摘要
采用异步合成法制备了聚甲基丙烯酸甲酯(PMMA)、聚苯乙烯(PST)、聚丙烯腈(PAN)与氰酸酯(CE)的共聚物,比较了3种热塑性树脂对共聚物力学性能、玻璃化温度(Tg)、转化率及反应活化能的影响,并讨论了共聚物的相图变化、微观结构与宏观性能之间的联系以及催化剂对改性体系相结构的影响。结果表明,当加入质量分数为15%的PMMA时,改性体系的冲击强度和弯曲强度比纯氰酸酯树脂分别提高了94.99%和29.90%,玻璃化温度提高了约30℃。改性体系经150℃固化,转化率可提高90%以上。改性体系的相结构随PMMA含量增加依次出现分散相、双连续相和相反转结构,在临界点(m(PMMA)=15%)附近可形成双连续相结构。相尺寸和相间距随固化温度升高而加大。共聚物中热塑性树脂的含量和共聚物的固化工艺对共聚物的相结构有较大影响,通过相结构的转变,进而影响到共聚物性能,拓展了其应用范围。
Copolymers PMMA/CE, PST/CE and PAN/CE were prepared by means of asynchronous synthesis. The effects of adding three kinds of thermoplastic resin on the mechanical properties（Tg ）, conversion and the reaction activation were studied. The phase diagram was analyzed. The relation between the microstructure and the macroscopical properties of the copolymers and the effect of the catalyst on the phase structures of the composites were discussed. The impact and flexural strength were increased 94.99% and 29.90% respectively when 15% （wt）PMMA was added and the glass transition temperature was increased 30 ℃ .The conversion was increased 90% after cured at 150 ℃. Dispersed phase , bicontinuous phase and phase inversion structure appeared as content of PMMA increasing. The bicontinuous phase structure would be formed at critical point（m （PMMA） = 15% ）. The phase size and phase spacing were increasing as curing temperature increasing. The content of thermoplastic resin and the curing behavior of copolymers had great effect on phase structure swinging. The properties of copolymers were in fluenced by phase structural changing, thus they were used more widely.
出处
《热固性树脂》
CAS
CSCD
2008年第3期19-24,28,共7页
Thermosetting Resin
基金
陕西省教育厅专项科研计划项目资助(06JK303)
关键词
热塑性树脂
氰酸酯树脂
共聚物
相结构
性能表征
cyanate resin
thermoplastic resin
copolymer
phase structure
property characterization
