Conducting Polymer Networks Synthesized by Photopolymerization-Induced Phase Separation
Conducting Polymer Networks Synthesized by Photopolymerization-Induced Phase Separation
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光聚合诱导相分离合成的导电聚合物网络
DOI：
10.1088/2043-6254/aaabae
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发表时间：
2018
影响因子：
--
通讯作者：
Qui TRAN-CONG-MIYATA
中科院分区：
文献类型：
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作者：
Yuki YAMASHITA;Kana KOMORI;Tasuku MURATA;Hideyuki NAKANISHI;Takeshi YAMAO;Qui TRAN-CONG-MIYATA
利用紫外光和可见光交替照射合成了由聚苯乙烯衍生物（PSAF）和聚甲基丙烯酸甲酯（PMMA）构成的双网络聚合物混合物。PSAF网络是通过紫外光照射使PSAF链上标记的蒽（A）部分光二聚而产生的，而PMMA网络是通过甲基丙烯酸甲酯（MMA）单体的光聚合和在维斯光照射下使用乙二醇二甲基丙烯酸酯（EGDMA）的交联反应产生的。研究发现，利用紫外光和维斯光可以独立地诱导和快速控制这些网络的相分离过程。所得共连续形态的特征长度尺度分布可以通过UV和维斯光强度很好地调节。为了确认和利用通过共聚焦显微镜观察到的双连续形态的连接性，将非常少量的0.1重量%的多壁碳纳米管（MWCNT）引入混合物中，并随后检查电流-电压（I-V）关系。初步数据表明，多壁碳纳米管优先分散在PSAF丰富的连续域和整个混合物变得导电，确认所观察到的双连续形态的连接性。在这项研究中获得的实验数据揭示了一种很有前途的方法来设计各种支架进行软物质利用光聚合诱导相分离。
Polymer mixtures composed of double networks of a polystyrene derivative (PSAF) and poly (methyl methacrylate)(PMMA) were alternatively synthesized by using ultraviolet (UV) and visible (Vis) light. The PSAF networks were generated by UV irradiation to photodimerize the anthracene (A) moieties labeled on the PSAF chains, whereas PMMA networks were produced by photopolymerization of methyl methacrylate (MMA) monomer and the cross-link reaction using ethylene glycol dimethacrylate (EGDMA) under Vis light irradiation. It was found that phase separation process of these networks can be independently induced and promptly controlled by using UV and Vis light. The characteristic length scale distribution of the resulting co-continuous morphology can be well regulated by the UV and Vis light intensity. In order to confirm and utilize the connectivity of the bicontinuous morphology observed by confocal microscopy, a very small amount, 0.1 wt%, of multi-walled carbon nanotubes (MWCNTs) was introduced into the mixture and the current–voltage (I–V) relationship was subsequently examined. Preliminary data show that MWCNTs are preferentially dispersed in the PSAF-rich continuous domains and the whole mixture became electrically conducting, confirming the connectivity of the observed bi-continuous morphology. The experimental data obtained in this study reveal a promising method to design various scaffolds for conducting soft matter taking advantages of photopolymerization-induced phase separation.