Dynamic mechanical, thermal, physico-mechanical and morphological properties of LLDPE/EMA blends
Dynamic mechanical, thermal, physico-mechanical and morphological properties of LLDPE/EMA blends
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DOI：
10.1007/s10965-010-9450-0
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发表时间：
2011-07-01
影响因子：
2.8
通讯作者：
Chaki, Tapan Kumar
中科院分区：
文献类型：
--
作者：
Borah, Jyoti S.;Chaki, Tapan Kumar
研究了共混组成对线性低密度聚乙烯（LLDPE）/乙烯-丙烯酸甲酯共聚物（EMA）共混物的形态结构、动态力学性能、热性能和物理力学性能的影响。共混物表现出分散相和连续相形态，这取决于共混物的组成。对于含有50重量%EMA的共混物形成共连续结构。动态力学研究表明，随着EMA含量的增加，共混物的柔韧性随着非晶区的扩大而增强。然而，在差示扫描量热法（DSC）分析中观察到的两个独立的熔融温度峰表明，共混物是不相容的两种聚合物的结晶区。X射线衍射（XRD）研究表明，共混物的结晶度随着EMA含量的增加而降低，拉伸强度与混合规则的负偏差表明两组分之间的界面粘合性较差。FTIR光谱确定LLDPE和EMA之间缺乏化学相互作用，这支持SEM、DSC、DMA和XRD观察结果。采用双锥-空隙模型对共混物的相形态进行了表征。
The effect of blend composition on the morphology, dynamic mechanical properties, thermal and physico-mechanical properties of linear low density polyethylene (LLDPE)/ ethylene-co-methyl acrylate (EMA) blends were studied. The blend showed both dispersed and continuous phase morphology that depends on the blend composition. A co-continuous structure is formed for blends containing 50 wt% of EMA. Dynamic mechanical studies showed that flexibility of the blend enhanced with the expansion of the amorphous region as EMA content increased. However, two separate melting temperature peak observed in differential scanning calorimetry (DSC) analysis indicate that the blends are immiscible in crystalline region of the two polymers. X-ray diffraction (XRD) studies showed that crystallinity of blends decreases with increase in EMA content and negative deviation of tensile strength from the mixing rule indicates the poor interfacial adhesion between the two components. FTIR spectroscopy established the lack of chemical interaction between LLDPE and EMA, which support the SEM, DSC, DMA and XRD observations. Parallel-Voids model has been applied to characterize phase morphology of these blends.