采用 TEMPO(2,2,6,6-四甲基哌啶氧化物自由基)氧化纤维素纳米纤维(TOCNs)作为聚乙烯醇(PVA)/水性聚氨酯(WPU)静电纺膜的增强剂。研究中使用拉伸实验研究 TOCNs 的增强作用,此外还使用扫描电子显微镜、红外光谱仪、热重分析仪及差示扫描量热仪等对静电纺膜进行结构性能表征。扫描电镜观察发现当纳米纤维素加入量为5％(质量分数)时,其在聚合物基质中分散良好,所得静电纺纳米纤维保持了良好的形态。此外,加入5％(质量分数)的纳米纤维素能够将材料的抗张强度提高44％,且纳米纤维素的加入对材料的热稳定性也有一定的改善,纳米纤维素起到一种纳米填料的效果。鉴于 PVA、WPU、TOCNs均为亲水性,无毒且具有生物相容性的物质,所得静电纺膜在组织支架及伤口护理材料等方面具有潜在应用。
TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-oxidized cellulose nanofibers (TOCNs)were used as nanofillers for polyvinyl alcohol/waterborne polyurethane electrospun nano-fiber mats in this work.The reinforcing capability of TOCNs was investigated by tensile tests.SEM,IR,TGA and DSC were also carried out in order to characterize the influence of the cellulose nanofibers on electrospun mats.Scanning electron mi-croscopy results showed that TOCNs were well dispersed in PVA/WPU matrix.The reinforced composites had a ca.44% increase in their mechanical properties with addition of only 5wt% of TOCNs.Moreover,The addi-tion of TOCNs improved the thermal stability of PVA/WPU electrospun mats.TOCNs were working as Nano-fillers in the composite.Since PVA,WPU and TOCNs are hydrophilic,non-toxic and biocompatible,and there-fore,these electrospun nano-fiber mats could be used for tissue scaffolding and wound dressing materials,etc.
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