摘要
用二羟甲基丙酸对异氰酸酯封端的有机硅改性的聚氨酯预聚体进行扩链,得到异氰酸酯封端的有机硅改性的含羧基的聚氨酯齐聚物。以此齐聚物作为增韧剂接枝改性环氧树脂,用3,3′-二氯-4,4′-二氨基二苯甲烷(MOCA)进行固化,得到了聚氨酯(PU)环/氧树脂(EP)互穿聚合物网络(IPN)。用FTIR和SEM测试技术研究了IPN形成的动力学和微相分离行为;用动态力学分析(DMA)考察了不同配比下IPN的力学性能;用TGA研究了材料的热稳定性。结果表明,当PU齐聚物的质量分数为25%时,所生成材料的抗冲强度为23.58 kg/m2,玻璃态模量为1×103MPa,比纯环氧树脂的相应值分别提高了116.7%和近100%;而5%的质量热损失温度(362℃)几乎保持不变。
Dimethylopropionic acid（DMPA） was used as a chain extender to extend the isocyanate-terminated PDMS-modified polyurethane prepolymer, and isoeyanate-terminated PDMS-modified polyurethane oligomers containing earhoxyl groups were obtained. Then a novel type of PU/EP IPN was prepared by the reaction of the oligomers with the epoxy resin monomers（ E-51 ）, which was cured by 3,3＇-diehloro-4,4＇-diaminodiphenyl methane （MOCA）. The kinetics of the IPN formation and the mierophase separation were analyzed by means of FTIR and SEM. The meehnieal properties of the IPN with different PU/EP ratios were investigated by DMA. The thermal stability was also studied by TGA. The experimental results showed that when the amount of PU oligomer was 25 % （ mass fraction）, the impact strength and modulus of the resulted material in glassy state were 23.58 kg/m^2 and 10^3 MPa, respectively. Compared with that of the control epoxy resin, the impact strength of the resulted material increased by 116.7%, and the modulus increased almost by 100% ; while the 5% weight loss temperature remained almost the same, the synergism of IPN occurred, and accordingly the composite material obtained exhibited excellent eompositive properties.
出处
《应用化学》
CAS
CSCD
北大核心
2006年第4期409-413,共5页
Chinese Journal of Applied Chemistry
基金
上海市重点学科项目(P1402)
上海市教委青年基金(03FQ23)项目
