Thermoplastic elastomers with crystalline domains

High-strength and temperature-resistant polymers Styrene-butadiene-styrene, triblock polymer, thermoplastic elastomer Crystalline domains with rigid chains between them and cross-finking chains Rigid-chain domains in a flexible-chain matrix... 

Polyetheramide. These thermoplastic elastomers are typically block copolymers of polyether rubber with nylon crystalline domains. 

Modern polymerization techniques, such as sequential iodine transfer polymerization of fluoroalkenes [11,12], lead to novel thermoplastic elastomers (TPEs). These triblock copolymers can be produced in a process, which can be emulsion, suspension, microemulsion, or solution polymerization [13], Using pseudo-living technology or branching and pseudo-living technology, A-B-A phase separated copolymers with soft (amorphous) and hard (crystalline) domains can be produced. The hard domains can be composed from the following ... 

Rubbery behavior—large, reversible extensibility—implies an absence of crystallinity, and this is usually the case for undeformed elastomers. However, small extents of crystallization may be present at ambient temperature in some elastomers, including EPDM with high ethylene content, epichlorohydrin rubber, and polypropylene oxide. The crystallites in these materials can act as reinforcing agents. Many thermoplastic elastomers have crystalline domains that function as reversible crosslinks (Rzymski and Radusch, 2005 Bhowmick and Stephens, 2001). 

Later development of vulcanization technology has involved peroxide crosslinking and thermoplastic elastomers. The latter consist of block copolymers with hard segments (physical crosslinks) and flexible segments (Fig. 3.6). The crosslink domains are either glassy amorphous or crystalline. These materials can be processed by conventional thermoplastic process-... 

Table 13.3. Composition, annealing temperature T of 5x drawn samples, degree of crystallinity of PBT, tUj, glass transition temperature of the soft domains, Tg, measured microhardness, calculated inicrohardness, H i, (according to Eq. (13.1), with H = 0) and H, (according to Eq. (13.8), with H 0), and the difference between measured and calculated values, AH AH =H i H ) and AH" AH"=H i H, respectively, for thermoplastic elastomers of PEE- or PEEC-type [1]...

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