摘要
采用聚酯多元醇(PEA)和聚醚多元醇(PTMG)为混合软链段,考察了相同原料组成而不同制备方法对聚氨酯材料力学性能及动态行为的影响。方法一:将PEA和PTMG混合后制成预聚体,用扩链剂(MOCA)扩链后合成聚氨酯;方法二:将PEA和PTMG分别制成备预聚体,按照一定比例取出2种预聚体,再按各自的扩链系数加入MOCA,反应数分钟后将两者混合制备PEA/PTMG混合软链段聚氨酯。动态力学分析表明,不同制备方法对材料的耗能模量及玻璃化转变温度有较大影响,也证实了按照方法二制备的聚氨酯具有多微区结构。论文的研究模式对制备多种不同微区共存的聚氨酯是有益的。
Using polytetramethylene glycol （PTMG） and polyethylene glycol＇ adipate （PEA） as mixed soft segments, polyurethanes（PUs）were designed by different preparation methods. Dynamic mechanical analysis（DMA） was used to investigate the micro-phase separation of PUs. One method was that the prepolymer was prepared with the mixed polyols containing PEA and PTMG with some ratio, then 4,4＇-methylene-2-ortho-dichloroaniline（MOCA） was used as the chain extender, PUs were obtained. The second method was that the two kinds of prepolymers were prepared with PEA and PTMG respectively. MOCA was used to extend the two pre-polymers. After reacted for 3 min-6 min, the two parts were incorporated and molded to prepare PUs. The DMA test results show that loss modulus and glass transition temperature of PU are influenced by the preparation method to a large extent. The micro-structure of PUs can be influenced by preparation method.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第9期58-61,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(50273025)
关键词
聚氨酯
多微区
制备
动态力学性能
力学性能
polyurethane
multi-micro-domains
preparation
dynamic-mechanical properties
mechanical properties
