Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395, Japan.
Department of Wood Science and Forest Product, Virginia Tech, Blacksburg, Virginia 24061, United States.
J Colloid Interface Sci. 2015 Feb 15;440:119-25. doi: 10.1016/j.jcis.2014.10.071. Epub 2014 Nov 6.
Chemical incompatibility and relatively weak interaction between lignocellulosic fibers and synthetic polymers have made studies of wood fiber-thermoplastic composite more challenging. In this study, adsorption of 2-hydroxypropyltrimethylammonium xylans onto rod-like cellulose nanocrystals are investigated by zeta-potential measurements, and polarized and depolarized dynamic light scattering as a factor for better understanding of lignocellulosic fibers and cellulose nanocrystals. Zeta-potential measurements show xylan derivative adsorption onto cellulose nanocrystals. Decay time distributions of the ternary system and binary system from dynamic light scattering show that aggregates exist in the binary system and they disappear in the ternary system. At low 2-hydroxypropyltrimethylammonium xylan concentrations relative to that of cellulose nanocrystal, xylan derivatives adsorbed onto some of the cellulose nanocrystal. Hence, more xylan derivatives adsorbed onto cellulose nanocrystal increased with increasing xylan derivative concentration. Also, the concentration dependence of the ratio of the rotational diffusion coefficient to the translational diffusion coefficient revealed a strong adsorptive interaction between xylan derivatives and the cellulose nanocrystals.
木质纤维与合成聚合物之间的化学不相容性和相对较弱的相互作用，使得木材纤维-热塑性复合材料的研究更加具有挑战性。在这项研究中，通过动电位测量和偏振和去偏振动态光散射研究了 2-羟丙基三甲基氯化铵木聚糖在棒状纤维素纳米晶体上的吸附，这是更好地理解木质纤维和纤维素纳米晶体的一个因素。动电位测量表明木聚糖衍生物吸附在纤维素纳米晶体上。动态光散射的三元体系和二元体系的衰减时间分布表明，在二元体系中存在聚集体，而在三元体系中它们消失了。在 2-羟丙基三甲基氯化铵木聚糖的浓度相对于纤维素纳米晶体的浓度较低的情况下，木聚糖衍生物吸附在一些纤维素纳米晶体上。因此，随着木聚糖衍生物浓度的增加，更多的木聚糖衍生物吸附在纤维素纳米晶体上。此外，旋转扩散系数与平移扩散系数之比的浓度依赖性表明木聚糖衍生物与纤维素纳米晶体之间存在强烈的吸附相互作用。
