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首页> 美国卫生研究院文献>Polymers >The Effect of Surface Treatment with Isocyanate and Aromatic Carbodiimide of Thermally Expanded Vermiculite Used as a Functional Filler for Polylactide-Based Composites
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The Effect of Surface Treatment with Isocyanate and Aromatic Carbodiimide of Thermally Expanded Vermiculite Used as a Functional Filler for Polylactide-Based Composites

机译：具有异氰酸酯和芳族碳二亚胺的表面处理的效果其用作聚酯基复合材料的官能填料

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In this work, thermally expanded vermiculite (TE-VMT) was surface modified and used as a filler for composites with a polylactide (PLA) matrix. Modification of vermiculite was realized by simultaneous ball milling with the presence of two PLA chain extenders, aromatic carbodiimide (KI), and 4,4’-methylenebis(phenyl isocyanate) (MDI). In addition to analyzing the particle size of the filler subjected to processing, the efficiency of mechanochemical modification was evaluated by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The composites of PLA with three vermiculite types were prepared by melt mixing and subjected to mechanical, thermomechanical, thermal, and structural evaluation. The structure of composites containing a constant amount of the filler (20 wt%) was assessed using FTIR spectroscopy and SEM analysis supplemented by evaluating the final injection-molded samples’ physicochemical properties. Mechanical behavior of the composites was assessed by static tensile test and impact strength hardness measurements. Heat deflection temperature (HDT) test and dynamic thermomechanical analysis (DMTA) were applied to evaluate the influence of the filler addition and its functionalization on thermomechanical properties of PLA-based composites. Thermal properties were assessed by differential scanning calorimetry (DSC), pyrolysis combustion flow calorimetry (PCFC), and thermogravimetric analysis (TGA). The use of filler-reactive chain extenders (CE) made it possible to change the vermiculite structure and obtain an improvement in interfacial adhesion and more favorable filler dispersions in the matrix. This translated into an improvement in impact strength and an increase in thermo-mechanical stability and heat release capacity of composites containing modified vermiculites.
机译：在这项工作中，将热膨胀的蛭石（TE-VMT）进行表面改性并用作具有聚丙酯（PLA）基质的复合材料的填料。通过同时球磨，通过两种PLA链子增速剂，芳族碳二亚胺（Ki）和4,4'-亚甲基（苯基异氰酸酯）（MDI）的同时球磨来实现蛭石的修饰。除了分析经过加工的填料的粒度之外，通过傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）评估机械化学改性效率。通过熔融混合制备具有三种蛭石类型的PLA复合材料，并进行机械，热机械，热和结构评估。使用FTIR光谱和SEM分析来评估含有恒定量的填料（20wt％）的复合材料的结构，通过评估最终注塑模塑样品的物理化学性质补充。通过静态拉伸试验和冲击强度硬度测量来评估复合材料的力学行为。采用热偏转温度（HDT）试验和动态热机械分析（DMTA）来评估填料加法的影响及其官能化对PLA基复合材料的热机械性能。通过差示扫描量热法（DSC），热解燃烧流量量热法（PCFC）和热重分析（TGA）评估热性能。使用填料 - 反应性链延伸器（Ce）使得可以改变蛭石结构并在基质中获得界面粘附和更有利的填充分散体的改善。这转化为抗冲突力的改善和含有改性蛭石的复合材料的热机械稳定性和热释放能力的提高。

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