私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

當前位置:> 首頁 > 論文著作 > 正文
Biomimetic Self-Deformation of Polymer Interpenetrating Network with Stretch-Induced Anisotropicity
作者:Liu, Ying
關鍵字:COMPOSITE HYDROGELS;ACTUATORS;GRADIENT
論文來源:期刊
發表時間:2021年
The introduction of anisotropicity is the key step of developing stimuli-responsive polymer hydrogels into intelligent devices. Among these anisotropic materials, hydrogels with oriented structures have attracted tremendous attention. However, most of oriented hydrogels are fabricated through aligning nanofillers or microchannels with external fields. In this work, instead of adding inert materials, we report a facile method to fabricate temperature and pH dual-responsive hydrogels with orientated polymer chains. The hydrogels are based on the interpenetrating network (IPN) of poly(acrylic acid) (PAAc) and poly(acrylamide) (PAAm), which can form temperature- and pH-switchable hydrogen bonds (H-bonds). The two polymerized networks are synthesized sequentially, which allows the application of a stretching force on the primary PAAm network and to "memorize" the orientation through the photopolymerization of the secondary PAAc network. Thanks to the aligned polymer chains and the oriented H-bonds, the obtained gels (i.e., PINSIA) exhibit anisotropic volume phase transition in response to temperature and pH. Due to the bilayer structure generated by the photopolymerization, the directions of the internal stresses of these two layers, that is, the bottom and top layer of the PINSIA gels, are perpendicular, driving the gels to form helices when tailored into narrow strips. Furthermore, the helical structure can be programmed by changing the cutting angle and the width of the gel strip and regulated by switching pH and temperature. This work provides a facile method to construct anisotropic hydrogels that can deform into programmable shapes, which could inspire the design and fabrication of smart hydrogels with potential applications as actuators, information carriers, etc.
主站蜘蛛池模板: 湘阴县| 达州市| 澄城县| 奉新县| 襄樊市| 漠河县| 玉田县| 威海市| 万载县| 依安县| 南阳市| 铜梁县| 栖霞市| 梁河县| 繁昌县| 开封市| 右玉县| 临湘市| 淮滨县| 拜泉县| 聂拉木县| 永修县| 三河市| 新野县| 瑞金市| 门源| 天祝| 米林县| 商洛市| 中宁县| 江津市| 南郑县| 遵义市| 屏山县| 缙云县| 阳泉市| 鹤庆县| 高淳县| 基隆市| 巴南区| 天台县|