A Novel Hyperbranched Polysiloxane Containing Epoxy and Phosphaphenanthrene Groups and its Multi-Functional Modification of Cyanate Ester Resin

作者：Zhang, Zhiyong; Gu, Aijuan; Liang, Guozheng^*; Yuan, Li; Zhuo, Dongxian

来源：Soft Materials, 2013, 11(3): 346-352.

DOI：10.1080/1539445X.2012.658941

• Cyanate ester
• Hyperbranched polysiloxane
• Mechanical property
• Multi-functional flame retardant
• Phosphaphenanthrene

A novel hyperbranched polysiloxane containing epoxy and phosphaphenanthrene groups (EP-HPSi) was synthesized through a ring-open reaction between P-H bond of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and epoxy group of a hyperbranched polysiloxane. EP-HPSi was used to modify cyanate ester (CE) resin. The influences of the content of EP-HPSi in modified CE resin system as well as the molar ratio between DOPO and epoxy group on the structure and integrated performance of the EP-HPSi/CE system were systematically studied. Results show that EP-HPSi is a multi-functional flame retardant, which endows CE resin with not only outstanding flame retardancy, but also significantly increased toughness and stiffness. For example, EP-HPSi/CE system has a 40-80(o)C lower curing temperature than CE; moreover, the impact and flexural strengths of EP-HPSi/CE system are about 1.6-2.2 and 1.3 times higher than that of CE resin, respectively. These attractive integrated performances of EP-HPSi/CE system are attributed to the special structure of EP-HPSi, and its influence on the cross-linked network. This investigation suggests that the method proposed herein is a new approach to develop high performance flame retardant resins for cutting-edge industries, especially those that simultaneously have outstanding thermal resistance, toughness, and stiffness. [Supplementary materials are available for this article. Go to the Publisher's online edition of Soft Materials for the following free supplemental resource: Figure S1]

• 出版日期2013-7-1
• 单位苏州大学