含杂环聚芳醚腈酮的亲水改性  

HYDROPHILIC MODIFICATION OF POLY(PHTHALAZINONE ETHER NITRILE KETONE)S CONTAINING HETEROCYCLE MOIETY

作　　者：刘志勇[1] 王锦艳[1] 阎庆玲[1] 寇艳[1] 蹇锡高[1] 

机构地区：[1]大连理工大学化工学院高分子材料系

出　　处：《高分子学报》2006年第7期931-936,共6页Acta Polymerica Sinica

基　　金：国家高技术研究发展计划基金(基金号2003AA33g030)资助项目

摘　　要：为得到适合于耐高温水性涂料用的亲水性树脂,在碱性条件下对含有二氮杂萘酮结构的耐高温聚合物聚芳醚腈酮(PPENK)进行了亲水改性,选定不同反应时间的改性树脂HPPENKa(0.5 h)、HPPENKb(1.5 h)和HPPENKc(3.5 h),测定其玻璃化转变温度(Tg)、热失重温度、水接触角和溶解性,研究改性聚合物的性能变化.结果表明,随着反应时间的延长,氰基转化率提高,水解产物Tg增加,热失重温度有所降低,水解前后的溶解性能有很大变化,亲水性能明显增强,例如,当氰基转化率为93.82%时,HPPENK膜的水接触角达到54.4°,比PPENK膜的水接触角(75.3°)减小了20.9°.同时,甄选不同的反应共溶剂、反应温度以及碱浓度,考察其对反应的影响,结果表明,当反应温度为120℃6、mol/L NaOH溶液、以DMAc作为反应的共溶剂时对反应较为有利.制备了基于3种改性树脂的水分散体,其静置稳定性依次为HPPENKc>HPPENKb>HPPENKa,其中HPPENKc水分散体较稳定,30天内未出现沉淀.改性聚合物的结构经FT IR和1H-NMR表征.Poly（phthalazinone ether nitrile ketone）s （PPENK） modified via hydrolysis of cyano groups with NaOH was studied in order to find a hydrophilic resin applicable to heat-resistant waterborne coatings. The propeties of hydrolyzates, HPPENKa （0.5 h）, HPPENKb （1.5 h） and HPPENKc （3.5 h）, were measured by differential scanning calorimetry （ DSC）, thermogravimetric analysis （ TGA）, contact angle （water） and solubility. The results indicated that the nitrile conversion ratio and Tg of hydrolyzates increased whereas the weight loss ratio of HPPENK decreased as hydrolysis time was prolonged. As expected, the hydrophilicity of HPPENK was improved greatly, e. g. when CN conversion ratio was 93.82% ,the water contact angles was decreased from 75.3° of PPENK to 54.4° of HPPENK. By studying the effect of the reaction co-solvents, reaction temperature and NaOH concentration on hydrolysis,the optimal synthetic technology was found to be reaction at 120℃ with 6 mol/L NaOH solution and DMAc as co-solvent. Aqueous dispersions based on three modified resins were prepared and their storable stability were listed as follows ： HPPENKc 〉 HPPENKb 〉 HPPENKa. Especially, the deposition of HPPENKc dispersion was not found after more than 30 days. The structures of hydrolyzates were characterized by FTIR, 1H-NMR.

关 键 词：聚芳醚腈酮 亲水改性 水性涂料 

分 类 号：TQ630.4[化学工程—精细化工]