The influence of short chain branch on formation of shear induced crystals in bimodal polyethylene at high shear temperatures
The influence of short chain branch on formation of shear induced crystals in bimodal polyethylene at high shear temperatures
复制标题
高剪切温度下短链支化对双峰聚乙烯剪切诱导晶体形成的影响
DOI：
10.1016/j.eurpolymj.2018.03.036
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发表时间：
2018-08
影响因子：
6
通讯作者：
Hsiao Benjamin S.
中科院分区：
文献类型：
--
作者：
Jiang Libin;An Minfang;Wu Feng;Miao Weijun;Wang Zongbao;Zhang Yaopeng;Hsiao Benjamin S.
采用原位小角x射线散射（SAXS）和广角x射线衍射（WAXD）技术研究了不同短链支含量的高分子量双峰聚乙烯在低剪切速率和高温下的剪切结晶过程。SAXS和WAXD结果表明，在139和136 ℃的剪切温度下形成了shish晶体，随后在121 ℃的等温结晶温度下形成了kebab晶体和取向片层。由于松弛时间的增加，短链分支的存在显著地促进了羊肉串晶体的形成，但过多的短链分支阻碍了羊肉串晶体的形成，形成更有取向的片层。这些证据清楚地表明，尽管短链分支的存在阻碍了羊肉串晶体的结晶性，但在高温剪切下，它仍然可以有效地促进羊肉串晶体的形成。
The shear-induced crystallization of bimodal polyethylene with high molecular weight fraction having different content of short chain branch at low shear rate and high temperatures was investigated byin-situsmall-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) techniques. SAXS and WAXD results indicate that shish crystals form at different shear temperatures of 139 and 136 °C, subsequently kebab crystals and oriented lamellae form at the isothermal crystallization temperature of 121 °C. The presence of short chain branch significantly promotes the formation of shish-kebab crystals owing to the increase of the relaxation time, but overmuch short chain branch impedes the formation of shish-kebab crystals and form more oriented lamellae. These evidences clearly indicate that even though the existence of short chain branch impedes the crystallizability, it can still effectively promote the formation of shish-kebab crystals at high shear temperatures.
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