Novel synthesis of polyimide–polyhybridsiloxane block copolymers via polyhydrosilylation: Characterization and physical properties

Abstract

The insertion of soft polysiloxane segments into a polyimide backbone introduces changes in its properties (processability, low surface tension, gas permeability, and lower dielectric constant). Generally, these polyimide–polysiloxane copolymers are synthesized by the condensation of a dianhydride with an aromatic diamine and an amine telechelic polysiloxane, or by transimidization between an aminopyridine‐terminated oligoimide and an amine end‐capped oligosiloxane. This study investigated another route to obtain perfectly alternating polyimide–polyhybridsiloxane (PI–PHSX) block copolymers. The hydrosilylation, widely studied previously, was performed to elaborate copolymers from an allyl telechelic polyimide and a hydrosilane telechelic polyhybridsiloxane. The use of a telechelic polyhybridsiloxane as a soft segment brought better thermostability and better chemical resistance in comparison with an oligosiloxane based on Si(CH3)2O units. Using the same allyl telechelic polyimide moiety but varying the size of the hybrid siloxane part, we obtained different PI–PHSX block copolymers, leading to thermoplastic elastomers (TPE). We investigated the effect of the soft‐segment length on the thermal resistance, activation energy of thermal degradation, mechanical behavior, and surface properties of a series three PI–PHSX block copolymers containing 36, 54, and 75 wt % polyimide. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 2414–2425, 2001

A Straightforward Synthesis and Characterization of a New Poly(imide siloxane)-based Thermoplastic Elastomer

“…They used allyl group telechelic PI moiety and various size of hydrosilane telechelic polyhybridsiloxane, through hydrosilylation reaction, to prepare a series of PIS alternating block copolymers containing 36, 54 and 75 wt % of PI. 18 The resulting PIS copolymers exhibited good performances in terms of both thermomechanical and chemical properties.…”

“…Andre et al [18][19][20][21][22] reported a series of studies about fluorinated TPE. They used allyl group telechelic PI moiety and various size of hydrosilane telechelic polyhybridsiloxane, through hydrosilylation reaction, to prepare a series of PIS alternating block copolymers containing 36, 54 and 75 wt % of PI.…”

SiO2 Reinforcement and Morphology of a Novel Poly(imide-siloxane)-Based Thermal Plastic Elastomer Composite

“…[7][8][9][10][11] However, rubber properties had not been emphasized in these reports. Andre et al [7][8][9][10] reported a series of studies about fluorinated polysiloxane type TPE. They used allyl group telechelic PI moiety and various sized hydrosilane telechelic polyhybridsiloxane, through hydrosilylation reaction, to prepare a series of PI/polysiloxane alternating block copolymer TPE.…”

“…However, the numbers of polysiloxane type TPEs discovered and studied has been limited. [6][7][8][9][10][11] Kajiyama et al 6 reported the synthesis of copolymers based on poly(dimethylsiloxane) (PDMS) and N-phenylated polyureas (the hard segment). In their study, the oligomer of ,!-bis(3-aminopropyl) polydimethylsiloxane (APPS, number-average molecular weight M n ¼ 1720 and 2740 gÁmol À1 ) and , 0 -dianilino-p-xylene (DAX) were used to react with 4,4 0 -methylenebis (phenyl isocyanate) (MBI) by the addition solution polymerization to synthesize multiblock copolymers.…”

“…The PI content was 36, 54 and 75 wt %. 7 Alternatively, they used the oligomers of ,!-diallylfluorinated PI and ,!-dihydrosilane fluorinated-polyhybridsiloxane to synthesize a series of alternating fluorinated PI/fluorinated polyhybridsiloxanes block copolymers. 9 In another report, 10 they used ,!-dichlorosilane fluorinated PI and ,!-disilanol polyhybridsiloxanes to synthesize another series of fluorinated PI/ fluorinated polyhybridsiloxane block copolymers through a two-step polycondensation reaction.…”