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研究以等规聚丙烯(isotactic Polypropylene，iPP)与无规共聚聚丙烯(Polypropylene Random，PPR)为原料，通过熔喷纺丝制备不同质量比的iPP/PPR复合纤维，采用差示扫描量热、X射线衍射和扫描电子显微镜表征纤维的结晶行为、晶体结构及微观形貌，并利用动态穿透试验和静态吸附试验评价其对C2～C5轻烃的吸附性能。结果显示，PPR的加入会抑制晶体生长，当PPR质量分数为50%时，纤维的结晶度最低，吸附质量比达到峰值。该吸附过程更贴合Freundlich模型特征，表明纤维表面为非均相吸附环境。此外，研究结合汉森溶解度参数、不同轻烃分压吸附数据与纤维直径变化，揭示吸附过程遵循吸附—溶解—扩散机制，其中轻烃分子以溶解方式进入无定形区并引起纤维溶胀，无定形区为轻烃分子提供了充足的溶解与扩散空间，结晶区维持了纤维的力学支撑。
Abstract：This study aims to investigate the effect of crystalline state on the adsorption performance of light hydrocarbons using iPP/PPR melt-blown fibers， and to develop high-efficiency polypropylene-based adsorbents for C₃–C₅ light hydrocarbon volatile organic compounds. A series of composite melt-blown fibers were prepared via melt-blown spinning technology by blending isotactic polypropylene (iPP) with polypropylene random copolymer (PPR) in five mass ratios: 100:0， 60:40， 50:50， 40:60， and 30:70. Differential Scanning Calorimetry (DSC)， X-ray Diffraction (XRD)， and Scanning Electron Microscopy (SEM) were employed to characterize the crystallization behavior， crystal structure， and microscopic morphology of all fiber samples. Dynamic adsorption tests were conducted to obtain breakthrough curves and calculate the saturated adsorption capacity of each sample. Static adsorption experiments at 25 °C were performed across multiple concentration gradients， with the experimental data fitted to both Langmuir and Freundlich adsorption isotherm models. The results indicate that the incorporation of PPR disrupts the regular arrangement of iPP molecular chains and restricts crystal growth. The overall crystallinity of the blended system initially decreases and then increases with rising PPR content. Pure isotactic polypropylene melt-blown fiber exhibits extremely poor adsorption capacity for light hydrocarbons; however， the composite fiber achieves a maximum adsorption capacity of 44.82 mg/g at a PPR mass fraction of 50%. Excessive PPR content leads to flattened and fractured fibers， blocking gas mass transfer channels and reducing adsorption performance. The adsorption process aligns well with the Freundlich model， indicating that the fiber surface presents a heterogeneous adsorption environment. Coupled with analyses of Hansen solubility parameters， adsorption tests under varying partial pressures of light hydrocarbons， and assessments of fiber diameter variations， it is confirmed that the adsorption follows the solution-diffusion mechanism. The amorphous regions of polypropylene predominantly drive the adsorption behavior， while the crystalline regions primarily function to support and maintain the integrity of the fiber network structure. In conclusion， optimizing the two-component ratio can effectively balance the crystallinity and structural integrity of melt-blown fibers. The optimal mass ratio of iPP to PPR is identified as 50/50， significantly enhancing the material's adsorption capacity for light hydrocarbons. This research provides a theoretical framework for the structural design and performance optimization of polypropylene melt-blown fiber adsorbents.
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基本信息:
DOI：10.13637/j.issn.1009-6094.2026.0630
中图分类号:TQ342.94;TQ424;X701
引用信息:
[1]王北福,韩乐瑶,戚文星,等.iPP/PPR熔喷纤维结晶状态对轻烃吸附性能影响研究[J].安全与环境学报().DOI:10.13637/j.issn.1009-6094.2026.0630.
基金信息:
舟山市定海区科技计划项目（2023C31007）
2026-08-27
2026-08-27
2026-08-27