乙烯-1-辛烯嵌段共聚物交联改性与混合气体发泡技术的协同效应研究
PDF下载 (132)王越铭,赵宝艳,张 利.乙烯-1-辛烯嵌段共聚物交联改性与混合气体发泡技术的协同效应研究[J].宁波大学学报(理工版),2025,38(5):86-95.DOI: 10.20098/j.cnki.1001-5132.2025.0302
WANG Yueming,ZHAO Baoyan,ZHANG Li.Synergistic effect of crosslinking modification and mixed gas foaming technology on olefin block copolymer[J].Journal of Ningbo University(Natural Science & Engineering Edition),2025,38(5):86-95.DOI: 10.20098/j.cnki.1001-5132.2025.0302
| Title: | Synergistic effect of crosslinking modification and mixed gas foaming technology on olefin block copolymer |
| 作者: | 王越铭, 赵宝艳, 张 利 |
| Author(s): | WANG Yueming, ZHAO Baoyan, ZHANG Li |
| 关键词: | 超临界发泡; 乙烯-1-辛烯嵌段共聚物; 交联改性; 混合气体 |
| Keywords: | supercritical foaming; olefin block copolymer; crosslinking modification; mixed gas |
| 分类号: | TQ328.1 |
| DOI: | 10.20098/j.cnki.1001-5132.2025.0302 |
| 文献标识码: | A |
| 摘要: | 乙烯-1-辛烯嵌段共聚物（OBC）具有独特的嵌段结构，展现出优异的热力学稳定性和回弹性，被视为制备高性能微孔泡沫的理想基体材料。然而，OBC材料存在发泡倍率低、尺寸稳定性差等问题。为此，采用过氧化物交联剂（二叔丁基过氧化异丙基苯（BIPB））对OBC进行交联改性，结合N2/CO2混合气体发泡技术，研究交联程度及发泡气体组成对OBC发泡性能的影响。结果表明，微交联结构（OBC-0.2B）可以显著提高OBC的熔体强度，拓宽发泡温度范围。在纯N2气体条件下，OBC-0.2B样品的发泡倍率达12.9倍，表现出良好的发泡性能和尺寸稳定性。使用N2/CO2混合气体时，发泡效果进一步优化，当CO2分压占比为25%时，发泡倍率提升至16.5倍，并在高发泡倍率与抗收缩性之间达到最佳平衡。该成果为OBC在高性能聚烯烃泡沫材料的开发以及其他热塑性弹性体的发泡改性研究提供了新思路。 |
| Abstract: | Olefin block copolymer (OBC), with its unique block structure, exhibits excellent thermodynamic stability and resilience, making it an ideal candidate for foam materials. However, it faces challenges such as low expansion ratio and poor dimensional stability. To address these issues, OBC was crosslinked using di-tert-butyl peroxide isopropyl benzene (BIPB) as a peroxide-based crosslinking agent, and the effects of crosslinking degree and foaming gas composition on the foaming performance of OBC were systematically investigated, with N2/CO2 mixed gas foaming technology being exploited. The results demonstrate that moderate crosslinking (OBC-0.2B) can significantly enhance the melt strength of OBC and broaden its foaming temperature window. Under pure N2 gas condition, the OBC-0.2B sample achieved a foaming expansion ratio of 12.9, exhibiting excellent foaming performance and dimensional stability. When using N2/CO2 mixed gas, the foaming performance was further optimized. At a CO2 content of 25%, the expansion ratio increased to 16.5, while maintaining excellent anti-shrinkage properties, achieving an optimal balance between high expansion ratio and shrinkage resistance. These findings provide new insights for the development of high-performance polyolefin foam materials based on OBC, as well as for the foaming modification of other thermoplastic elastomers. |
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| 备注/Memo: | 收稿日期：2025−03−04 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ 基金项目：宁波高新区重大科技专项（2024CX050003）；宁波市“科创甬江2035”科创生态育成计划项目（2024Z035） 第一作者：王越铭，硕士研究生，主要研究方向为高分子轻量化。E-mail: 574689058@qq.com *通信作者：张 利，博士/教授，主要研究方向为高分子轻量化。E-mail: zhangli2@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
