In-situ investigation of multiple endothermic peaks in isomorphous poly(3-hydroxybutyrate-co-3-hydroxyvalerate) with low HV content by synchrotron radiation
| Autor: | Zongbao Wang, You Lv, Weijun Miao, Mengjie Zhu, Hao Zhu, Yiguo Li, Tianchen Duan |
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| Rok vydání: | 2019 |
| Předmět: |
In situ
Fusion Materials science Polymers and Plastics Small-angle X-ray scattering Organic Chemistry Enthalpy Analytical chemistry Synchrotron radiation 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Endothermic process 0104 chemical sciences Poly(3-hydroxybutyrate)-co-(3-hydroxyvalerate) Materials Chemistry 0210 nano-technology |
| Zdroj: | Polymer. 169:1-10 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2019.01.077 |
| Popis: | Multiple endothermic peaks of isomorphous P(HB-co-HV) with low HV content were investigated by DSC, in-situ WAXD and SAXS measurements. The multiple endothermic peaks are confirmed to be caused by two different kinds of crystal structures of P(HB-co-HV), namely uniform lamellae with HV units complete exclusion and sandwich lamellae with HV units partial inclusion. With the increase of the temperature, the thinner uniform lamellae melt at the lower melting peak and the thicker sandwich lamellae melt at the higher melting peak. Comparing with P(HB-co-4.9%HV), P(HB-co-9.4%HV) has the larger value of unit cell parameters and the higher distribution and fusion enthalpy of higher melting peak, which confirm that P(HB-co-HV) with higher HV content contains more sandwich lamellae and more HV units included in crystals for P(HB-co-HV) with HV content lower than 10 mol%. |
| Databáze: | OpenAIRE |
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