Toughening Poly(lactic acid) with Imidazolium-based Elastomeric Ionomers
Toughening Poly(lactic acid) with Imidazolium-based Elastomeric Ionomers
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使用咪唑基弹性体离聚物增韧聚乳酸
DOI：
10.1007/s10118-018-2143-6
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发表时间：
2018-05
期刊：
影响因子：
--
通讯作者：
Yuesheng Li
中科院分区：
文献类型：
--
作者：
Lu Chen;Kuan Hu;Siting Sun;Hai Jiang;Dong Huang;Kunyu Zhang;Li Pan;Yuesheng Li
采用咪唑类化合物对溴化聚异丁烯-异戊二烯共聚物（BIIR）进行离子改性，合成了咪唑类弹性离聚物（i-BIIR），并对其作为聚乳酸（PLA）的新型增韧剂进行了研究。通过动态力学分析（DMA）、差示扫描量热法（DSC）、扫描电镜（SEM）、拉伸和冲击测试等手段，研究了离聚体及其共混物的相容性、热行为、相形态和力学性能。DMA和SEM结果表明，与PLA/未改性BIIR弹性体相比，PLA/i-BIIR弹性体具有更好的相容性。含1-十二烷基咪唑链的聚乳酸/异丁腈橡胶共混物（i-BIIR-12）的断裂伸长率最高可达235%，是纯聚乳酸的10倍以上。对于PLA/10 wt% i-BIIR-12共混物，PLA的冲击强度从1.9 kJ/m2提高到4.1 kJ/m2。通过对共混体系相容性、分子间相互作用和相结构的系统分析，确立了增韧机理。由于合适的界面粘附力，界面气穴引发了PLA基质的大规模剪切屈服，这在这些共混物的巨大增韧效应中发挥了关键作用。我们认为，在BIIR弹性体中引入咪唑基团对于形成合适的界面粘合是至关重要的。
Imidazolium-based elastomeric ionomers (i-BIIR) were facilely synthesized by ionically modified brominated poly(isobutylene-co-isoprene) (BIIR) with different alkyl chain imidazole and thoroughly explored as novel toughening agents for poly(lactic acid) (PLA). The miscibility, thermal behavior, phase morphology and mechanical property of ionomers and blends were investigated through dynamic mechanical analyses (DMA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), tensile and impact testing. DMA and SEM results showed that better compatibility between the PLA and i-BIIR was achieved compared to the PLA/unmodified BIIR elastomer. A remarkable improvement in ductility with an optimum elongation at break up to 235% was achieved for the PLA/i-BIIR blends with 1-dodecylimidazole alkyl chain (i-BIIR-12), more than 10 times higher than that of pure PLA. The impact strengths of PLA were enhanced from 1.9 kJ/m2 to 4.1 kJ/m2 for the PLA/10 wt% i-BIIR-12 blend. Toughening mechanism had been established by systematical analysis of the compatibility, intermolecular interaction and phase structures of the blends. Interfacial cavitations initiated massive shear yielding of the PLA matrix owing to a suitable interfacial adhesion which played a key role in the enormous toughening effect in these blends. We believed that introducing imidazolium group into the BIIR elastomer was vital for the formation of a suitable interfacial adhesion.
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影响因子：
4.3
作者：
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通讯作者：
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影响因子：
8.4
作者：
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影响因子：
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作者：
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通讯作者：
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