Synthesis, physical properties and enzymatic degradation of poly (oxyethylene-b-butylene succinate) ionomers
Synthesis, physical properties and enzymatic degradation of poly (oxyethylene-b-butylene succinate) ionomers
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DOI：
10.1016/j.polymer.2011.04.065
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发表时间：
2011-06
期刊：
影响因子：
4.6
通讯作者：
S. Hwang;X. Jin;E. Yoo;S. Im
中科院分区：
文献类型：
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作者：
S. Hwang;X. Jin;E. Yoo;S. Im
以聚乙二醇磺酸钠（SPEG）和1，4-丁二醇为混合单体，丁二酸为原料，采用两步缩聚法合成了一系列聚丁二酸丁二醇酯（POBS）离聚物。用~1H NMR谱确定了这些嵌段离聚物的组成和化学结构。为了评估POBS共聚物在一次性应用中的潜在用途，我们研究了其结晶度、动态力学性能和对酶水解的敏感性。随着SPEG含量的增加，POBS共聚物的结晶度显著降低，这是因为离子相互作用导致了链折叠的延迟。即使如此，具有0.5摩尔%SPEG的POBS在测试样品中显示出最高的储能模量。这一结果归因于分子间的相互作用。POBS共聚物的酶促水解比均聚（丁二酸丁二醇酯）发生得更快，并且随着离子含量的增加而急剧加速。这归因于离子基团的存在，其不仅降低了POBS表面的结晶度，而且改善了POBS表面的亲水性。
A series of poly(oxyethylene-b-butylene succinate) (POBS) ionomers were synthesized by a two-step polycondensation of succinic acid and mixed monomers of sodium sulfonated polyethylene glycol (SPEG) and 1,4-butanediol. The composition and chemical structure of these segmented ionomers were determined by1H NMR spectroscopy. To evaluate the potential uses of POBS copolymer in disposable applications, we investigated the crystallinity, dynamic mechanical properties and susceptibility to enzymatic hydrolysis. The crystallinity of POBS copolymer decreased considerably with increasing SPEG content because ionic interaction led to retardation of chain folding. Even so, POBS with 0.5 mol% SPEG showed the highest storage modulus among tested samples. This result is attributed to intermolecular interactions. Enzymatic hydrolysis of POBS copolymer occurs more rapidly than homo poly(butylene succinate) and was drastically accelerated with increasing ionic contents. This is attributed to the presence of the ionic group, which not only reduced the crystallinity but also improved hydrophilicity on the POBS surface.