Silicon-containing poly(diethynylbenzene-dipropargyl ether of bisphenol A)s：copolymerization, properties and their composites

Abstract

Dipropargyl ether of bisphenol A (DPEBA) was used to copolymerize with 1, 3-diethynylbenzen (m-DEB) through dimethylsilane linkage in one-pot way to obtain the silicon-containing poly(diethynylbenzene-co-dipropargyl ether of bisphenol A)s (PSAPEs) by Grignard reagents. The reactivity of alkynyl hydrogens in DPEBA and m-DEB were calculated. The reactivity of DPEBA and m-DEB are so similar that they can easily copolymerize with each other to obtain a random copolymer. The content of copolymer segments in the copolymer is larger than that of homopolymer segments in the copolymer when the molar ration of DPEBA in the comonomer composition is less than 50%. With increase of DPEBA content in comonomer composition, the meltability of PSAPEs can be improved, but the curing temperature of PSAPEs increase, and the thermal stability of the cured PSAPEs decrease clearly. The flexural and interlaminar shear strength of the T300 carbon cloth reinforced PSAPEs composites (T300CF/PSAPEs) increase with incorporation of DPEBA in the copolymer matrix. The glass transition temperature of the composites can be over 400 °C. A T300CF/PSAPE-70 composite with 70% of DPEBA as comonomer of the matrix resin displays the flexural strength of 374 MPa at room temperature, and can retain over 88% at 300 °C in 30 min.