Fully-biodegradable poly(3-hydroxybutyrate)/poly(vinyl alcohol) blend films with compositional gradient
Fully-biodegradable poly(3-hydroxybutyrate)/poly(vinyl alcohol) blend films with compositional gradient
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DOI：
10.1002/mabi.200400009
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发表时间：
2004-08-09
影响因子：
4.6
通讯作者：
Inoue, Y
中科院分区：
文献类型：
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作者：
Li, Z;Tsuchiya, K;Inoue, Y
采用溶解-扩散法制备了一种可完全生物降解的细菌聚3-羟基丁酸酯（PHB）/化学合成聚乙烯醇（PVA）共混膜，该共混膜从一面到另一面具有组分梯度。三种PVA样品，高和低分子量的无规立构PVA和高间规立构PVA（s-PVA），被用来调查的分子量和有规结构的组成梯度的产生的影响。将PHB在1，1，1，3，3，3-六氟-2-丙醇（HFIP）（其也是PVA的良好溶剂）中的溶液流延在PVA膜上，然后蒸发溶剂HFIP。通过选择最佳的溶剂用量和蒸发速率，得到了具有组分梯度的聚羟基丁酸/聚乙烯醇共混膜。通过FT-IR显微镜和ATR-FT-IR分析证实了组成梯度的形成。通过将PHB/HFIP溶液流延到s-PVA膜上，得到了具有接近理想组成梯度的50%/50%PHB/s-PVA共混膜，即膜中的PHB（或PVA）组成从膜的一面的100%逐渐变化到另一面的0%。
Fully-biodegradable bacterial poly(3-hydroxybutyrate) (PHB)/chemosynthetic poly(vinyl alcohol) (PVA) blend films with compositional gradient from one surface to the other surface of the films were prepared by a dissolution-diffusion technique. Three kinds of PVA samples, high- and low-molecular weight atactic PVA and highly syndiotactic PVA (s-PVA), were used in order to investigate the effects of molecular weight and tactic structure on the generation of compositional gradient. The solution of PHB in 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP), which is also a good solvent for PVA, was cast on the PVA film and then the solvent HFIP was evaporated. By selecting the optimum volume of solvent and the evaporation rate, the PHB/PVA blend film with compositional gradient was obtained. The formation of compositional gradient was confirmed by FT-IR microscopy and ATR-FT-IR analysis. The 50%/50% PHB/s-PVA blend film with a nearly ideal compositional gradient, that is, the composition of PHB (or PVA) in the film changing gradually from 100% at one surface to 0% at the other surface of the film was obtained by casting PHB/HFIP solution on to the s-PVA film.