Department of Fiber Science & Apparel Design, Cornell University, Ithaca NY 14850, USA.
Department of Chemistry & Chemical Biology, Cornell University, Ithaca NY 14850, USA.
Carbohydr Polym. 2017 Oct 15;174:626-632. doi: 10.1016/j.carbpol.2017.06.092. Epub 2017 Jun 23.
A thermo-responsive polymer with hydrophilic to hydrophobic transition behavior, poly(vinyl caprolactam-co-hydroxyethyl acrylamide) P(VCL-co-HEAA), was prepared by copolymerization of vinyl caprolactam and N-hydroxyethyl acrylamide via free radical solution polymerization. The resulting copolymer was characterized by Fourier transform infrared spectroscopy (FTIR), H nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The lower critical solution temperature (LCST) of P(VCL-co-HEAA) was determined at 34.5°C. This thermo-responsive polymer was then grafted onto cotton fabrics using 1,2,3,4-butanetetracarboxylic acid (BTCA) as crosslinker and sodium hypophosphite (SHP) as catalyst. FTIR and energy dispersive X-ray spectroscopy (EDS) studies confirmed the successful grafting reaction. The modified cotton fabric exhibited thermo-responsive behavior as evidenced by water vapor permeability measurement confirming decreased permeability at elevated temperature. This is the first demonstration that a PVCL based copolymer is grafted to cotton fabrics. This study provides a new thermo-responsive polymer for fabrication of smart cotton fabrics with thermally switchable hydrophilicity.
一种具有亲水性到疏水性转变行为的温敏聚合物，聚（己内酰胺-co-羟乙基丙烯酰胺）P（VCL-co-HEAA），通过自由基溶液聚合由己内酰胺和 N-羟乙基丙烯酰胺共聚合成。所得共聚物通过傅里叶变换红外光谱（FTIR）、氢核磁共振（NMR）、凝胶渗透色谱（GPC）、差示扫描量热法（DSC）和热重分析（TGA）进行了表征。P（VCL-co-HEAA）的低临界溶液温度（LCST）在 34.5°C 下确定。然后，使用 1,2,3,4-丁烷四羧酸（BTCA）作为交联剂和次磷酸钠（SHP）作为催化剂将这种温敏聚合物接枝到棉织物上。FTIR 和能谱（EDS）研究证实了接枝反应的成功。改性棉织物表现出温敏行为，水蒸气透过率测量证实其在升高的温度下透过率降低。这是首次证明基于 PVCL 的共聚物接枝到棉织物上。该研究为制备具有热致切换亲水性的智能棉织物提供了一种新型温敏聚合物。
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