College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China.
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China.
Int J Biol Macromol. 2021 Jul 1;182:2108-2116. doi: 10.1016/j.ijbiomac.2021.05.207. Epub 2021 Jun 1.
To improve the performance of wheat straw/polylactic acid (WS/PLA) composites, four different silane coupling agents were used for constructing compatible interfaces and then examined by scanning electron microscopy, Fourier transform-infrared spectroscopy, X-ray diffractometry and thermogravimetric analysis. The blending and tensile strengths of silane-modified composites were effectively enhanced, with KH-570-modified composite exhibiting the best blending and tensile strengths. Water resistance analysis of silane-modified composites was reduced and contact angles larger, indicating that water resistance performance of this composite had been effectively improved. The KH-570-modified composite exhibited the best water resistance performance. Strain scanning showed that, in the linear viscoelastic region, the storage modulus (G') of modified composite was larger than that of unmodified composites. Frequency scanning showed that the G' and complex viscosity (η*) of modified composites were greater than those of unmodified composites. From strain analysis and frequency scanning, the modified performance of the silane agent was observed to effectively improve composite interfacial compatibility, with KH-570-modified composite exhibiting the best effect. XRD analysis showed that silane coupling agent modification improved the crystallinity of composites with the improvement of KH-570 the best. And the thermal stability of silane-modified composites was improved and the thermal stability of KH-570-modified composite the best.
为了提高麦秸/聚乳酸（WS/PLA）复合材料的性能，使用了四种不同的硅烷偶联剂来构建相容界面，并通过扫描电子显微镜、傅里叶变换红外光谱、X 射线衍射和热重分析进行了研究。硅烷改性复合材料的共混和拉伸强度得到了有效提高，其中 KH-570 改性复合材料的共混和拉伸强度最高。硅烷改性复合材料的耐水性分析得到了降低，接触角增大，表明复合材料的耐水性得到了有效提高。KH-570 改性复合材料具有最佳的耐水性。应变扫描表明，在线性粘弹区，改性复合材料的储能模量（G'）大于未改性复合材料。频率扫描表明，改性复合材料的 G'和复合粘度（η*）大于未改性复合材料。从应变分析和频率扫描来看，硅烷偶联剂的改性性能有效地提高了复合材料的界面相容性，其中 KH-570 改性复合材料的效果最好。XRD 分析表明，硅烷偶联剂的修饰提高了复合材料的结晶度，其中 KH-570 的修饰效果最好。而且，硅烷改性复合材料的热稳定性得到了提高，其中 KH-570 改性复合材料的热稳定性最好。
