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| Study on Plasticization Behavior and Hot-pressing Response of Kraft Hardwood Pulp |
| Received:April 06, 2026 Revised:May 08, 2026 |
| DOI：10.11980/j.issn.0254-508X.2026.07.019 |
| Key Words:kraft hardwood pulp plasticizer thermal softening plastic deformation |
| Fund Project: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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| 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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