Preparation and properties of biodegradable poly(lactic acid)/poly(butylene adipate-co-terephthalate) blend with glycidyl methacrylate as reactive processing agent
Preparation and properties of biodegradable poly(lactic acid)/poly(butylene adipate-co-terephthalate) blend with glycidyl methacrylate as reactive processing agent
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DOI：
10.1007/s10853-008-3049-4
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发表时间：
2009-01-01
影响因子：
4.5
通讯作者：
Wang, Liang
中科院分区：
文献类型：
--
作者：
Zhang, Naiwen;Wang, Qinfeng;Wang, Liang
在甲基丙烯酸缩水甘油酯（GMA）的存在下，采用双螺杆挤出机对聚乳酸（PLA）和聚己二酸丁二醇酯-对苯二甲酸丁二醇酯（PBAT）进行熔融共混。通过拉伸试验、夏比冲击试验、扫描电镜（SEM）、差示扫描量热仪（DSC）和先进流变扩展系统（战神）对共混物的物理性能、相形态、热性能和熔体流变行为进行了研究。当GMA含量为2或5wt%时，PLA/PBAT共混物的拉伸韧性大大提高，拉伸强度没有严重损失。共混物的冲击强度也显着提高，在1重量%的GMA添加，但最终趋于饱和与增加GMA。SEM分析表明，共混物具有较好的相容性和更多的剪切屈服机制。DSC结果表明，在反应剂存在下，共混物仍为两相体系，GMA的加入提高了PLA与PBAT之间的界面粘结力。流变学结果表明，T-GMA的加入提高了共混物在几乎所有频率下的储能模量（G '）、损耗模量（G“）和复数粘度。在T-GMA存在下的共混物的剪切稀化趋势的降低也意味着在加工过程中改善的熔体稳定性。
Poly(lactic acid) (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) were melt-blended in the presence of glycidyl methacrylate (GMA) by twin-screw extrusion. The physical properties, phase morphology, thermal properties, and melt rheological behavior of the blends were investigated by tensile tests, Charpy impact tests, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and advanced rheology expended system (ARES). With 2 or 5 wt% GMA, the tensile toughness of the PLA/PBAT blend was greatly increased without severe loss in tensile strength. The impact strength of the blend was also significantly improved at 1 wt% of GMA addition but ultimately trended to be saturated with increasing GMA. SEM micrographs revealed that better miscibility and more shear yielding mechanism were involved in the toughening of the blend. DSC results indicated that the blend is still a two-phase system in the presence of reaction agent and the addition of GMA was found to enhance the interfacial adhesion between PLA and PBAT. Rheological results revealed that the addition of T-GMA increased the storage moduli (G'), loss moduli (G'') and complex viscosity of the blends at nearly all frequencies. The decreased shear-thinning tendency of the blends in the presence of T-GMA also implied improved melt stability during processing.