聚乳酸/蒙脱土纳米复合材料的微波辅助制备与性能研究

采用微波辐照酸活化法制备了酸性蒙脱土(H-MMT),并采用BET、NH3-TPD、热重等分析手段对其结构和性质进行表征。结果表明,改性后蒙脱土的比表面积和孔径增大,表面出现超强酸点位,热力学稳定性增强。将H-MMT与SnCl2进行复配后用于微波辅助原位熔融缩聚制备聚乳酸/蒙脱土(PLA/MMT)纳米复合材料,结果表明,H-MMT同时具备了较好的酸催化及纳米增强作用,以剥离形态存在于高分子基体中,PLA/MMT纳米复合材料的力学、热力学性能得到显著提升。

Preparation and Characterization of PLA/MMT Nanocomposites with Microwave Irradiation

Acidic montmorillonite(H-MMT) was managed to be prepared by treating Na-montmorillonite with H2SO4 under microwave irradiation.The structure and characters of the H-MMT were studied by BET,NH3-TPD and DTA/TG techniques.The results revealed that H-MMT had greater surface area and pore volume,the super acid sites were formed on its surface and the thermal stability was improved.After that,PLA/MMT nanocomposite was synthesized by in situ melt polycondensation under microwave irradiation with H-MMT compounded with SnCl2 as catalyst and nanometer additives.The results showed that H-MMT existed in an exfoliated form in the polymer matrix and had good catalytic effects on elevating the molecular weight of the PLA based nanocomposite,and the mechanical and thermal properties of PLA/MMT nanocomposite were improved.