Construction of an epoxidized, phosphorus-based poly(styrene butadiene styrene) and its application in high-performance epoxy resin
Cheng Wang, Siqi Huo, Guofeng Ye, Bingtao Wang, Zhenghong Guo, Qi Zhang, Pingan Song, Hao Wang, Zhitian Liu
Abstract
In modern industries, the demand of multifunctional, transparent epoxy resin (EP) combining superior dielectric, mechanical, and fire-safety performances is gradually increasing. However, it was difficult to realize such a performance portfolio in current research. Herein, we fabricated an epoxidized, phosphaphenanthrene-containing poly(styrene butadiene styrene) (ESD) for advanced fire-safe EP. ESD maintains the high transparency of EP and improves the UV-blocking property. 10 wt% ESD makes EP/DDM/10ESD pass a limiting oxygen index (LOI) of 36.0 % and a UL-94 V-0 rating. EP/DDM/10ESD displays improved mechanical properties because of intramolecular cavities and rigid P-based groups in ESD, as reflected by 79.2 %, 68.9 %, and 67.6 % increases in impact strength, tensile strength, and fracture toughness (KIC) relative to EP/DDM. Compared with EP/DDM, EP/DDM/10ESD shows obviously-decreased dielectric constant and loss. EP/DDM/10ESD outperforms many fire-safe epoxy resins due to its superior comprehensive performances. Thus, this work delivers an effective method for developing multifunctional flame-retardant epoxy resin.