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首页> 外文期刊>Journal of Applied Polymer Science >Covulcanization of LLDPE/EMA blends using dicumyl peroxide
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Covulcanization of LLDPE/EMA blends using dicumyl peroxide

机译：使用过氧化二枯基将LLDPE / EMA混合物共硫化

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摘要

The effect of dicumyl peroxide (DCP) content on the gel fraction, mechanical, dynamic mechanical, and thermal properties of linear low-density polyethylene (LLDPE)/ethylene-co-methyl acrylate (EMA) blends were studied. Gel content of the blends increases with increasing DCP content, and EMA is more prone to crosslinking than LLDPE. Wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) were used to study the effect of DCP crosslinking on percent crystallinity and crystalline structure of the blends and individual components. At lower level of DCP loading, crosslinking process does not have significant effect on the crystalline structure of the LLDPE, which was confirmed from the percent crystallinity and lattice distance value. However, at higher DCP content, percent crystallinity decreases significantly. At lower EMA concentration (<50%), percent crystallinity and lattice distance remain unchanged up to 2 wt % of DCP. For EMA contents of more than 50 wt %, increasing DCP content reduces the crystallinity of the blends and increases the lattice distance. The highest level of mechanical and dynamic mechanical properties was observed for 60/40 LLDPE/EMA blends at 2 wt % DCP. Addition of LLDPE-g-MA (3 wt %) as a compatibilizer enhances the properties of the vulcanizates. Blends crosslinked with DCP up to 0.3 wt % can easily be reprocessed.
机译：研究了过氧化二枯基（DCP）含量对线性低密度聚乙烯（LLDPE）/乙烯-丙烯酸甲酯（EMA）共混物的凝胶分数，机械，动态机械和热性能的影响。共混物的凝胶含量随DCP含量的增加而增加，并且EMA比LLDPE更易于交联。广角X射线衍射（WAXD）和差示扫描量热法（DSC）用于研究DCP交联对共混物和单个组分的结晶度百分比和晶体结构的影响。在较低水平的DCP负载下，交联过程对LLDPE的晶体结构没有显着影响，这可从结晶度百分比和晶格距离值确定。但是，在较高的DCP含量下，结晶度百分比明显降低。在较低的EMA浓度（<50％）下，高达2wt％的DCP，结晶度百分比和晶格距离保持不变。对于超过50重量％的EMA含量，增加DCP含量降低了共混物的结晶度并增加了晶格距离。在2 wt％DCP下观察到60/40 LLDPE / EMA共混物的机械和动态机械性能最高。添加LLDPE-g-MA（3重量％）作为增容剂增强了硫化胶的性能。与DCP交联的共混物（最多0.3 wt％）可以轻松进行再加工。

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