Lin Jia-Horng, Pan Yi-Jun, Liu Chi-Fan, Huang Chien-Lin, Hsieh Chien-Teng, Chen Chih-Kuang, Lin Zheng-Ian, Lou Ching-Wen
Laboratory of Fiber Application and Manufacturing, Department of Fiber and Composite Materials, Feng Chia University, Taichung City 40724, Taiwan.
School of Chinese Medicine, China Medical University, Taichung City 40402, Taiwan.
Materials (Basel). 2015 Dec 17;8(12):8850-8859. doi: 10.3390/ma8125496.
This study proposes melt-blending polypropylene (PP) and high density polyethylene (HDPE) that have a similar melt flow index (MFI) to form PP/HDPE polyblends. The influence of the content of HDPE on the properties and compatibility of polyblends is examined by using a tensile test, flexural test, Izod impact test, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), polarized light microscopy (PLM), and X-ray diffraction (XRD). The SEM results show that PP and HDPE are incompatible polymers with PP being a continuous phase and HDPE being a dispersed phase. The FTIR results show that the combination of HDPE does not influence the chemical structure of PP, indicating that the polyblends are made of a physical blending. The DSC and XRD results show that PP and HDPE are not compatible, and the combination of HDPE is not correlated with the crystalline structure and stability of PP. The PLM results show that the combination of HDPE causes stacking and incompatibility between HDPE and PP spherulites, and PP thus has incomplete spherulite morphology and a smaller spherulite size. However, according to mechanical property test results, the combination of HDPE improves the impact strength of PP.
本研究提出将具有相似熔体流动指数（MFI）的聚丙烯（PP）和高密度聚乙烯（HDPE）进行熔融共混，以形成PP/HDPE共混物。通过拉伸试验、弯曲试验、悬臂梁冲击试验、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、差示扫描量热法（DSC）、偏光显微镜（PLM）和X射线衍射（XRD）来考察HDPE含量对共混物性能和相容性的影响。SEM结果表明，PP和HDPE是不相容的聚合物，其中PP为连续相，HDPE为分散相。FTIR结果表明，HDPE的加入不影响PP的化学结构，这表明共混物是由物理共混制成的。DSC和XRD结果表明，PP和HDPE不相容，HDPE的加入与PP的晶体结构和稳定性无关。PLM结果表明，HDPE的加入导致HDPE与PP球晶之间发生堆积和不相容，因此PP具有不完全的球晶形态且球晶尺寸较小。然而，根据力学性能测试结果，HDPE的加入提高了PP的冲击强度。
