New Fluorinated Thermoplastic Elastomers, 4

Abstract

AbstractSummary: The synthesis of fluorinated polyimide‐polyhybridsiloxane block copolymers (FPI‐HPHSX) was performed by polycondensation of α,ω‐dichlorosilane fluorinated polyimides (SiCl‐FPI) and α,ω‐disilanol‐polyhybridsiloxanes (SiOH‐HPHSX). The α,ω‐disilanol polyhybridsiloxanes were synthesized by polyhydrosilylation between 1,7‐octadiene and hexamethyltrisiloxane (HMTS). The resulting siloxanes exhibit a glass transition temperature close to −98 °C. The α,ω‐dichlorosilane fluorinated polyimide was prepared by hydrosilylation of α,ω‐diallyl fluorinated polyimide and dimethylchlorosilane in the presence of Karstedt's catalyst. Then a series of four FPI‐HPHSX was synthesized by polycondensation and, with tuning of the number average molecular weight ($\overline M _{\rm n}$) of the soft polyhybridsiloxane and the hard polyimide groups, they were characterized. The influence of the segment lengths on the behavior (surface tension and thermal stability) of the thermoplastic elastomer (TPE) material was studied. The FPI‐HPHSX block copolymers' thermomechanical properties are also reported and discussed.General procedure for the synthesis of alternating block copolymers FPI‐HPHSX by polycondensation.magnified imageGeneral procedure for the synthesis of alternating block copolymers FPI‐HPHSX by polycondensation.