Thermal and electrical properties of nanocellulose films with different interfibrillar structures of alkyl ammonium carboxylates
Thermal and electrical properties of nanocellulose films with different interfibrillar structures of alkyl ammonium carboxylates
复制标题
不同烷基羧酸铵纤维间结构的纳米纤维素膜的热电性能
DOI：
10.1007/s10570-018-2155-y
复制
发表时间：
2018
期刊：
影响因子：
5.7
通讯作者：
Isogai Akira
中科院分区：
文献类型：
--
作者：
Shimizu Michiko;Kusumi Ryosuke;Saito Tsuguyuki;Isogai Akira
具有高模量和低热膨胀系数的透明纳米纤维素薄膜作为包装薄膜或柔性电子器件的衬底受到了广泛的关注。本文研究了含季烷基铵羧酸盐的2,2,6,6-四甲基哌啶-1-氧基氧化CNF （T-CNF）薄膜的热学和电学性质。随着烷基链长度的增加，T-CNF薄膜的热分解温度和导热系数降低。四丙基羧酸铵和四丁基羧酸铵的T-CNF膜的表面电阻率分别提高到1.2 × 109和1.5 × 1010Ω sq−1。这些结果表明，QAs的迁移率随着烷基链长度的增加而增加。利用小角度x射线散射评估，薄膜内T-CNFs之间的距离随着QAs的烷基链长度的增加而增加。对T-CNF薄膜的固态13c交叉极化/魔角自旋核磁共振分析表明，羧酸盐与QAs之间的离子键强度随着QA烷基链长度的增加而降低。随着烷基链长度的增加，QAs的甲基和亚甲基碳的弛豫时间增加。这项研究表明，T-CNF薄膜的热、电和结构性能可以通过使用羧酸离子交换过程来控制T-CNF的纤维间结构。
Transparent films of cellulose nanofibrils (CNFs) with high moduli and low thermal expansion coefficients have attracted significant attention for use as packaging films or as substrates for flexible electronics. In the present study, the thermal and electrical properties of 2,2,6,6-tetramethylpiperidine-1-oxyl radical-oxidized CNF (T-CNF) films with quaternary alkyl ammonium (QAs) carboxylates were characterized. As the alkyl chain length of the QAs was increased, the thermal decomposition temperature and thermal conductivity of the T-CNF films decreased. The surface resistivities of T-CNF films with tetrapropylammonium and tetrabutylammonium carboxylates were increased up to 1.2 × 109and 1.5 × 1010Ω sq−1, respectively. These results indicate that the mobility of the QAs was increased with an increase in their alkyl chain length. The distances between the T-CNFs inside the films, evaluated using small-angle X-ray scattering, increased as the alkyl chain length of the QAs was increased. Solid-state13C cross-polarization/magic-angle spinning nuclear magnetic resonance analyses of the T-CNF films showed that the strength of the ionic bonds between the carboxylates and the QAs decreased with increasing QA alkyl chain lengths. The relaxation times of the carbons of the methyl and methylene groups of the QAs increased as the alkyl chain length of the QAs was increased. This study shows that the thermal, electrical, and structural properties of the T-CNF films can be controlled by the interfibrillar structures of the T-CNFs using a carboxylate ion-exchange process.
登录
查看更多内容
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
Takumi Okada;Kojiro Uetani;Hideko T. Oyama
通讯作者：
Hideko T. Oyama
影响因子：
11.4
作者：
Carpenter AW;de Lannoy CF;Wiesner MR
通讯作者：
Wiesner MR
由纤维素纳米纤丝与羧酸烷基季铵的水分散体制备的疏水性和延展性薄膜
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
Shimizu;M.;Saito;T.;Fukuzumi;H.;Isogai;A.
通讯作者：
A.
影响因子：
6.2
作者：
Saito, Tsuguyuki;Nishiyama, Yoshiharu;Isogai, Akira
通讯作者：
Isogai, Akira