纳米纤维素-聚吡咯/天然橡胶柔性导电弹性体的制备与性能

Preparation and characterization of cellulose nanofibers-polypyrrole/natural rubber flexible conductive elastomer

以纤维素纳米纤丝(Cellulose nanofibrils,CNFs)为生物模板,将聚吡咯(Polypyrrole,PPy)原位聚合在CNFs表面,再将CNF-PPy复合物均匀分散到天然橡胶(Natural rubber,NR)弹性基体中,制备了具有高柔韧性的纳米纤维素-聚吡咯/天然橡胶(CNF-PPy/NR)导电弹性体。结果表明:CNFs可协助PPy在NR基体中形成三维导电网络结构,并提高弹性体的力学性能和导电性能,有效降低其逾渗阈值。当添加质量比为5%(以橡胶质量为基准,下同)的CNF和20%的PPy时,CNF-PPy/NR的拉伸强度可达(8.97±0.92)MPa,分别约为PPy/NR及纯NR的1.56倍和9.54倍,电导率可达(0.134±0.063)S/m;在0.3A/g的电流密度下,比电容可达96F/g,并在1.0A/g电流密度下循环充放电1 200次后,比电容仍可保持其初始值的72%。此导电弹性体具有良好的力学强度和电学性能,有望应用于柔性有机电子器件领域。

Polypyrrole（PPy）was in-situ polymerized on the surface of biological template—cellulose nanofibers（CNFs）to form the CNF-PPy complexes,which further were uniformly dispersed into natural rubber（NR）elastomeric matrix to prepare CNF-PPy/NR conductive elastomers with high flexibility.The results show that CNFs can assist PPy to form a three-dimensional network structure in NR matrix,improve the mechanical properties and electrical conductivity of elastomers,and reduce the percolation threshold effectively.When adding 5% CNF（rubber mass as 100）and 20%PPy,the tensile strength of CNF-PPy/NR is（8.97±0.92）MPa,which is about 1.56 times of PPy/NR and 9.54 times of pure NR,respectively,and the conductivity is up to（0.134±0.063）S/m;At0.3 A/g current density,the specific capacitance can reach 96 F/g,and it can still maintain its initial value of 72%in the cycle of charge and discharge 1 200 times with 1.0 A/g current density.The conductive elastomer exhibits good mechanical and electrical properties,which is expected to be applied in the field of flexible organic electronic devices.