CAJ | 학술논문

以微晶纤维素(MCC)和淀粉(ST)两种天然多糖为填料,制备了共混型硬质和半硬质可降解聚氨酯泡沫塑料(PUF),利用材料试验机研究了其力学性能,通过土壤掩埋和需氧堆肥化两种手段研究了其降解性能.结果表明,MCC和ST可以以较大比例与聚氨酯进行共混,在硬质PUF(RPUF)中的质量分数可达23.3%,在半硬质PUF(SRPUF)中的质量分数可达20.0%;随着填料用量的增加,RPUF的压缩弹性模量和强度有一定提高,但冲击强度下降较大,SRPUJF在保持其断裂伸长率基本不变的同时其拉伸强度有一定提高;随着填料用量的增加或降解时间的延长,PUF的生物降解程度提高;ST填充试样的力学和生物降解性能优于MCC填充试样.
이미정섬유소(MCC)화정분(ST)량충천연다당위전료,제비료공혼형경질화반경질가강해취안지포말소료(PUF),이용재료시험궤연구료기역학성능,통과토양엄매화수양퇴비화량충수단연구료기강해성능.결과표명,MCC화ST가이이교대비례여취안지진행공혼,재경질PUF(RPUF)중적질량분수가체23.3%,재반경질PUF(SRPUF)중적질량분수가체20.0%;수착전료용량적증가,RPUF적압축탄성모량화강도유일정제고,단충격강도하강교대,SRPUJF재보지기단렬신장솔기본불변적동시기랍신강도유일정제고;수착전료용량적증가혹강해시간적연장,PUF적생물강해정도제고;ST전충시양적역학화생물강해성능우우MCC전충시양.
Blending type rigid and semi-rigid biodegradable polyurethane foams were prepared using microcrystal cellulose (MCC) and starch (ST) as filler. Mechanical performances of samples were characterized on universal material tester, and degrada-tion properties were investigated by soil burial tests and aerobic compost tests. The results showed that MCC and ST could be blended with polyurethane in a limited ratio. Maximum filling ratios were 23. 3% and 20. 0% for rigid polyurethane foam and semi-rigid polyu-rethane foam respectively. Compressive modulus and strength of filled rigid polyurethane foam could be improved at certain filling ratio, but impactive strength decreased obviously with increasing filling ratio. Tensile strength of filled semi-rigid polyurethane foam could be improved, and at the same time, elongation at break did not decrease. With increasing filling ratio of natural polysaccharide and degra-dation time, biodegradation extents of polyurethane foams were improved. Mechanical and degradation performances of polyurethane foams filled with ST were better than that filled with MCC.