006) are usually used. . Fluorothermoplastic elastomers (F-TPE), sometimes also referred to as fluorinated thermoplastic rubbers, are a class of fluorocopolymers or a physical mix of fluoropolymers (usually a plastic and a rubber) which combines the properties of a
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Unformatted text preview: fluorothermoplastic and a fluoroelastomer. Generally, these types of materials show the following advantages: (1) advantages typical of both rubbery materials and plastic materials, (2) processable and recyclable like thermoplastic, (3) great properties improvement achieved by small amount reinforced nanofillers. While the advantages of TPE lead to extensive applications, the limitations are also obvious: high cost of raw materials and higher temperature sensitivity than competitive elastomer. For example, Acquarula et al. (1999) showed that the crosslinking method of copolyamide-containing TPE had a significant effect upon elevated temperature performance. To obtain high performance F-TPE, the material is often generated by dynamic vulcanization, a process of vulcanizing the elastomer during its melt-mixing with a non-vulcanizing thermoplastic polymer (Holden, et al. 2004). In contrast, static vulcanization...
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This note was uploaded on 08/18/2011 for the course MATSE 447 taught by Professor Colby,r during the Spring '08 term at Penn State.

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