Reactive melt-grafting of maleic anhydride onto olefin block copolymer toward high-performance polar polyolefin thermoplastic elastomer

IF 2.9 4区 化学 Q2 POLYMER SCIENCE
Yu Kou, Yuqi Ma, Jialiang Li, Shilong Zhang, Jiaxun Cao, Hua Deng, Yanling Zhu, Yongsheng Zhao, Jianbin Qin, Guangcheng Zhang
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Abstract

The block structure of olefin block copolymer (OBC) elastomer gives it good elasticity and heat resistance relative to other polyolefin elastomers. However, the non-polar nature of OBC chains limits its comprehensive properties like dyeing and toughening for polar engineering plastics. In this work, maleic anhydride (MA) and dicumyl peroxide (DCP) were selected as a typical polar monomer and a radical initiator to modify the polarity of OBC elastomer. During the melt-grafting process, the DCP content was tuned to optimize the grafting efficiency while the MA-to-OBC ratio was fixed at 5 wt%. It was found that all the melt-grafting reactions show high efficiency and can be finished in 3 min at 170 °C. With the increase of DCP content, the estimated grafting degree of OBC-g-MA elastomer increases from 0.40% to 1.16% along with increased gel content from 4.27% to 22.44%. A suitable grafting process was obtained with a DCP content of 3.0 wt% by balancing grafting efficiency and final mechanical properties. The optimized OBC-g-MA elastomer with a grafting degree of 0.92% has a mechanical strength of 17.15 MPa, a Young's modulus of 26.35 MPa, elongation of 1564% and strain recovery of 59.73%. Additionally, the contact angle test shows that polar grafting can increase surface hydrophilicity while excessive crosslinking promotes hydrophobicity. Therefore, our work has demonstrated the feasibility of the reactive melt-grafting method to prepare OBC-g-MA elastomer and can also provide a processing reference for other chemical functionalization of polyolefin thermoplastic elastomers. © 2024 Society of Industrial Chemistry.

Abstract Image

将马来酸酐反应性熔融接枝到烯烃嵌段共聚物 (OBC) 上,形成高性能极性聚烯烃热塑性弹性体
与其他聚烯烃弹性体相比,烯烃嵌段共聚物(OBC)弹性体的嵌段结构使其具有良好的弹性和耐热性。然而,OBC 链的非极性限制了其在极性工程塑料中的染色和增韧等综合性能。本研究选择马来酸酐(MA)和过氧化二异丙苯(DCP)作为典型的极性单体和自由基引发剂来改变 OBC 弹性体的极性。在熔融接枝过程中,调整 DCP 的含量以优化接枝效率,同时将 MA 与 OBC 的比例固定为 5 wt%。研究发现,所有熔融接枝反应都表现出高效率,在 170 °C 下 3 分钟内即可完成。随着 DCP 含量的增加,OBC-g-MA 弹性体的估计接枝度从 0.40% 增加到 1.16%,凝胶含量从 4.27% 增加到 22.44%。通过平衡接枝效率和最终机械性能,在 DCP 含量为 3.0 wt% 时获得了合适的接枝工艺。接枝度为 0.92% 的优化 OBC-g-MA 弹性体的机械强度为 17.15 兆帕,杨氏模量为 26.35 兆帕,伸长率为 1564%,应变恢复率为 59.73%。此外,接触角测试表明,极性接枝可增加表面亲水性,而过度交联则会增加疏水性。因此,我们的工作证明了反应熔融接枝法制备 OBC-g-MA 弹性体的可行性,也可为聚烯烃热塑性弹性体的其他化学功能化提供加工参考。本文受版权保护。
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来源期刊
Polymer International
Polymer International 化学-高分子科学
CiteScore
7.10
自引率
3.10%
发文量
135
审稿时长
4.3 months
期刊介绍: Polymer International (PI) publishes the most significant advances in macromolecular science and technology. PI especially welcomes research papers that address applications that fall within the broad headings Energy and Electronics, Biomedical Studies, and Water, Environment and Sustainability. The Journal’s editors have identified these as the major challenges facing polymer scientists worldwide. The Journal also publishes invited Review, Mini-review and Perspective papers that address these challenges and others that may be of growing or future relevance to polymer scientists and engineers.
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