双官能团POSS对苯并噁嗪树脂主链的纳米杂化及性能研究

Polybenzoxazine (PB) resins, as a new type of phenol-formaldehyde resin, has much important application in the fields of electronics, aerospace, etc. However, the present PB resins suffer from the problems of poor transparency, poor toughness and low thermal resistance. Polyhedral oligomeric silsesquioxanes (POSS) and their derivatives such as monofunctional and multi-functional POSS, can be introduced uniformly into polymers in the form of terminal groups or cross-linkers and improve the properties of PB resins. But monofunctional and multi-functional POSS cannot modify the chains structures and entire properties of resins. In this project, the molecular structures of bifunctional POSS is designed and embedded into the polymer main chains to modify the mains chains structures and cross-linking density, achieving high performance PB resins with high transparency, toughness and thermal resistance. Specially, bifunctional POSS serve as the organic framework of benzoxazine monomers, combining polydimethylsiloxane (soft segment) and bisphenol A (hard segment). Based on the ring opening polymerization, POSS modified benzoxazine monomers polymerized into single or multiple components PB resins composites through controlling the types and proportion of different monomers. The effect of molecular structures and microscale phase structures of benzoxazines and POSS will be studied in detailed for further improving the desired properties of PB resins.

苯并噁嗪树脂作为一种新型的酚醛树脂，在电子电器和航空航天等领域具有重要的应用前景。然而仍存在透明性低、韧性差，以及耐热性和力学性能不足等问题。聚倍半硅氧烷（POSS）及其衍生物，如单官能团和多官能团POSS，可以分子链端基或交联结点形式引入可引入树脂基体中，能够改善苯并噁嗪树脂部分性能，但在调控高分子链结构和提升树脂整体性能方面依然存在明显不足。本项目以双官能团POSS的分子设计为基础，将其嵌入高分子主链中，调节主链结构和树脂交联密度，从而改善树脂的耐热性、透明性以及韧性等性能。以POSS作为苯并噁嗪单体的无机骨架，以聚二甲基硅氧烷和双酚A作为柔性和刚性有机骨架，通过调节单体的种类和比例，制备单组份和多组分苯并噁嗪树脂，研究并揭示苯并噁嗪单体和POSS分子结构以及微观相结构等因素影响树脂性能的机制，从而改善苯并噁嗪树脂的目标性能。

苯并噁嗪树脂存在耐热性不足等问题。聚倍半硅氧烷（POSS）及其衍生物可以通过分子链端基或交联结点形式引入到树脂基体中，改善苯并噁嗪树脂的部分性能。但在, 目前研究在提升树脂整体热性能方面依然存在不足。本项目以POSS作为苯并噁嗪单体的无机骨架，通过调节单体的种类和比例，制备单组份和多组分苯并噁嗪树脂，研究并揭示苯并噁嗪单体和POSS分子结构以及微观相结构等因素影响树脂性能的机制，从而改善苯并噁嗪树脂的热稳定性能。在研究过程中，我们合成了多种功能化苯并噁嗪基聚合物，这些聚合物在热固化后表现出良好的热稳定性能。在此基础上，我们探讨了苯并噁嗪基聚合物复合材料的在电学、光学和气体吸附等领域的潜在应用。基本完成项目研究计划。