rGO@PU柔性泡沫的冻干法制备及其压阻性能  

Preparation of rGO@PU flexible foam by freeze-drying and its piezoresistive properties

作　　者：皇甫微微 杨雷[1,2] 沈一峰[1] 赵强强 冯如 HUANGFU Weiwei;YANG Lei;SHEN Yifeng;ZHAO Qiangqiang;FENG Ru(College of Materials and Textiles,Minstry of Education, Zhejiang Sci-Tech University,Hangzhou 310018,China;Key Laboratory of Advanced Textile Materials and Manufacturing Technology,Minstry of Education,Zhejiang Sci-Tech University,Hangzhou 310018,China;Non-woven Project Department of Transfar Zhilian Co.,Ltd.,Hangzhou 311215,China)

机构地区：[1]浙江理工大学材料与纺织学院,杭州310018 [2]浙江理工大学先进纺织材料与制备技术教育部重点实验室,杭州310018 [3]传化智联股份有限公司无纺布项目部,杭州311215

出　　处：《浙江理工大学学报（自然科学版）》2019年第5期623-630,共8页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(201606206);浙江省自然科学基金项目(LY18E030008)

摘　　要：具有多孔结构的传感材料因可赋予器件轻质、高柔性以及穿着舒适性等优点,已成为近年来的研究热点。以聚氨酯(PU)乳胶粒作为皮克林(Pickering)粒子,引入氧化石墨烯(GO)作为导电填料,制备“水包油(O/W)”型的高内相乳液(HIPE)液态模板;将乳液模板经冷冻干燥成型后,以抗坏血酸(VC)还原成型材料中的GO,得到具有压阻响应性的柔性导电聚合物泡沫(rGO@PU)。分别考察了PU粒子浓度以及GO浓度对rGO@PU形貌、力学性能以及压阻性能的影响。结果表明:PU可用作Pickering粒子,稳定“环己烷/水”HIPE,同时PU低的玻璃化转变温度赋予材料柔性;随着PU粒子浓度的降低,材料孔径增大,模量降低;提高GO浓度,材料孔径变化不大,但模量增高;材料的灵敏度、应力量程则可通过改变PU和GO的浓度进行调控。Sensing materials with porous structure have become a research hotspot in recent years because of its advantages such as light weight, high flexibility and wearing comfort. Polyurethane(PU) emulsion particles were used as Pickering particles, and graphene oxide(GO0 was introduced as the conductive filler to prepare "water in oil(O/W)" high internal phase emulsion(HIPE) liquid template. After the emulsion template was freeze-dried,the GO in the molding material was reduced with ascorbic acid(VC) to obtain the flexible conductive polymer foam(rGO@PU) with piezoresistive responsiveness. The effects of PU particle concentration and GO concentration on the morphology, mechanical properties and piezoresistive properties of rGO@PU were investigated.The results showed that PU could be used as Pickering particles to stabilize "cyclohexane/water" HIPE, and the low glass-transition temperature of PU gave the material excellent flexibility. With the decrease of PU particle concentration, the pore size of material increased and modulus decreased. With the increase of GO concentration, the pore size of material did not change much, but the modulus increased. Moreover, the sensitivity and stress range of material could be controlled by changing the concentration of PU and GO.

关 键 词：柔性导电聚合物泡沫 压阻效应 氧化石墨烯 高内相乳液 聚氨酯乳胶粒 

分 类 号：O632.52[理学—高分子化学]