کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5185320 | 1381074 | 2010 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Comonomer-unit compositional distribution and its effect on thermal and crystallization behavior of bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) Comonomer-unit compositional distribution and its effect on thermal and crystallization behavior of bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)](/preview/png/5185320.png)
In order to clarify the relationships between comonomer-unit compositional distribution and physical properties of bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HHx)], the comonomer-unit composition and its distribution as well as their effects on the physical properties of P(3HB-co-3HHx) have been studied. A series of fractions with very different comonomer-unit composition but very narrow distribution were obtained by repeated fractionation and re-fractionation. It was found the as-bacterially synthesized P(3HB-co-3HHx) had very broad comonomer-unit compositional distribution. The solvent/non-solvent fractionation of P(3HB-co-3HHx) was found to be firstly regulated by the comonomer-unit composition and then by the molecular weight. Significant effect of the comonomer-unit compositional distribution on thermal and crystallization behavior as well as crystalline morphology of P(3HB-co-3HHx) was observed. It was concluded that as-bacterially synthesized P(3HB-co-3HHx) samples should be considered as polymer blends of component polymers with different 3HHx unit content, whose physical properties considerably depend on the comonomer-unit composition as well as comonomer-unit compositional distribution.
Journal: Polymer - Volume 51, Issue 19, 3 September 2010, Pages 4408-4418