Titone Vincenzo, Correnti Antonio, La Mantia Francesco Paolo
Department of Engineering, University of Palermo, Viale delle Scienze, 90128 Palermo, Italy.
INSTM Consortium for Materials Science and Technology, Via Giusti 9, 50125 Florence, Italy.
Polymers (Basel). 2021 May 17;13(10):1616. doi: 10.3390/polym13101616.
This work is focused on the influence of moisture content on the processing and mechanical properties of a biodegradable polyester used for applications in injection molding. The pellets of the biodegradable polyester were exposed under different relative humidity conditions at a constant temperature before being compression molded. The compression-molded specimens were again placed under the above conditions before the mechanical testing. With all these samples, it is possible to determine the effect of moisture content on the processing and mechanical properties separately, as well as the combined effect of moisture content on the mechanical properties. The results obtained showed that the amount of absorbed water-both before processing and before mechanical testing-causes an increase in elongation at break and a slight reduction of the elastic modulus and tensile strength. These changes have been associated with possible hydrolytic degradation during the compression molding process and, in particular, with the plasticizing action of the moisture absorbed by the specimens.
这项工作聚焦于水分含量对一种用于注塑成型应用的可生物降解聚酯的加工性能和机械性能的影响。在压缩成型之前，将可生物降解聚酯的粒料在恒温下置于不同相对湿度条件下。压缩成型后的试样在进行机械测试之前再次置于上述条件下。对于所有这些样品，能够分别确定水分含量对加工性能和机械性能的影响，以及水分含量对机械性能的综合影响。所获得的结果表明，在加工前和机械测试前吸收的水量会导致断裂伸长率增加，弹性模量和拉伸强度略有降低。这些变化与压缩成型过程中可能的水解降解有关，特别是与试样吸收的水分的增塑作用有关。
