A Synchrotron <italic style="font-style: italic">in situ</italic> X-ray Study on the Multiple Melting Behaviors of Isomorphous Poly(3-hydroxybutyrate-<italic style="font-style: italic">co</italic>-3-hydroxyvalerate)(P(HB-<italic style="font-style: italic">co</italic>-HV)) with Middle HV Content

Hao Zhu; You Lv; Dan Shi; Yi-Guo Li; Wei-Jun Miao; Zong-Bao Wang

doi:10.1007/s10118-020-2427-5

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A Synchrotron in situ X-ray Study on the Multiple Melting Behaviors of Isomorphous Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(P(HB-co-HV)) with Middle HV Content

ARTICLE | Updated：2020-05-27

- A Synchrotron in situ X-ray Study on the Multiple Melting Behaviors of Isomorphous Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(P(HB-co-HV)) with Middle HV Content
- Chinese Journal of Polymer Science Vol. 38, Issue 9, Pages: 1015-1024(2020)
- Affiliations：
  
  Ningbo Key Laboratory of Specialty Polymers, State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
- Author bio：
  
  wangzongbao@nbu.edu.cn
- Funds：
- DOI：10.1007/s10118-020-2427-5
  CLC： M
- Received：24 January 2020，
  
  Revised：2020-3-6，
  
  Accepted：17 March 2020，
  
  Online First：27 May 2020，
  
  Published：2020-09
- Accepted：
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Zhu, H.; Lv, Y.; Shi, D.; Li, Y. G.; Miao, W. J.; Wang, Z. B. A synchrotron , in situ, X-ray study on the multiple melting behaviors of isomorphous poly(3-hydroxybutyrate-, co,-3-hydroxyvalerate) (P(HB-, co,-HV)) with middle HV content. Chinese J. Polym. Sci. 2020, 38, 1015–1024

Hao Zhu, You Lv, Dan Shi, et al. A Synchrotron in situ X-ray Study on the Multiple Melting Behaviors of Isomorphous Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(P(HB-co-HV)) with Middle HV Content[J]. Chinese Journal of Polymer Science, 2020, 38(9): 1015-1024. DOI: 10.1007/s10118-020-2427-5.
Zhu, H.; Lv, Y.; Shi, D.; Li, Y. G.; Miao, W. J.; Wang, Z. B. A synchrotron , in situ, X-ray study on the multiple melting behaviors of isomorphous poly(3-hydroxybutyrate-, co,-3-hydroxyvalerate) (P(HB-, co,-HV)) with middle HV content. Chinese J. Polym. Sci. 2020, 38, 1015–1024 DOI： 10.1007/s10118-020-2427-5.

Hao Zhu, You Lv, Dan Shi, et al. A Synchrotron in situ X-ray Study on the Multiple Melting Behaviors of Isomorphous Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(P(HB-co-HV)) with Middle HV Content[J]. Chinese Journal of Polymer Science, 2020, 38(9): 1015-1024. DOI: 10.1007/s10118-020-2427-5. DOI：

摘要

Abstract

The multiple endothermic peaks without observable recrystallization phenomenon of isomorphous poly(3-hydroxybutyrate-

-3-hydroxyvalerate) [P(HB-

-HV)] with the middle HV content of 19.4 mol% and 28.7 mol% were confirmed by differential scanning calorimetry (DSC)

and the evolutions of crystal structure and lamellar morphology in the heating and melting process were tracked by

in situ

synchrotron wide angle X-ray diffraction (WAXD) and small angle X-ray scattering (SAXS) techniques. The emergence of asymmetric features of both the diffraction peaks and scattering curves indicates the coexistence of different lamellar crystals with varied unit cell parameters. Based on the

in situ

WAXD and SAXS measurements

we calculated the evolutions of the unit cell parameters

and

as well as the long period and lamellar thickness upon heating. The comparative analysis of WAXD and SAXS data confirms that the multiple endothermic peaks of P(HB-

-19.4%HV) and P(HB-

-28.7%HV) result from the melting of different lamellae rather than the melting/recrystallization. The thinner

unstable uniform lamellae with HV counits total inclusion melt first and the thicker

stable sandwich lamellae with HV counits partial inclusion melt last. In addition

the large second melting peak in P(HB-

-19.4%HV)

differing from that of samples with HV content of 28.7 mol% and 36.2 mol%

is due to the unique state of HV content leading to a transition of sandwich lamellae to uniform lamellae. The present study establishes the relationship between the different lamellae structure and multiple melting behaviors of isomorphous copolymer.

关键词

Keywords

references

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A Synchrotron in situ X-ray Study on the Multiple Melting Behaviors of Isomorphous Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(P(HB-co-HV)) with Middle HV Content

DOI：10.1007/s10118-020-2427-5

摘要

Abstract

关键词

Keywords

references