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首页> 外文期刊>Polymers & Polymer Composites >Preparation of Linear Low Density Polyethylene/ Poly(ethylene-co-vinyl acetate) Blend Films with Various Transparencies
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Preparation of Linear Low Density Polyethylene/ Poly(ethylene-co-vinyl acetate) Blend Films with Various Transparencies

机译：各种透明度的线性低密度聚乙烯/聚乙烯-乙酸乙烯酯共混膜的制备

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摘要

Linear low density polyethylene (LLDPE)/poly(ethylene-co-vinyl acetate) (EVAc) blend films having various vinyl acetate (VAc) contents (12,18, and 25 wt.%) with various degrees of transparency were prepared using a hot plate press. Effects of VAc contents in EVAc and ratio of EVAc in LLDPE/EVAc blend films on the structure and properties of these films were investigated through a series of instrumental analyses. The transparencies of films were classified into three types: non-transparent (1-75 T(%)), semi-transparent (76-85 T(%)), and transparent (86-100 T(%)). With increasing the contents of VAc in EVAc and the ratio of EVAc in blend films, the transparencies of films were increased. The differential scanning calorimeter curves of blend films show that there are two obvious endothermic peaks at around 125 and 75-85 °C, which corresponded to the melting of the LLDPE and EVAc crystals, respectively. The intensity of crystalline peaks of LLDPE decreased as the ratio of EVAc in blend films was increased. The thermal stability of blend film decreased with increasing degree of transparency. This might be due to the fact that transparent film can contain higher amount of amorphous regions, which were degraded at lower temperature than that of non-transparent films having high contents of crystalline regions. The storage modulus of non-transparent films was higher than that of semi-transparent films due to a higher crystallinity.
机译：利用热板印刷机。通过一系列的仪器分析，研究了EVAc中的VAc含量和LLDPE / EVAc共混膜中EVAc的比例对这些膜的结构和性能的影响。胶片的透明度分为三种类型：不透明（1-75 T（％）），半透明（76-85 T（％））和透明（86-100 T（％））。随着EVAc中VAc含量的增加和共混薄膜中EVAc的比例增加，薄膜的透明度也随之增加。共混膜的差示扫描量热曲线表明，在125和75-85°C附近有两个明显的吸热峰，分别对应于LLDPE和EVAc晶体的熔化。 LLDPE结晶峰的强度随着共混膜中EVAc比例的增加而降低。共混膜的热稳定性随着透明度的增加而降低。这可能是由于与具有高结晶区域含量的非透明膜相比，透明膜可以包含更高数量的非晶区，该非晶区在较低的温度下会降解。由于较高的结晶度，非透明膜的储能模量高于半透明膜的储能模量。

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