The main purpose of this study was to investigate influences of three parameters on the mechanical and thermal properties of the polylactide (PLA) matrix nanocomposites filled with polyhedral oligomeric silsesquioxane (POSS) particles. For the first parameter of “Filler Content”, nanocomposites with 1, 3, 5, 7 wt% basic POSS structure were compared. For the second parameter of “Functional Group,” basic POSS structure having only nonpolar isobutyl groups were compared with three other functionalized POSS structures; i.e. aminopropylisobutyl-POSS (ap-POSS), propanediolisobutyl-POSS (pd-POSS) and octasilane-POSS (os-POSS). Finally, for the third parameter of “Copolymer Compatibilization,” all specimens were compared before and after their maleic anhydride (MA) grafted copolymer compatibilization. Specimens were produced with twin-screw extruder melt mixing and shaped under compression molding. Various tests and analyses indicated that the optimum filler content for the improved mechanical properties was 1 wt%; while the optimum structure for strength and modulus was pd-POSS structure, in terms of fracture toughness it was basic POSS structure. Additional use of MA compatibilization was especially effective for the basic POSS and os-POSS particles.

这项研究的主要目的是研究三个参数对填充有多面体低聚倍半硅氧烷（POSS）颗粒的聚丙交酯（PLA）基质纳米复合材料的机械和热性能的影响。对于“填料含量”的第一个参数，比较了具有1、3、5、7 wt％基本POSS结构的纳米复合材料。对于“官能团”的第二个参数，将仅具有非极性异丁基的基本POSS结构与其他三个官能化的POSS结构进行了比较。即氨基丙基异丁基-POSS（ap-POSS），丙二醇异丁基-POSS（pd-POSS）和八硅烷-POSS（os-POSS）。最后，对于“共聚物增容”的第三个参数，在马来酸酐（MA）接枝共聚物增容之前和之后比较所有样品。通过双螺杆挤出机熔融混合制备样品，并在压缩模塑下成型。各种测试和分析表明，用于改善机械性能的最佳填料含量为1 wt％。强度和模量的最佳结构是pd-POSS结构，就断裂韧性而言，它是基本的POSS结构。MA增容的附加使用对基本的POSS和os-POSS颗粒特别有效。