首页|纤维素纳米纤丝增强导电水凝胶的合成与表征

纤维素纳米纤丝增强导电水凝胶的合成与表征

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
  • 维普
以聚乙烯醇／硼酸盐（ PB）凝胶体系作为导电水凝胶（ ECHs）基本骨架，在纤维素纳米纤丝（ cellulose nanofibers， CNFs）上原位聚合吡咯单体（ Py）得到CNF?PPy复合物，再将其分散到PB基体当中，制得高可塑性和一定自修复特性的纳米复合导电水凝胶（ PB?CNF?PPy）。对胶体化学官能团、微观形貌、晶型结构、流变特性和导电性等性能的测试分析发现：原位聚合过程保持了PPy的共轭结构及其导电性，胶体表面呈蜂窝多孔状，孔隙直径为（4?62±0?05）μm。凝胶平均含水率和密度分别为90?61％和1?13 g／cm3；随着CNF和PPy含量的提高，胶体黏弹性、力学强度和导电性都明显增强。当CNF为2?0％、PPy为0?5％时，存储模量G′可达5?5 kPa，约为纯PB凝胶的70倍，能承受的最大应力约为CNF 1?0％、PPy 0?5％时的8～9倍，电导率可达3?38×10－2 S／m。
Synthesis and characterization of nanocellulose reinforced conductive hydrogel
The PVA/borate (PB) hydrogel was used as the basic skeleton of electro?conductive hydrogels (ECHs). Firstly, the cellulose nanofibers?polypyrrole( CNF?PPy) complex was obtained by in?situ polymerization of the pyrrole monomer in cellulose nanofibers( CNFs) . Then it was dispersed into the PB matrix. A double layer network structure, namely a CNF enhanced network and a PPy conductive network, was constructed in the colloid. A composite conduc?tive hydrogel with high plasticity and self?repairing properties was successfully prepared. The functional groups, micro morphology, crystal structure, rheological properties and electrical conductivity of the hydrogel were characterized. The results showed that the polymerization of PPy and CNF maintained the conjugate structure of PPy and thus its con?ductivity. The hydrogel microstructure presented a honeycomb?like porous structure, and the void diameter was about (4?62±0?05) μm. The average water content of the hydrogel was 90.61% and the average density was 1?13 g/cm3. With the increase of CNF and PPy content, the viscoelasticity and mechanical strength of the hydrogel were signifi?cantly enhanced. When the mass ratio of CNF was 2?0% and PPy was 0?5%, the storage modulus G′was up to 5?5 kPa which was about 70 times of the pure PB. The maximum stress that it could bear was 8-9 times higher than that of the hydrogel with 1.0% CNF and 0?5% PPy. The electrical conductivity reached up to 3?38×10-2 S/m. The ECHs not only has the unique physical and mechanical properties, but also has the electrical properties of conductive polymers. Therefore, the as?prepared ECHs are expected to be applied in the field of conductive films and electrical sensors.

cellulose nanofiberspolyvinyl alcoholpolypyrroleelectroconductive hydrogelin-situ polymerization

韩景泉、丁琴琴、鲍雅倩、李大纲、梅长彤、吴振华、徐信武

展开 >

南京林业大学材料科学与工程学院，南京 210037

浙江德华集团控股股份有限公司，浙江 德清 313200

纤维素纳米纤丝 聚乙烯醇 聚吡咯 导电水凝胶 原位聚合

国家自然科学基金江苏省自然科学基金江苏省高校自然科学研究面上项目2016年度江苏省第五期“333高层次人才培养工程”资助2016年度江苏省高校“青蓝工程”资助

31400505BK2014097514KJB220004

2017

10.13360/j.issn.2096-1359.2017.01.015

林业工程学报
南京林业大学

林业工程学报

CSTPCD北大核心
影响因子：0.742
ISSN：2096-1359
年,卷(期)：2017.2(1)
  • 13
  • 2