固化温度对聚酰胺酰亚胺涂层的结构及热稳定性的影响  

Effect of Curing Temperature on Structure and Thermal Stability of Polyamide-Imide Coatings

作　　者：李莉[1] 齐育红[1] 张岩[1] 巴淼 郭贺洁[1] 奚江涛 张占平[1] 

机构地区：[1]大连海事大学材料科学与工程系,辽宁大连116026

出　　处：《高分子材料科学与工程》2015年第8期79-83,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51179018;51079011);交通运输部应用基础研究(2013329225330);中央高校基本科研业务费之大连海事大学创新团队计划(3132014323)

摘　　要：通过对由偏苯三酸酐和4,4-二苯甲烷二异氰酸酯合成的聚酰胺酰亚胺（PAI）在不同温度固化成膜试样的热溶解、红外及热重分析试验研究,结果表明,200℃以下固化时,分子链段较短,主要依靠链段间的氢键作用固化成膜,膜的脆性大,热稳定性差;200-300℃之间固化时,发生分子链增长,依靠氢键作用和分子链缠绕固化成膜,随温度升高有少量的交联现象,PAI膜有较好的柔性和热稳定性;300℃以上固化,主要依靠链段间氧化交联成膜,膜的刚性增加,柔性降低。综合比较,250℃固化的膜,分子链间约有11%的交联,具有较好的柔韧性和热稳定性,质量损失10%时温度高达545℃,800℃时质量损失最少为25.5%。Polyamide-imide（ PAI） synthesized with trimellitic anhydride and 4,4-diphenyl methane diisocyanate was cured at 100 - 400 ℃. Structure and thermal stability of the coatings were investigated by thermal dissolution testing,infrared analysis and thermal gravimetric analysis. It is found that the coating cured below 200 ℃ is brittle and poor stability; the coating cured at 200 - 300 ℃ shows good flexibility and good thermal stability. While the coating cured beyond 300 ℃ possesses poor flexibility. The coating cured at 250 ℃ has the most flexibility and thermal stability compared to at other temperature. The results show that the PAI coating curing mechanism is related to curing temperature.The coating curing below 200 ℃ depends on hydrogen bonding effects among short molecular chains,curing at 200 -300 ℃ depends on hydrogen bonding and little crosslink among long molecular chains,while curing beyond 300 ℃mainly depends on crosslink among short molecular chains.

关 键 词：聚酰胺酰亚胺 固化 结构 热稳定性 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]