Add time:08/21/2019         Source:sciencedirect.com

Thermally crosslinkable oligomers of aromatic poly(ether sulphone) (PSU) with incorporated poly(dimethylsiloxane) (PDMS) segments were produced via Pt-catalysed hydrosilylation of α,ω-di(silane)PDMS with α,ω-di(vinylbenzyl)PSU. A 21 molar ratio of PSU to PDMS was used to obtain statistically a ‘triblock’ copolymer with on average one PDMS segment incorporated between two PSU segments. Nuclear magnetic resonance analysis of prepared ‘triblocks’ revealed that the reaction could be performed without detectable side reactions of the hydrosilane end groups of the PDMS. Thermal characterization of the ‘triblocks’ showed the thermal transitions of both segments, both before and after curing, to be highly dependent on the molecular weight of the component segments, good phase separation being realized at relatively low molecular weights, ∼ 3000 for both segments. Manipulation of the thermal transitions of both segments especially after cure was shown to be possible through proper choice of precursor molecular weights, or by blending of prepared ‘triblocks’ with varying amounts of homo-α,ω-di(vinylbenzyl)PSU. By these methods, it was possible to obtain cured PSU-PDMS-PSU ‘triblocks’ with PSU hard segment Tg values near to 200°C and low-temperature PDMS Tg values at about − 120°C. Dynamic-mechanical/rheological studies were also performed on these ‘triblocks’, and this is the subject of the following paper.

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