Strategies to hydrophilize silicones via spontaneous adsorption of poly(vinyl alcohol) from aqueous solution
Strategies to hydrophilize silicones via spontaneous adsorption of poly(vinyl alcohol) from aqueous solution
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通过从水溶液中自发吸附聚乙烯醇来亲水化有机硅的策略
DOI：
10.1016/j.colsurfa.2018.03.024
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Chen, Wei
中科院分区：
文献类型：
--
作者：
Yan, Yan;Qi, Yueyue;Chen, Wei
通过聚二甲基硅氧烷（PDMS）的表面改性来实现持久的亲水性具有挑战性，这主要是由于发生疏水性恢复。这涉及低分子量物质从本体迁移到表面，并由界面自由能的减少驱动。本研究在 Sylgard PDMS 薄膜及其改性衍生物上进行了聚（乙烯醇）的自发吸附。 PDMSox1s、PDMSox60s 和 PDMSox60s+2k 分别通过 1 s 氧等离子体、60 s 氧等离子体和 60 s 氧等离子体制备，然后将 2kDa 分子量的线性 PDMS 共价附着在 PDMS 薄膜上。通过光学和原子力显微镜表征表面形态，并通过动态水接触角测量来监测亲水性。结果发现，由于缺乏疏水性驱动力，PDMSox60s 上发生的 PVOH 吸附可以忽略不计，并且 PDMS 和 PDMSox1s 上广泛的 PVOH 薄膜去湿导致亲水性改善不显着。然而，在PDMSox60s+2k上获得了尽管有一些小孔的连续PVOH薄膜。 PDMSox60s+2k-PVOH 的前进和后退接触角为 80–90°/16±2°，明显低于未改性 PDMS 的 123±5°/97±2°。还测量了一系列静态接触角，其中一些低于文献报道的值。 PDMSox60s+2k-PVOH 系统表现出优异的长期稳定性和水解稳定性，这是由于通过在亲水性、等离子体氧化的 PDMS 本体和亲水性 PVOH 外部之间插入疏水性 PDMS 层，消除了疏水性恢复的驱动力。这是解决亲水性有机硅疏水性恢复的新概念。吸附过程的自发性和 PVOH 阻挡层的结晶度是本研究证明的其他优点。
It is challenging to achieve long-lasting hydrophilicity by surface modification of polydimethylsiloxane (PDMS), principally due to the hydrophobic recovery that occurs. This involves the migration of low molecular weight species from the bulk to the surface and is driven by the reduction of interfacial free energy. In this study, spontaneous adsorption of poly(vinyl alcohol) was carried out on Sylgard PDMS films and their modified derivatives. PDMSox1s, PDMSox60s, and PDMSox60s+2kwere prepared by 1-s oxygen plasma, 60-s oxygen plasma, and 60-s oxygen plasma followed by covalent attachment of linear PDMS of 2 kDa molecular weight on PDMS films, respectively. Surface morphology was characterized by optical and atomic force microscopy and hydrophilicity was monitored by dynamic water contact angle measurements. It was found that negligible PVOH adsorption takes place on PDMSox60sdue to the lack of hydrophobic driving force and that extensive PVOH thin film dewetting on PDMS and PDMSox1sresults in insignificant improvement in hydrophilicity. However, a continuous PVOH thin film albeit with some small holes was obtained on PDMSox60s+2k. PDMSox60s+2k-PVOH exhibits advancing and receding contact angles of 80–90°/16 ± 2°, which are significantly lower than 123 ± 5°/97 ± 2° on unmodified PDMS. A range of static contact angles were also measured, some of which are lower than those reported in the literature. The PDMSox60s+2k-PVOH system demonstrates superior long-term and hydrolytic stability, which are attributed to the removal of the driving force for hydrophobic recovery by inserting a hydrophobic PDMS layer between a hydrophilic, plasma-oxidized, PDMS bulk and a hydrophilic PVOH exterior. This is a new concept in addressing hydrophobic recovery of hydrophilized silicones. The spontaneous nature of the adsorption process and the crystallinity of the PVOH barrier layer are the other advantages demonstrated in this study.
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影响因子：
5.5
作者：
B. Coupe;Wei Chen
通讯作者：
B. Coupe;Wei Chen
有机硅及其用途
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
R. McGregor
通讯作者：
R. McGregor
环境温度对硅橡胶复合材料疏水恢复行为的影响
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
Xiangyang Peng;Li Zijian;Feng Zheng;Ni Zhang;Zhen Huang;P. Fang
通讯作者：
P. Fang
影响因子：
8.4
作者：
Eddington, DT;Puccinelli, JP;Beebe, DJ
通讯作者：
Beebe, DJ
影响因子：
7.9
作者：
Trantidou, Tatiana;Elani, Yuval;Ces, Oscar
通讯作者：
Ces, Oscar