Triblock polyarylene polyether with polysiloxane segment and imp

Details Triblock polyarylene polyether with polysiloxane segment and imp Triblock polyarylene polyether with polysiloxane segment and imp

1987-10-22

1989-10-03

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525391, 525474, 525479, 528 15, 528 25, 528 31, C08G 6548

Patent

active

048718165

ABSTRACT:
Polyarylene polyethers ("PAPE") with vinyl chain ends may be crosslinked to form networks with excellent physical and chemical properties except they tend to be brittle. In particular, a polysulfone ("PSU" made from bisphenol A and dichlorodiphenyl sulfone) with vinylbenzyl chain ends ("di-VB-PSU") is too brittle for many applications where impact resistance is essential. This brittleness is combatted by inserting a thermally stable rubbery poly(dimethylsiloxane) ("PDMS") segment having a number average molecular weight in the range from about 600 to about 5000 connected to di-VB-PSU segments by hydrosilylation in the presence of a Pt catalyst, to form a thermoplastic linear predominantly triblock oligomer with vinylbenzyl chain ends which are thermally crosslinkable. When crosslinked, the network formed has improved impact resistance and toughness, with only a little loss in the upper glass transition temperature if the relative lengths of the PDMS and PAPE are such as to provide the desired degree of phase microincompatibility sufficient to improve toughness. The triblock may be blended with a polymer with which the triblock may be crosslinked upon curing. If the VB-PSU-PDMS-PSU-VB triblock is blended with di-VB-PSU the polyblend may be crosslinked to provide improved toughness.

REFERENCES:
patent: 3668273 (1972-06-01), Krantz
patent: 3960985 (1976-06-01), Cooper
patent: 4634742 (1987-01-01), Percec
patent: 4663402 (1987-05-01), Percec et al.
patent: 4701514 (1987-10-01), Percec

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