Effect of poly(ethylene oxide) with different molecular weights on the electrospinnability of sodium alginate
Effect of poly(ethylene oxide) with different molecular weights on the electrospinnability of sodium alginate
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DOI：
10.1016/j.polymer.2009.07.043
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发表时间：
2009-09-23
期刊：
影响因子：
4.6
通讯作者：
Han, Charles C.
中科院分区：
文献类型：
--
作者：
Nie, Huarong;He, Aihua;Han, Charles C.
虽然海藻酸钠（SA）不能从其水溶液中进行静电纺丝，但在聚乙烯氧化物（PEO）的帮助下可以制备海藻酸钠基静电纺丝纳米纤维。本研究考察了PEO对SA水溶液电可纺性的影响，并强调了链缠结和共混体系构象的作用。结果表明，少量高分子量的PEO100可以提高SA水溶液的电可纺性。然而，大量低分子量的PEO2对SA水溶液的电可纺性没有积极影响。动态激光散射（dls）结果表明，水溶液中PEO分子链处于纠缠态时，PEO才能增强SA水溶液的电可纺性。进一步的神学测量研究表明，即使在SA溶液浓度接近浓态时，SA分子链也不会形成明显的电纺丝缠结。SA分子链由于其刚性和延伸性构象紧密“重叠”，不能形成有效的链缠结。PEO100对提高SA电可纺性的主要贡献是提供了缠结位点，从而提高了共混体系的适用缠结程度。然而，尽管PEO2和SA之间的链相互作用可能会略微提高SA链的柔韧性，但混合溶液的链缠结并不明显。提出了三种分子模型，直观地描述了不同分子量的PEO对SA链构象和缠结的影响。2009爱思唯尔有限公司版权所有。
Although sodium alginate (SA) could not be electrospun from its aqueous solution, SA-based electrospun nanofibers can be fabricated with the help of polyethylene oxide (PEO). In this study, the influence of PEO on the electrospinnability of SA aqueous solution was investigated and the roles of chain entanglements and conformations of the blend system were emphasized. It was found that a little amount of PEO100 with high molecular weight could improve the electrospinnability of SA aqueous solution. However, a large amount of PEO2 with low molecular weight had no positive effect on the electrospinnability of SA aqueous solution. Dynamic laser light scattering (DLLS) results showed that only when the PEO molecular chains in aqueous solution were in an entangled state, PEO can enhance the electrospinnability of SA aqueous solution. The further study on theological measurements showed that SA molecular chains could not form significant entanglements for the electrospinning even when the SA solution concentration approached concentrated regime. SA molecular chains are closely "overlapped" due to its rigid and extended conformation and cannot form effective chain entanglement. The main contribution of PEO100 to improve SA electrospinnability is offering entanglement sites and thereby enhancing the applicable entanglement degree of the blend system. Whereas, although the chain interaction between PEO2 and SA may improve slightly the flexibility of SA chains, the significant chain entanglements of the blend solution is not achieved. Three molecular models are proposed to depict visually the effect of PEO with different molecular weights on chain conformations and entanglements of SA. (C) 2009 Elsevier Ltd. All rights reserved.