| 升温淋洗分级制备不同结晶度LLDPE的研究 |
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| 引用本文： | 孔杰,范晓东,贾昧.升温淋洗分级制备不同结晶度LLDPE的研究[J].塑料工业,2003,31(9):4-6. |
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| 作者姓名： | 孔杰 范晓东 贾昧 |
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| 作者单位： | 西北工业大学化学工程系,陕西,西安,710072 |
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| 基金项目： | 国防军工计量“十五”计划重点项目 (610 0 5 2 17) |
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| 摘 要： | 采用升温淋洗分级(TREF)制备了不同结晶度的线型低密度聚乙烯(LLDPE)级分，并采用差示扫描量热仪(DSC)和傅立叶红外光谱(FTIR)对级分的结晶、熔融行为和短链支化度进行了研究。结果表明：LLDPE级分的结晶度和熔点与淋洗温度成线性关系；随淋洗温度的升高，级分结晶能力增强、结晶度升高、熔点升高、短链支化度变小；TREF淋洗温度依赖于LLDPE的熔融焓、片晶厚度和亚甲基序列长度等因素。
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| 关 键 词： | 升温淋洗分级 制备 同结晶度 傅立叶红外光谱 支化度 线型低密度聚乙烯 |
| 文章编号： | 1005-5770(2003)09-0004-03 |
| 修稿时间： | 2003年5月26日 |
Preparation of LLDPE Fractions With Different Crystallinity via Temperature Rising Elution Fractionation |
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| KONG Jie,FAN Xiao dong,JIA Mei.Preparation of LLDPE Fractions With Different Crystallinity via Temperature Rising Elution Fractionation[J].China Plastics Industry,2003,31(9):4-6. |
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| Authors: | KONG Jie FAN Xiao dong JIA Mei |
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| Abstract: | Linear low density polyethylene(LLDPE) was fractionated by preparative temperature rising elution fractionation(TREF) according to its crystallinity The fractions were characterized by means of DSC and FTIR in terms of crystallization,melting behaviors and short chain branching The results indicated there was a linear relationship between the crystallinity and the elution temperature,melting point and the elution temperature respectively For each fraction of LLDPE,the crystalline ability,crystallinity and melting point increased gradually with the increase of elution temperature,but the short chain branching of LLDPE decreased There were close relationships,for each fraction,between the fusion enthalpy of crystal,lamellar thickness,ethylene sequence length and its elution temperature respectively |
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| Keywords: | Temperature Rising Elution Fractionation Crystallinity LLDPE Short Chain Branching |
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