不同结构颗粒对PMMA基复合材料性能影响

采用原位本体聚合法制备PMMA/MCM-41(with template),PMMA/SBA-15(with template),PMMA/SiO2三种复合材料.研究了介孔分子筛MCM-41,SBA-15和SiO2对PMMA复合材料拉伸强度,冲击强度,热稳定性的影响.由于合成介孔分子筛MCM-41,SBA-15时所用的模板剂CTAB和P123分布于孔口处和颗粒表面上,分别与PMMA基体产生物理缠结作用,增加了两者的相容性;且P123(EO20PO70EO20)表面有较大的PO/EO比率,与小分子量的CTAB相比有较强的疏水性,使得PMMA/SBA-15(with template)复合材料的性能要优于PMMA/MCM-41(with template).

Influence of Different Structural Particle on the Properties of PMMA Composites

PMMA/MCM-41 (with template), PMMA/SBA-15 (with template), PMMA/SiO₂ composites were prepared by in situ polymerization. The effect of mesoporous molecular sieves MCM-41, SBA-15 and SiO₂ on the mechanical properties and the thermal stability of PMMA composite were investigated. The thermal stability of PMMA/MCM-41 (with template) and PMMA/SBA-15 (with template) were greatly enhanced as compared with PMMA. The impact properties of PMMA/SBA-15 (with template) composite were improved by 68.2% compared with PMMA at the 1.2% low filler loading. The CTAB and P₁₂₃ template in the mesopores or on the outer surface of the particle could provide physical entanglement with PMMA matrix to increase miscible. Because the P₁₂₃ (EO₂₀PO₇₀EO₂₀) surfactant had larger PO/EO ratio, which possessed relatively higher hydrophobicity than the low molecular weight CTAB, PMMA/SBA-15 (with template) composite showed better properties than PMMA/MCM-41 (with template) composite.