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- 2018
甘蔗渣的改性方法对甘蔗渣/聚乳酸复合材料结构与性能的影响
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Abstract:
采用碱处理、硅烷偶联剂及碱处理后再硅烷偶联剂等方法改性甘蔗渣（BF），将改性后的BF与聚乳酸（PLA）共混制备BF/PLA复合材料。采用TGA、FTIR和SEM分析研究BF/PLA复合材料的热稳定性；分别采用Flynn-Wall-Ozawa（FWO）法和Kissinger法研究BF/PLA复合材料的热分解动力学。结果表明，BF/PLA复合材料的热稳定与BF的结构及BF/PLA复合材料的界面相容性有关。碱处理使BF原纤化，降低BF的耐热性，不利于BF/PLA复合材料热稳定性及力学性能的提高；硅烷偶联剂改性可以改善BF与PLA的界面相容性，有助于提高BF/PLA复合材料的热稳定性。FWO法与Kissinger法计算得到的热分解活化能较一致，说明这两种方法都适合研究BF/PLA复合材料的热分解动力学。在所对比的BF/PLA复合体系中，硅烷偶联剂改性的BF/PLA复合材料热分解活化能最高、力学性能最佳，碱处理后再硅烷偶联剂改性的BF/PLA复合材料次之。 The measures in terms of alkali treatment, silane coupling agent modification and combination of alkali treatment and silane coupling agent modification were used to modify bagasse (BF). Various modified BF were blended with polylactic acid (PLA) to prepare BF/PLA composites. TGA, FTIR and SEM were used to study the thermal stability of BF/PLA composites. Flynn-Wall-Ozawa (FWO) method and Kissinger method were used to investigate the thermal decomposition kinetics of BF/PLA composites, respectively. The results show that the thermal stability of BF/PLA composites is associated with the structure of BF and the interfacial compatibility of BF/PLA composites. The alkali treatment makes BF fibrillated and reduces its heat resistance, as impedes the increasing of thermal stability and mechanical properties of BF/PLA composites. The silane coupling agent modification improves the interfacial compatibility between BF and PLA, resulting in the increasing of thermal stability of BF/PLA. In the compared BF/PLA composites, the silane coupling agent modification affords most contribution to the increasing of thermal degradation activation energy and mechanical properties of BF/PLA composites, while the combination of alkali treatment and silane coupling agent modification affords second contribution. 国家自然科学基金（51276044）；广东省科技计划项目（2014A010105047）；广州市科技计划项目（201707010367）
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