

FOLLOWUS
a.The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, Jiangnan University, Wuxi 214122, China
b.PlemPolco B.V., Roek 24, 5508 KE Veldhoven, the Netherlands
p.ma@jiangnan.edu.cn
Received:18 March 2022,
Revised:2022-4-3,
Accepted:18 April 2022,
Online First:20 July 2022,
Published:01 January 2023
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Li, J. X.; Niu, D. Y.; Liu, B.; Xu, P. W.; Yang, W. J.; Lemstra, P. J.; Ma, P. M. Improvement on the mechanical performance and resistance towards hydrolysis of poly(glycolic acid) via solid-state drawing. Chinese J. Polym. Sci. 2023, 41, 14–23
Jia-Xuan Li, De-Yu Niu, Bo Liu, et al. Improvement on the Mechanical Performance and Resistance Towards Hydrolysis of Poly(glycolic acid)
Li, J. X.; Niu, D. Y.; Liu, B.; Xu, P. W.; Yang, W. J.; Lemstra, P. J.; Ma, P. M. Improvement on the mechanical performance and resistance towards hydrolysis of poly(glycolic acid) via solid-state drawing. Chinese J. Polym. Sci. 2023, 41, 14–23 DOI: 10.1007/s10118-022-2760-y.
Jia-Xuan Li, De-Yu Niu, Bo Liu, et al. Improvement on the Mechanical Performance and Resistance Towards Hydrolysis of Poly(glycolic acid)
In this work
a solid-state drawing process after melt extrusion was carried out on poly(glycolic acid) (PGA) to form oriented crystal structures and tightly arranged rigid amorphous fraction which strongly improved the mechanical properties and the resistance to hydrolysis of PGA.
Poly(glycolic acid) is a biocompatible as well as biocomposable polymer with superior mechanical and barrier properties and
consequently
has found important applications in both medical and packaging fields. However
the high hydrolysis rate in a high humidity environment restricts its application. In this work
a solid-state drawing process after melt extrusion is applied in order to produce fibrous PGA with enhanced mechanical properties and a much better resistance towards hydrolysis. The crystal structure of PGA gradually transformed from spherulites into oriented fibrous crystals in the stretching direction upon solid-state drawing. Meanwhile
both the length of microfibril and the size of lamellae increased initially with the drawing ratio (DR)
while the chain-folded lamellae transformed into extended-chain fibrils at high(er) DR. The oriented structures lead to an overall improvement of the mechanical properties of PGA
e.g.
the tensile strength increased from 62.0±1.4 MPa to 910±54 MPa and the elongation at break increased from around 7% to 50%. Meanwhile
the heat capacity of totally mobile amorphous PGA (Δ
C
p
0
=0.64 J∙g
−1
∙°C
−1
) was reported for the first time
which was used to analyze the content of mobile amorphous fraction (
X
MAF
) and rigid amorphous fraction (
X
RAF
). Both the oriented chain-folded lamellae crystals and the tightly arranged RAF are beneficial to prevent water molecules from penetrating the matrix
thus improving the resistance towards hydrolysis. As a consequence
the fibrous PGA with a DR of 5 showed a tensile strength retention rate of 17.3% higher in comparison with the undrawn sample after 7-days accelerated hydrolysis. Therefore
this work provides a feasible method to improve the mechanical and resistance towards hydrolysis performance of PGA
which may broaden its application and prolong the shelf-life of PGA products.
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