Abstract

The aim of this study is to evaluate the properties of bio-based composite films prepared from nano/microfibrillated cellulose and calcium carbonate. In addition, a preliminary assessment to investigate the possibility of using such a system as a binder for lignocellulosic materials was conducted. Microfibrillated cellulose/calcium carbonate composite (50:50) produced by FiberLean^® Technologies UK (hereafter referred to as FLC) was used as the source of calcium carbonate. The three tested composite systems were pure CNF films and films containing 25 wt% and 50 wt% calcium carbonate. The morphology of the films assessed by scanning electron microscopy and energy-dispersive spectroscopy demonstrated the uniform distribution of calcium carbonate on the film surface and in the z-direction. The mechanical properties showed no significant difference between pure CNF films and films containing 25 wt% calcium carbonate (as opposed to films prepared with 50 wt% mineral load). Lap shear testing showed no significant difference between the three tested samples indicating that the presence of calcium carbonate particles did not inhibit the binding properties of CNFs. The presence of calcium carbonate increased the thermal stability of the films. During dewatering analysis, a 25 wt% calcium carbonate load resulted in a maximized retention and a consistent dewatering behavior. At 50 wt% mineral load, the maximum retention obtained was 94% and inconsistent dewatering pattern was observed.

中文翻译：

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混杂复合体系中纤维素纳米原纤维与碳酸钙的协同作用

摘要

这项研究的目的是评估由纳米/微纤化纤维素和碳酸钙制备的生物基复合膜的性能。另外，进行了初步评估以调查使用这种系统作为木质纤维素材料的粘合剂的可能性。通过FiberLean产生微原纤化纤维素酯/钙复合物（50:50）^®英国技术公司（以下简称FLC）用作碳酸钙的来源。三种测试的复合体系是纯CNF薄膜和含有25 wt％和50 wt％碳酸钙的薄膜。通过扫描电子显微镜和能量分散光谱法评估的膜的形态表明碳酸钙在膜表面和z方向上的均匀分布。机械性能显示纯CNF膜和含25 wt％碳酸钙的膜（相对于含50 wt％矿物质负载的膜）没有显着差异。搭接剪切测试显示三个测试样品之间没有显着差异，表明碳酸钙颗粒的存在不会抑制CNF的结合特性。碳酸钙的存在增加了膜的热稳定性。在脱水分析过程中，添加25 wt％的碳酸钙会导致最大程度的保留和一致的脱水行为。在50％的矿物质负载下，获得的最大保留率为94％，并且观察到不一致的脱水模式。