快速压致凝固聚乙烯结晶结构的研究

刘成刚; 邵春光; 张瑞静; 张阳; 张豆豆; 王明友; 曹伟; 李倩; 申长雨

doi:10.11858/gywlxb.2014.03.017

快速压致凝固聚乙烯结晶结构的研究

doi: 10.11858/gywlxb.2014.03.017

刘成刚^1,,
邵春光^1,*, ,,
张瑞静¹,
张阳¹,
张豆豆²,
王明友²,
曹伟¹,
李倩¹,
申长雨¹

1.
郑州大学国家橡塑模具工程研究中心，河南郑州 450002
2.
西南交通大学高温高压物理研究所，四川成都 610031

基金项目:

国家自然科学基金 51103138

详细信息

作者简介:
刘成刚(1988—)，男，硕士，主要从事聚合物超高压下结晶结构研究.E-mail:chenggang2030999@sina.com

通讯作者:
邵春光(1982—)，男，博士，副教授，主要从事高分子加工过程中的物理问题研究.E-mail:shaochg@zzu.edu.cn

中图分类号: O521.2
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出版历程
- 收稿日期: 2012-11-21
- 修回日期: 2013-02-19

Study on Crystal Structure of Polyethylene Solidified under Rapid Compression

1.
National Engineering Research Center for Advanced Polymer Processing Technology, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China
2.
Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 利用快速增压、自然冷却和液氮淬冷3种方法对高密度聚乙烯(HDPE)和线性低密度聚乙烯(LLDPE)熔体进行处理，并对凝固样品的微观结构进行了研究。结果表明，由于不受导热系数的限制，快速增压法制备的样品不存在明显的皮芯结构，样品的结晶度分布较均一。和淬冷法相比较，快速增压法也可以有效地抑制聚合物的结晶，特别是对于分子链运动能力较差的高分子材料(LLDPE)，抑制作用更明显。
- 快速增压 /
- 支化度 /
- 皮芯结构 /
- 晶体尺寸
Abstract: High-density polyethylene (HDPE) melt and linear low-density polyethylene (LLDPE) melt were solidified through three kinds of experimental processes, including rapid compressing, natural cooling and quenching, and then the microstructure of samples was investigated.The results show that the crystallinity distribution of rapid compressing samples was more uniform regardless of low thermal diffusivity of polymers, so the "skin-core" type of crystallinity distribution was not found in RC samples.In addition, compared with quenching, rapid compressing can also hinder the crystallization of the polymer melt effectively, especially for LLDPE with low mobility of molecular chains.
- rapid compressing /
- degree of branching /
- skin-core type /
- crystal size

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图 1 (a) 快速增压的装置和(b)样品示意图

Figure 1. (a) The scheme of rapid compressing cell and (b) schematic drawing of samples

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图 2 NC1、RC1、QC1和NC2、RC2、QC2样品的XRD图

Figure 2. XRD patterns of NC1, RC1, QC1 samples and NC2, RC2, QC2 samples

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图 3 (a) NC1、RC1、QC1和(b) NC2、RC2、QC2样品的DSC熔融示意图

Figure 3. DSC thermograms for (a) NC1, RC1, QC1 samples and (b) NC2, RC2, QC2 samples

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图 4 NC1、RC1、QC1和NC2、RC2、QC2样品的偏光照片

Figure 4. POM images of NC1, RC1, QC1 samples and NC2, RC2, QC2 samples

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图 5 距样品表面不同距离的结晶度分布：(a)样品1厚度方向，(b)样品1纬度方向，(c)样品2厚度方向，(d)样品2纬度方向

Figure 5. The relationship between crystallinity and distance to slices from the surface in (a) thickness direction for Sample 1, (b) latitude direction for Sample 1, (c) thickness direction for Sample 2 and (d) latitude direction for Sample 2

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表 1 样品的结晶度和晶体尺寸

Table 1. Crystallinity and crystal size of all samples

Sample	d₁₁₀/(nm)	d₂₀₀/(nm)	X_c/(%)	L/(nm)
NC1	11.0	9.6	67	18.4
RC1	10.5	9.1	58	17.5
QC1	9.9	8.5	53	16.7
NC2	9.4	8.8	46	14.2
RC2	8.4	8.2	35	12.8
QC2	8.7	8.4	38	13.5

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