| PET结晶形态对其微孔发泡材料泡孔结构的影响 |
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| 引用本文： | 龚鹏剑,刘涛,赵玲. PET结晶形态对其微孔发泡材料泡孔结构的影响[J]. 高分子材料科学与工程, 2011, 0(4): 71-74 |
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| 作者姓名： | 龚鹏剑 刘涛 赵玲 |
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| 作者单位： | 化学工程联合国家重点实验室(华东理工大学) |
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| 基金项目： | 新世纪优秀人才计划(NCET-09-0348) |
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| 摘 要： | 以CO2为发泡剂,针对三种具有不同初始结晶形态的聚对苯二甲酸乙二醇酯(PET)原料进行间歇固态发泡的研究.结果表明,CO2的溶胀作用会导致PET晶片的显著增厚,而显著增厚的晶片会使微孔发泡材料的泡孔分布不均匀.但是对孔径和孔密度影响不大.调控PET的发泡条件制备泡孔.结构好的PIT微孔发泡材料方法之一是缩短溶胀时间,在...
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| 关 键 词： | 聚对苯二甲酸乙二醇酯 增厚晶片 超临界CO2发泡 微孔 |
The Effect of PET Crystal Morphology on Cell Structure |
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| Pengjian Gong,Tao Liu,Ling Zhao. The Effect of PET Crystal Morphology on Cell Structure[J]. Polymer Materials Science & Engineering, 2011, 0(4): 71-74 |
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| Authors: | Pengjian Gong Tao Liu Ling Zhao |
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| Affiliation: | (State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China) |
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| Abstract: | Microcellular foaming behavior of polyethylene terephthalate(PET) was investigated in a batch foaming process using CO2 as the foaming agent.PET with different crystalline morphology was used in this work,i.e.,amorphous PET,semicrystalline PET with the melting point of 258.0 ℃ and 263.5 ℃.It was observed that thickened crystals which was formed during the CO2 saturation would have great influence on foam morphology and generate unevenly distributed cells in the bulk.However,cell diameter and cell density were not affected by the formation of thickened crystals.As a result,it is possible to control the foaming conditions to obtain PET foams with evenly distributed cells.One effective method is reduction of the saturation time,then depressurized before the formation of thickened crystals.In this way,good cell morphology,small cell diameter and high cell density PET foams can be generated by depressurization. |
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| Keywords: | PET thickened crystals supercritical CO2 foaming microcellular foams |
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