DSC studies of linear low density polyethylene. Insights into the disrupting effect of different comonomers and the minimum fold chain length of the polyethylene lamallae
DSC studies of linear low density polyethylene. Insights into the disrupting effect of different comonomers and the minimum fold chain length of the polyethylene lamallae
复制标题
DOI：
10.1002/macp.1985.021861226
复制
发表时间：
1985-12
影响因子：
2.5
通讯作者：
D. R. Burfield;N. Kashiwa
中科院分区：
文献类型：
--
作者：
D. R. Burfield;N. Kashiwa
本文报道了用丙烯、1-丁烯或4-甲基-1-戊烯共聚单体制备的一系列线性低密度聚乙烯（LLDPE）的DSC检查。LLDPE结晶区的熔合焓随共聚单体含量的增加而逐渐降低，且与共聚单体类型无关。因此，聚合物结晶度的破坏主要取决于不规则链的数量和分布。序列长度n = 14被计算为临界链尺寸，低于此长度聚乙烯片段不能容易地装入稳定的晶格。
This paper reports a DSC examination of a series of linear low density polyethylenes (LLDPE) prepared variously with propylene, 1-butene or 4-methyl-1-pentene comonomers. The enthalpy of fusion of the crystalline regions of the LLDPE decreases progressively with increasing comonomer content and is effectively independent of the comonomer type. Disruption of polymer crystallinity is thus determined principally by the number and distribution of the chain irregularities. A sequence length of n = 14 was calculated as the critical chain dimension below which polyethylene segments cannot be readily packed into a stable crystal lattice.