扫描电子显微镜，能量色散X射线能谱和电子能量损失谱研究的PLLA / PVDF共混物的反应增容机理,ACS Applied Energy Materials

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扫描电子显微镜，能量色散X射线能谱和电子能量损失谱研究的PLLA / PVDF共混物的反应增容机理
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-03-25 00:00:00 , DOI: 10.1021/acsapm.9b00061
Wenyong Dong _{1,

2} , Hideki Hakukawa ₁ , Naohiro Yamahira ₁ , Yongjin Li ₂ , Shin Horiuchi ₁

Affiliation

反应性增容剂在PLLA（poly（l扫描透射电子显微镜（STEM）结合能量色散X射线光谱（EDX）和电子能量损失谱（EELS）研究了-乳酸））和PVDF（聚偏二氟乙烯）。用环氧基和聚甲基丙烯酸甲酯（PMMA）链官能化的多面体低聚倍半硅氧烷（POSS）作为增容剂应用于不混溶的PLLA / PVDF（50/50 wt％）共混物中。通过环氧基团与PLLA的化学反应和PMMA溶解到PVDF相中添加官能化的POSS，成功地使共混物相容。通过EDX元素分析表征了POSS增容剂在PLLA / PVDF界面处的定位行为，该行为受熔融共混条件的影响。我们还通过EELS中边缘微细结构附近的能量损失研究了界面区域中的局部化学结构。通过对与POSS衍生物相容的PLLA / PVDF界面的STEM-EDX / EELS分析，我们提出了不相溶的聚合物共混物反应性相容化的机理。

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Mechanism of Reactive Compatibilization of PLLA/PVDF Blends Investigated by Scanning Transmission Electron Microscopy with Energy-Dispersive X-ray Spectrometry and Electron Energy Loss Spectroscopy

The localization of reactive compatibilizers at the interfaces in polymer blends of PLLA (poly(l-lactic acid)) and PVDF (poly(vinylidene fluoride)) was investigated by scanning transmission electron microscopy (STEM) combined with energy-dispersive X-ray spectrometry (EDX) and electron energy loss spectroscopy (EELS). Polyhedral oligomeric silsesquioxane (POSS) functionalized with epoxide groups and poly(methyl methacrylate) (PMMA) chains was applied as compatibilizer in the immiscible PLLA/PVDF (50/50 wt %) blend. The blends were successfully compatibilized by adding the functionalized POSS through the chemical reaction of epoxide group with PLLA and the dissolution of PMMA into PVDF phase. The localization behaviors of the POSS compatibilizers at the PLLA/PVDF interfaces, which were influenced by melt-blend conditions, were characterized by EDX elemental analysis. We also investigated the local chemical structures in the interfacial regions by energy-loss near edged fine structure in EELS. We proposed the mechanism of the reactive compatibilization of immiscible polymer blends by the STEM-EDX/EELS analysis of the PLLA/PVDF interfaces compatibilized with the POSS derivatives.

更新日期：2019-03-25

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