

FOLLOWUS
a.The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
b.Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing 100048, China
wyxuan@th.btbu.edu.cn (Y.X.W.)
p.ma@jiangnan.edu.cn (P.M.M.)
Received:20 April 2020,
Revised:2020-5-20,
Accepted:22 May 2020,
Online First:17 August 2020,
Published:01 January 2021
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Yu, M. M.; Yang, W. J.; Niu, D. Y.; Cai, X. X.; Weng, Y. X.; Dong, W. F.; Chen, M. Q.; Xu, P. W.; Wang, Y.; Chu, H.; Ma, P. M. Enhancing the crystallization performance of poly(L-lactide) by intramolecular hybridizing with tunable self-assembly-type oxalamide segments. Chinese J. Polym. Sci. 2021, 39, 122–132
Man-Man Yu, Wei-Jun Yang, De-Yu Niu, et al. Enhancing the Crystallization Performance of Poly(L-lactide) by Intramolecular Hybridizing with Tunable Self-assembly-type Oxalamide Segments[J]. Chinese Journal of Polymer Science, 2021, 39(1): 122-132.
Yu, M. M.; Yang, W. J.; Niu, D. Y.; Cai, X. X.; Weng, Y. X.; Dong, W. F.; Chen, M. Q.; Xu, P. W.; Wang, Y.; Chu, H.; Ma, P. M. Enhancing the crystallization performance of poly(L-lactide) by intramolecular hybridizing with tunable self-assembly-type oxalamide segments. Chinese J. Polym. Sci. 2021, 39, 122–132 DOI: 10.1007/s10118-020-2461-3.
Man-Man Yu, Wei-Jun Yang, De-Yu Niu, et al. Enhancing the Crystallization Performance of Poly(L-lactide) by Intramolecular Hybridizing with Tunable Self-assembly-type Oxalamide Segments[J]. Chinese Journal of Polymer Science, 2021, 39(1): 122-132. DOI: 10.1007/s10118-020-2461-3.
In this work
hydroxyl-terminated oxalamide compounds
N
1
N
2
-bis(2-hydroxyethyl)oxalamide (OXA1) and
N
1
N
1
′
-(ethane-1
2-diyl)bis(
N
2
-(2-hydroxyethyl)oxalamide (OXA2) were synthesized to initiate the ring-opening polymerization of L-lactide for preparation of oxalamide-hybridized poly(L-lactide) (PLA
OXA
)
i.e.
PLA
OXA1
and PLA
OXA2
. The crystallization properties of PLA were improved by the self-assembly of the oxalamide segments in PLA
OXA
which served as the initial heterogeneous nuclei. The crystal growth kinetics was studied by Hoffman-Lauritzen theory and it revealed that the nucleation energy barrier of PLA
OXA1
and PLA
OXA2
was lower than that of PLA. Consequently
PLA
OXA
could crystallize much faster than PLA
accompanied with a decrease in spherulite size and half-life crystallization time by 74.8% and 86.5% (
T
=125 °C)
respectively. In addition
the final crystallinity of PLA
OXA1
and PLA
OXA2
was 6 and 8 times higher
respectively
in comparison with that of neat PLA under a controlled cooling rate of 10 °C/min. The results demonstrate that the hybridization of oxalamide segments in PLA backbone will serve as the self-heteronucleation for promoting the crystallization rate. The higher the content of oxalamide segments (PLA
OXA2
compared with PLA
OXA1
) is
the stronger the promotion effect will be. Therefore
this study may provide a universal approach by hybridizing macromolecular structure to facilitate the crystallization of semi-crystalline polymer materials.
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