Czarnecka-Komorowska Dorota, Sterzynski Tomasz
Poznan University of Technology, Institute of Materials Technology, Polymer Processing Division, Piotrowo 3 Street, PL-61138 Poznan, Poland.
Polymers (Basel). 2018 Feb 17;10(2):203. doi: 10.3390/polym10020203.
The effects of octakis[(3-glycidoxypropyl)dimethylsiloxy]octasilsesquioxane (GPOSS) on the crystallinity, crystal structure, morphology, and mechanical properties of polyoxymethylene (POM) and POM/GPOSS composites were investigated. The POM/GPOSS composites with varying concentrations of GPOSS nanoparticles (0.05⁻0.25 wt %) were prepared via melt blending. The structure of POM/GPOSS composites was characterized by differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD), and polarized light microscopy (PLM). The mechanical properties were determined by standardized tensile tests. The morphology and dispersion of GPOSS nanoparticles in the POM matrix were investigated with scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. It was observed that the dispersion of the GPOSS nanoparticles was uniform. Based on DSC studies, it was found that the melting temperature, lamellar thickness, and the degree of crystallinity of the POM/GPOSS composites increased. The POM/GPOSS composites showed an increased Young's modulus and tensile strength. Finally, compared with the pure POM, the addition of GPOSS reduced the spherulites' size and improved the crystallinity of the POM, which demonstrates that the nucleation effect of GPOSS is favorable for the mechanical properties of POM.
研究了八（3-缩水甘油氧基丙基）二甲基硅氧基倍半硅氧烷（GPOSS）对聚甲醛（POM）以及POM/GPOSS复合材料的结晶度、晶体结构、形态和力学性能的影响。通过熔融共混制备了具有不同浓度GPOSS纳米颗粒（0.05⁻0.25 wt%）的POM/GPOSS复合材料。采用差示扫描量热法（DSC）、广角X射线衍射（WAXD）和偏光显微镜（PLM）对POM/GPOSS复合材料的结构进行了表征。通过标准拉伸试验测定力学性能。利用扫描电子显微镜（SEM）和能量色散X射线（EDX）分析研究了GPOSS纳米颗粒在POM基体中的形态和分散情况。观察到GPOSS纳米颗粒的分散是均匀的。基于DSC研究发现，POM/GPOSS复合材料的熔点、片晶厚度和结晶度增加。POM/GPOSS复合材料的杨氏模量和拉伸强度有所提高。最后，与纯POM相比，添加GPOSS减小了球晶尺寸并提高了POM的结晶度，这表明GPOSS的成核作用有利于POM的力学性能。
