| 李玉丹,洪小飞.硫酸盐阔叶木浆的塑化行为及其热压响应的研究[J].中国造纸,2026,45(7):174-180 |
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| 硫酸盐阔叶木浆的塑化行为及其热压响应的研究 |
| Study on Plasticization Behavior and Hot-pressing Response of Kraft Hardwood Pulp |
| 收稿日期：2026-04-06 修订日期：2026-05-08 |
| DOI：10.11980/j.issn.0254-508X.2026.07.019 |
| 关键词: 硫酸盐阔叶木浆 增塑剂 热软化 塑性形变 |
| Key Words:kraft hardwood pulp plasticizer thermal softening plastic deformation |
| 基金项目:教育部供需对接就业育人项目（2023122834448）；教育部产学合作协同育人项目（220902557031435）；郑州工业应用技术学院教育教学改革研究项目（JG-230204）。 |
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| 摘要:本研究以硫酸盐阔叶木浆为原料，选用木糖醇和柠檬酸酯类2种增塑剂，结合固体核磁共振和光热红外光谱发现，2种增塑剂在硫酸盐阔叶木浆细胞壁内的分散程度存在明显差异，木糖醇在细胞壁中的分散程度更高，而柠檬酸酯类更易发生相分离。动态力学分析显示，2种增塑剂均能促进纸浆中木质素低温软化过程向低温方向偏移，使木质素软化起始温度由未改性样品的231 ℃降至120 ℃，且改性样品在150~180 ℃范围内出现更明显的损耗响应峰，表明增塑剂的引入促进了细胞壁中木质素相关链段运动，使纸浆可以在低于纤维素热降解的温度区间内进行热加工。热压实验和小角/广角X射线散射分析发现，不同温度下热压均会促进纤维素微结构致密化，但只有当增塑剂存在且加工温度高于木质素低温软化过程的起始温度时，这种聚集才能在不降低纤维素结晶度的前提下发生，表明此时材料更倾向于发生塑性变形，而非伴随严重结构破坏的刚性变形。 |
| Abstract:In this study， kraft hardwood pulp was used as the raw material， and xylitol and citrate ester were selected as two kinds of plasticizers. Solid-state nuclear magnetic resonance and optical photothermal infrared spectroscopy revealed clear differences in the distribution degree of the two kinds of plasticizers in the cell walls of kraft hardwood pulp. Xylitol exhibited a higher dispersion degree in the cell walls， whereas the citrate ester was more prone to phase separation. Dynamic mechanical analysis showed that both plasticizers shifted the low-temperature softening process of lignin in the pulp towards lower temperatures.The initial softening temperature of lignin was reduced from 231 ℃ for the unmodified sample to 120 ℃. The modified samples also displayed more pronounced loss-response peaks in the range of 150~180 ℃， indicating that the introduction of plasticizers enhanced the mobility of lignin-related chain segments in the cell walls and enabled thermal processing of the pulp at temperatures below the thermal degradation range of cellulose. Hot-pressing experiments and small-angle wide angle X-ray scattering analysis further showed that hot-pressing at different temperatures promoted cellulose microstructure densification. However， only in the presence of plasticizers and when the processing temperature exceeded the onset temperature of low-temperature lignin softening could such aggregation occur without reducing cellulose crystallinity. Under these conditions， the material was more likely to undergo plastic deformation rather than rigid deformation accompanied by severe structural damage. |
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