Study on molecular weight dependence of short‐chain branching of linear low‐density polyethylene using the gel permeation chromatography/Fourier transform infrared method
Study on molecular weight dependence of short‐chain branching of linear low‐density polyethylene using the gel permeation chromatography/Fourier transform infrared method
复制标题
凝胶渗透色谱/傅里叶变换红外法研究线性低密度聚乙烯短链支化的分子量依赖性
DOI：
10.1002/marc.1988.030090803
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Mitsuhiko Morimoto
中科院分区：
文献类型：
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作者：
T. Housaki;K. Satoh;K. Nishikida;Mitsuhiko Morimoto
所谓的线性低密度聚乙烯（LLDPE）在商业上变得越来越重要。LLDPE由于α-烯烃如1-丁烯、1-己烯、1-辛烯或C甲基-1-戊烯作为共聚单体而具有一些短链支化（SCB）。SCB的分布是决定LLDPE性能的因素之一。在这方面，对LLDPE的详细分子结构进行了研究，并证实了LLDPE具有非均匀化学组成的事实。到目前为止，线性低密度聚乙烯的分馏和随后的测定每个馏分的分子结构的光谱和其他方法来解释其化学组成的异质性。然而，分馏技术是耗时和繁琐的。为了提供具有快速和容易操作的系统，期望在分馏期间获得关于分子结构的信息而不将溶质与洗脱液分离。在这个快速的通信，本作者希望证明，凝胶渗透色谱/傅立叶变换红外线提出了一种替代的分馏技术。该方法利用GPC作为基于分子量分离LLDPE的工具，并利用FTIR分光光度计作为在GPC分析期间获得化学结构信息的工具。本系统提供了通过GPCAR测定的短链支化的分子量分布。a）1988年4月23日的修订稿。
So-called linear low-density polyethylene (LLDPE) is becoming more and more commercially important. LLDPE has some short-chain branching (SCB) due to an a-olefin such as I-butene, 1-hexene, I-octene, or Cmethyl-1-pentene as the comonomer. The distribution of SCB is one of the factors the properties of LLDPE depend on. With this regard, an investigation of the detailed molecular structure of LLDPE was performed and the fact that LLDPE exhibits a heterogeneous chemical composition was observed'). So far, fractionation of LLDPE and subsequent determination of the molecular structure of each fraction by spectroscopic and other methods were employed to exemplify the heterogeneity of its chemical composition. However, the fractionation technique is time-consuming and tedius. In order to provide a system with rapid and easy operation, it would be desirable to obtain information on the molecular structure during fractionation without separation of solute from the eluent. In this rapid communication, the present authors wish to demonstrate that gel permeation chromatography/Fourier transform infrared present an alternative to the fractionation technique. This method utilizes GPC as a tool to separate LLDPE on the basis of molecular weight and an FTIR spectrophotometer as a tool to obtain information on the chemical structure during GPC analysis. The present system provides the molecular weight distribution of short chain branching as determined by GPCAR. a) Revised manuscript of April 23, 1988.