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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，热学和流变学的观点。

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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：通过熔融共混成功地制备了基于天然橡胶（NR）和聚乳酸（PLA）的生物基石墨烯增强热塑性弹性体（TPE）。研究了石墨烯纳米片（GNS）含量和偶联剂对PLA / NR / GNS生物纳米复合材料的形貌，热学和流变性质的影响。在相容剂的存在下，在连续的PLA基质中均匀分散的NR相具有更窄的直径尺寸分布，形态更加稳定。此外，在ENR相容的PLA / NR / GNS生物纳米复合材料的情况下，透射电子显微照片显示，GNS的分散性得到了改善，并具有主要剥落的形态。结晶/熔融研究表明，随着GNS含量的增加，冷结晶峰，熔融峰和玻璃-橡胶转变温度值移至较高温度，共混物的结晶度略有下降（约7％），这可能是由于通过GNS的限制作用来降低聚合物链段的流动性。动态力学研究表明，由于GNS的固有刚度以及在ENR存在下PLA / NR混合物中的相容性的出现，通过引入GNS可使储能模量（E）增加了约25％。 ENR的存在使NR相的Tg和PLA基质彼此相对移动，这是更高的混溶性和相容性的特征。热重法（TGA）和微分热重法（DTG）曲线显示，由于ENR的存在直接影响了界面粘合力和GNS的均匀分散性，因此相容的PLA / NR共混物具有更高的热稳定性。流变学研究表明，由于GNS分别承担载荷和限制分子运动的有效性，由于ENR的存在，形成有效的GNS-聚合物网络增加了储能模量（G）和复数粘度（*）值。[图形]。

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