Impact of Annealing on the Melt Recrystallization of a-PDLA/<italic style="font-style: italic">α</italic>-PLLA Double-layered Films

Yun-Peng Li; Hao-Ran Shen; Shao-Juan Wang; Hao Zhang; Jian Hu; Rui Xin; Xiao-Li Sun; Shou-Ke Yan

doi:10.1007/s10118-023-3035-y

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Impact of Annealing on the Melt Recrystallization of a-PDLA/α-PLLA Double-layered Films

RESEARCH ARTICLE | Updated：2024-01-12

- Impact of Annealing on the Melt Recrystallization of a-PDLA/α-PLLA Double-layered Films
- Chinese Journal of Polymer Science Vol. 42, Issue 2, Pages: 230-238(2024)
- Affiliations：
  
  a.Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao 266042, China
  b.State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Author bio：
  
  xinrui0927@foxmail.com (R.X.)
  skyan@qust.edu.cnskyan@mail.buct.edu.cn (S.K.Y.)
- Funds：
- DOI：10.1007/s10118-023-3035-y
  CLC：
- Received：03 July 2023，
  
  Revised：2023-7-21，
  
  Accepted：24 July 2023，
  
  Online First：15 September 2023，
  
  Published：01 February 2024
- Accepted：
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Li, Y. P.; Shen, H. R.; Wang, S. J.; Zhang, H.; Hu, J.; Xin, R.; Sun, X. L.; Yan, S. K. Impact of annealing on the melt recrystallization of a-PDLA/α-PLLA double-layered films. Chinese J. Polym. Sci. 2024, 42, 230–238

Yun-Peng Li, Hao-Ran Shen, Shao-Juan Wang, et al. Impact of Annealing on the Melt Recrystallization of a-PDLA/α-PLLA Double-layered Films[J]. Chinese Journal of Polymer Science, 2024, 42(2): 230-238. DOI: 10.1007/s10118-023-3035-y.
Li, Y. P.; Shen, H. R.; Wang, S. J.; Zhang, H.; Hu, J.; Xin, R.; Sun, X. L.; Yan, S. K. Impact of annealing on the melt recrystallization of a-PDLA/α-PLLA double-layered films. Chinese J. Polym. Sci. 2024, 42, 230–238 DOI： 10.1007/s10118-023-3035-y.

Yun-Peng Li, Hao-Ran Shen, Shao-Juan Wang, et al. Impact of Annealing on the Melt Recrystallization of a-PDLA/α-PLLA Double-layered Films[J]. Chinese Journal of Polymer Science, 2024, 42(2): 230-238. DOI: 10.1007/s10118-023-3035-y. DOI：

摘要

The different structures of double-layers

containing amorphous PDLA and highly oriented PLLA ultrathin films

with and without prior annealing at 150 C after melting at 190 C and then recrystallizing isothermally at 90 C have clearly illustrated the great impact of pre-annealing on the subsequent melt recrystallization behavior of them.

Abstract

Poly(lactic acid) (PLA) as a bio-based polymer with biodegradability and biocompatibility has attracted much attention. To manipulate its properties for different applications

regulation of crystal structure and crystalline morphology becomes an attractive research topic. In this work

the structure evolution of layered samples containing an amorphous poly(D-lactide) (PDLA) layer and a crystalline poly(L-lactide) (PLLA) layer with highly oriented edge-on

lamellar crystals after annealing at 150 °C or/and after melt-recrystallization has been studied by AFM

FTIR

and TEM combined with electron diffraction. The results demonstrate that melt recrystallization of the as-prepared sample leads to the formation of abundant randomly oriented PLA stereo-complex (PLA SC) crystals. Annealing at 150 °C results in the formation of a small amount of oriented PLA SC crystals at the interface. These PLA SC crystals show great impact on the recrystallization behavior of sample after melting at 190 °C and then crystallizing at 90 °C. First

they impede the mutual diffusion of the overlying PDLA and underlying PLLA

and thus reduce their stereo-complexation ability as manifested by the decreased amount of PLA SC crystals. Second

they act as substrate to initiate the epitaxial crystallization of the overlying PDLA and underlying PLLA

which ensures the production of a highly oriented structure of PDLA and PLLA after melt recrystallization again.

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Impact of Annealing on the Melt Recrystallization of a-PDLA/α-PLLA Double-layered Films

DOI：10.1007/s10118-023-3035-y

摘要

Abstract

关键词

Keywords

references