Vinyl-terminated butadiene acrylonitrile improves the toughness, processing window, and thermal stability of bismaleimide resin. (December 2017)

• Record Type: Journal Article
• Authors: Wang, Dezhi; Wang, Xin; Liu, Lizhu; Qu, Chunyan; Liu, Changwei; Yang, Haidong
• Is Part Of: High performance polymers. Volume 29:Number 10(2017)
• Page Start: 1199
• Page End: 1208
• Publication Date: 2017-12
• Subjects: BMI resin -- high toughness -- rheological properties -- high thermal stability; Polymerization -- Periodicals; Polymers -- Periodicals; 547.7
• DOI: 10.1177/0954008316673418
• Languages: English
• ISSNs: 0954-0083

Abstract

Structural materials with excellent toughness, a wide processing window, outstanding mechanical performance, and high thermal stability are highly desired in engineering. This work reports a novel bismaleimide (BMI) resin system fabricated using bis[4-(4-maleimidephen-oxy)phenyl)]propane (BMPP), 1-(2-methyl-5-(2, 5-dioxo-2H-pyrrol-1(5 H)-yl) phenyl)-1H-pyrrole-2, 5-dione (BTM), and diallyl bisphenol A (DABPA) by a melt method. The behaviors of the BTM/BMPP/DABPA resin were modified by adding vinyl-terminated butadiene acrylonitrile (VTBN) in various amounts. The cured BTM/BMPP/DABPA/VTBN resin system exhibited all of the abovementioned desirable properties. Excellent performance was achieved by the post-cured BMI resin containing 6 phr of VTBN (VTBN-6). The glass transition temperature ( T g ) and the 5% weight loss temperature of VTBN-6 were 278°C and 408°C, respectively. Relative to VTBN-0 (BMI resin without VTBN), the impact strength of cured VTBN-6 (12.32 KJ/m 2 ) improved by 45.6%, and the fracture toughness values, K IC and G IC, increased by 48.7% and 26%, respectively. Moreover, the prepolymer of VTBN-6 exhibited low viscosity over a wide temperature range (70–200°C) under dynamic conditions and for an extended time (70 min; 75% improvement over VTBN-0) in an isothermal test. These results confirm the wide processing window of VTBN-6. The high toughness of the VTBN-containing BMI resin was compatible with other excellent performances of the modified resin.