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采用微生物水性培养液降解实验法对聚对二氧环己酮/有机蒙脱土(PPDO/OMMT)纳米复合材料的生物降解性能进行了研究.通过质量、特性黏数、pH、热分析和电子扫描显微镜(SEM)研究了试样的降解过程.结果表明,在本实验条件下,PPDO/OMMT纳米复合材料降解性随着OMMT含量的增加而增加.降解90天,在微生物水性培养液中PPDO和含有5%OMMT的纳米复合材料的质量损失率分别为17.9%和28.4%,而在无菌培养液中它们的质量损失率分别为12.9%和18.0%.在微生物培养液中PPDO和PPDO/OMMT的特性黏数都随着降解时间的延长而下降,并且在30天内特性黏数下降的幅度最大.研究表明PPDO和PPDO/OMMT降解过程中水解占主导作用,而微生物产生的酶对降解有促进作用;降解优先发生在非晶区,结晶度随之增加,随后结晶区被降解,结晶度下降;降解后的试样表面有明显被微生物侵蚀的痕迹.
The biodegradability of polydioxanone / montmorillonite (PPDO / OMMT) nanocomposites was studied by means of aqueous microbial degradation experiment.According to mass, intrinsic viscosity, pH, thermal analysis and electron The degradation process of PPDO / OMMT nanocomposites under the experimental conditions was investigated by scanning electron microscopy (SEM). The results showed that the degradability of PPDO / OMMT nanocomposites increased with the increase of OMMT content. After 90 days of degradation, PPDO And 5% OMMT nanocomposites were 17.9% and 28.4%, respectively, whereas their mass loss rates in sterile medium were 12.9% and 18.0%, respectively.Compared with PPDO and PPDO / The intrinsic viscosity of OMMT decreased with the extension of degradation time, and the intrinsic viscosity decreased most in 30 days.The results showed that hydrolysis of PPDO and PPDO / OMMT played a leading role, and the degradation of microorganisms Promote the role; Degradation preferentially occurred in the amorphous region, the degree of crystallinity increases, followed by degradation of the crystalline region, crystallinity decreased; Degraded sample surface was significantly traces of microbial erosion.