The development of lignocellulose-based bioplastic is still a challenge mainly due to their high crystallinity and extensive hydrogen bond network. Sustainable modification strategies are thus essential and vital currently. Here, we proposed a thermoplasticization process by combining carboxylation and subsequent grafting with quaternary ammonium based on electrostatic interaction. Continuous steam exploded sisal fibers (SFs) was firstly carboxylated with periodate and sodium chlorite, and then grafted with cetyl trimethyl ammonium bromide (CTAB). A higher yield (∼90 %) of carboxylated SFs (CSFs) at a lower dosage of periodate was achieved, which implied the cost-effective of this strategy. The CSFs grafted with CTAB (CCSFs) showed an obvious secondary relaxation between 50 – 90 °C, and could be hot-pressed into transparent sheets. The tensile strength of hot-pressed sheet reached a maximum of 27.8 MPa at the weight ratios of 0.2 (periodate/SFs) and 1.0 (CTAB/CSFs). The interface bonding between CCSFs was investigated by scanning electron microscope and atomic force microscope, which revealed the effect mechanism of the dosage of periodate and CTAB on mechanical properties of hot-pressed sheets. This strategy represents a potential green and sustainable route to produce lignocellulose-based bioplastic in industry.

基于木质纤维素的生物塑料的开发仍然是一个挑战，主要是由于它们的高结晶度和广泛的氢键网络。因此，可持续的改造战略目前是必不可少的和至关重要的。在这里，我们提出了一种基于静电相互作用将羧化和随后与季铵接枝相结合的热塑性化工艺。连续蒸汽爆破剑麻纤维（SFs）首先用高碘酸盐和亚氯酸钠羧化，然后用十六烷基三甲基溴化铵（CTAB）接枝。在较低剂量的高碘酸盐下获得了较高的羧化 SFs (CSFs) 产率 (~90%)，这意味着该策略具有成本效益。CTAB（CCSFs）接枝的CSFs在50-90°C之间表现出明显的二次弛豫，可以热压成透明片。当重量比为 0.2（高碘酸盐/SFs）和 1.0（CT​​AB/CSFs）时，热压片材的拉伸强度最高可达 27.8 MPa。通过扫描电子显微镜和原子力显微镜研究了CCSFs之间的界面结合，揭示了高碘酸盐和CTAB用量对热压板力学性能的影响机制。该策略代表了在工业中生产基于木质纤维素的生物塑料的潜在绿色和可持续途径。