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首页> 外文期刊>Journal of Polymers and the Environment >Nano Graphene-Reinforced Bio-nanocomposites Based on NR/PLA: The Morphological, Thermal and Rheological Perspective
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Nano Graphene-Reinforced Bio-nanocomposites Based on NR/PLA: The Morphological, Thermal and Rheological Perspective

机译：基于NR / PLA的纳米石墨烯增强生物纳米复合材料：形态学，热和流变视角

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摘要

Bio-based graphene-reinforced thermoplastic elastomers (TPE) based on natural rubber (NR), and poly lactic acid (PLA) were successfully prepared via melt blending. The effect of graphene nanosheets (GNS) content and coupling agent were investigated on morphological, thermal and rheological properties of the PLA/NR/GNS bio-nanocomposites. More stable morphology of uniformly dispersed NR phase in the continuous PLA matrix with a relatively narrower diameter-size distribution was achieved in the presence of a compatibilizer. Moreover, transmission electron micrographs showed more improved dispersion of GNS with predominantly exfoliated morphology in the case of ENR-compatibilized PLA/NR/GNS bio-nanocomposites. Crystallization/melting studies revealed that, as the GNS content increased, the cold-crystallization peak, melting peak and glass-to-rubber transition temperature values shifted to higher temperatures and the crystallinities of blends slightly decreased (about 7%) which might be attributed to the reduction of polymeric segments mobility by the restricting effect of GNS. Dynamical mechanical investigation showed that the storage modulus (E) increased about 25% by the introduction of GNS due to the inherent stiffness of GNS and the occurrence of compatibility in the PLA/NR blend in the presence of ENR. The presence of ENR shifted the Tg of the NR phase and the PLA matrix towards each other which is a characteristic of higher miscibility and compatibility. The thermogravimetry (TGA) and derivative thermogravimetry (DTG) curves revealed higher thermal stability of the compatibilized-PLA/NR blends due to the enhanced interfacial adhesion and the homogenous dispersion of GNSs as direct effects of the presence of ENR. Rheological studies indicated that the formation of the effective GNS-polymer networks by the presence of ENR increased the storage modulus (G) and complex viscosity (*) value due to the effectiveness of the GNS in taking loads and restricted molecular motion, respectively.[GRAPHICS].
机译：基于天然橡胶（NR）的生物基石墨烯增强热塑性弹性体（TPE）和聚乳酸（PLA）通过熔融共混制备。研究了石墨烯纳米片（GNS）含量和偶联剂的影响，研究了PLA / NR / GNS生物纳米复合材料的形态学，热和流变性质。在相容剂的存在下，实现了连续PLA基质中均匀分散的NR相的均匀分散的NR相的形貌。在相容剂的存在下实现了相对较窄的直径尺寸分布。此外，透射电子显微照片显示GNS的分散更改善，在ARN相关的PLA / NR / GNS生物纳米复合材料的情况下具有主要剥离的形态。结晶/熔化研究表明，随着GNS含量的增加，冷结晶峰，熔化峰值和玻璃致橡胶过渡温度值移动到较高温度，并且共混物的晶体略微降低（约7％），其可能是归因的通过GNS的限制效应来减少聚合物区段迁移率。动态机械研究表明，由于GNS的固有刚度以及PLA / NR混合物在eNR的存在下，通过引入GNS，储存模量（e）通过引入GNS增加了约25％。 ENG的存在使NR相的TG与PLA矩阵相互移位，这是更高的混溶性和兼容性的特征。由于增强的界面粘附和GNSS的均匀分散，GNSS的均匀分散，热重滴定法（TGA）和衍生物热重度（DTG）曲线揭示了增强的PLA / NR混合物的热稳定性。流变学研究表明，由于GNS在载荷和限制分子运动中的有效性，通过ench的存在增加了有效的GNS-聚合物网络的形成。[ [图形]。

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