摘要
以PAPI和聚醚多元醇为原料,合成并表征了麦秸-回收塑料(LDPE)复合材料用界面偶联剂──端异氰酸酯聚氨酯预聚物PU1和PU2,研究了偶联剂的原料配比、合成步骤、结构性能与复合材料性能之间的关系。FT-IR光谱证实,PAPI与聚醚多元醇反应生成了氨基甲酸酯,生成物分子组成中含游离的异氰酸酯基;GPC分析表明,PU1和PU2数均相对分子质量(Mn)为4370和7230,分布指数为2.1和2.3;DSC分析表明,PU1和PU2的Tg分别为-65.5和-41.2℃;与未使用偶联剂的麦秸-回收LDPE复合材料相比较,2.5%的PU1和PU2偶联的相应材料,物理以及力学性能指标显著提高,偶联效果PU1优于PU2,PU1对应材料的性能指标超过GB/T4897.7-2003规定的在潮湿状态下使用的增强结构用板要求。
The new interfacial coupling agents, namely polyurethane prepolymer of isocyanate end group （ PU ） for wheat straw- recycled low density polyethylene（LDPE） composites were synthesized utilizing PAPI and polyether polyols as raw materials. The structure and characteristics of the coupling agents were analyzed by FT-IR spectroscopy, GPC and DSC. The relationship between material ratio and physical and mechanical properties of the prepared composites were evaluated. The results show that urethane is the reacting product and the existence of free isocyanate end group （ -NCO ） of PU, number-average molecular weights （ Mn ） of PU1 and PU2 are 4 370 and 7 230, distrbution indexs are 2.1 and 2.3, Tg are - 65.5 and - 41.2℃, respectively. Compared with the composite without coupling agents,the physical and mechanical properties of the composites using PU1 and PU2 are improved significantly,while effect of PU1 is superior to PU2. With 2.5 % PU1 coupling agent,the physical and mechanical properties of the composite exceed the standard GB/T 4897.6 - 2003 used for heavy-duty load-bearing beards in humid conditions.
出处
《林产化学与工业》
EI
CAS
CSCD
2007年第1期67-71,共5页
Chemistry and Industry of Forest Products
基金
国家948项目基金资助(2001-33)
关键词
聚氨酯预聚物
偶联剂
麦秸-回收LDPE复合材料
物理和力学性能
polyurethane prepolymer
coupling agents
wheat straw-recycled LDPE composites
physical and mechanical properties
