High Temperature Thermoplastic Elastomers Synthesized by Living Anionic Polymerization in Hydrocarbon Solvent at Room Temperatuie

作者：Wang Weiyu; Schlegel Ralf; White Benjamin T; Williams Katherine; Voyloy Dimitry; Steren Carlos A; Goodwin Andrew; Coughlin E Bryan; Gido Samuel; Beiner Mario; Hong Kunlun; Kang Nam Goo^*; Mays Jimmy^*

来源：Macromolecules, 2016, 49(7): 2646-2655.

DOI：10.1021/acs.macromol.5b02642

We present the synthesis and characterization of a new class of high temperature thermoplastic elastomers composed of polybenzofulvene polyisoprene polybenzofulvene (FIF) triblock copolymers. All copolymers were prepared by living anionic polymerization in benzene at room temperature. Homopolymerization and effects of additives on the glass transition temperature (T-g) of polybenzofulvene (PBF) were also investigated. Among all triblock copolymers studied, FIF with 14 vol % of PBF exhibited a maximum stress of 14.3 +/- 1.3 MPa and strain at break of 1390 +/- 66% from tensile tests. The stress strain curves of FIF-10 and 14 were analyzed by a statistical molecular approach using a nonaffine tube model to estimate the thermoplastic elastomer behavior. Dynamic mechanical analysis that the softening temperature of PBF in FIF was 145 degrees C, much higher than that of thermoplastic elastomers with polystyrene hard blocks. Microphase separation of FIF triblock copolymers was observed by small-angle X-ray scattering, even though long-range order was not achieved under the annealing conditions employed. In addition, the microphase separation of the resulting triblock copolymers was examined by atomic force microscopy.

• 出版日期2016-4-12