前原位聚合法改性乙烯基酯树脂的研究

Modification of Vinyl Ester Cured Resin by Pre-in Situ Polymerization

提出前原位聚合聚酰亚胺齐聚物改性VE树脂的新方法.以与VE树脂发生反应且中、低温条件下惰性的单体为溶剂,就地合成了活性端基醚酰亚胺齐聚物,然后将VE树脂与含有活性端基醚酰亚胺的共聚单体共混、共聚,得到改性VE树脂(PE I/VE/RS)体系;研究了体系的反应性和固化物及复合材料的力学性能、阻燃性,并以扫描电镜为手段,对固化树脂的断口形貌进行了分析.结果表明:固化树脂宏观上呈透明状,微观上为均相结构,PE I作为增强相在接近分子水平上均匀分散在VE树脂中,正是由于这种相结构的存在,导致改性VE树脂(PE I/VE/RS)体系具有良好的力学性能和阻燃性,其弯曲强度为102.7M Pa,冲击强度为16.8 kJ/m2,玻璃化转变温度为134℃,极限氧指数为25.7.PE I/RS/VE树脂基复合材料的弯曲强度为311.6 M Pa,冲击强度为106.9 kJ/m2,极限氧指数为29.7.

It was succeed in producing a tougher and more flame retardant vifiyl ester cured resin via prein situ polymerization technology and its matrix glass farbic composites material. Tougher and more flame retardant vinyl ester resin was consists of three parts： vinyl ester resin （VE）, copolymerization monomer （RS） with VE, and polyimide oligmer （PEI）. RS was used as solvent for PEI synthesizing and did not need to separate the PEI/RS mixture. Then VE was dissolved in PEI/RS mixture to obtain homogenous PEI/RS /VE system, which was pre-in situ polymerization technology. The final step was that PEI/RS/VE system was cured to obtain tougher and more flame retardant VE cured resin. PEI/ RS/VE system was employed as matrix to manufacture glass fabric composites material. It was studied that the reaction of system, the mechanical properties PEI/RS/VE cured resin and PEI/RS/VE matrix glass fabric composites material. The morphological of fracture P EI/RS/VE cured resin was observed by SEM. The result showed that PEI/RS/VE cured resin presented transparent and had homogeneous structure in microstructure. This lead to PEI/RS/VE cured resin has excellent properties. （1） Flexural strength is 102.7 MPa, （2） impact strength is 16.8 kJ/m2, （3） LOI is 25.7, （4） glass transformation temperature is 134 ℃. （5）Flexural strength of PEI/RS/VE resin matrix glass fabric composite material is 311.6 MPa, （6） impact strength is 106.9 kJ/m^2, （7） LOI is 29.7.