Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (12): 21-25.doi: 10.13475/j.fzxb.20200303905

• Fiber Materials • Previous Articles     Next Articles

Study on water-initiated ring-opening polymerization technology of L-lactide

WEN Xin, ZHANG Xuzhen(), LI Yong, HUANG Wenjian, LU Chen   

  1. School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2020-03-16 Revised:2020-09-09 Online:2020-12-15 Published:2020-12-23
  • Contact: ZHANG Xuzhen E-mail:donghuaihe@163.com

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Abstract:

The presence of hydroxyl-rich water in the bulk ring-opening polymerization of L-lactide (LLA) leads to lower molecular weight of obtained poly(L-lactide) (PLLA). In order to solve this problem, several moisture controlling technologies including purification of LLA monomer, drying of refined LLA and vacuum drying in the reactor before polymerization were investigated for their effects on the molecular weight of PLLA using stannous (Ⅱ) ethylhexanoate (Sn(Oct)2) as the catalyst. Nuclear magnetic resonance spectrometer, Fourier transform infrared spectrometer, differential scanning calorimeter and thermogravimetric analysis were used to analyze the chemical structure and thermodynamic properties of PLLA. The results show that increasing purification times of LLA, extending drying time of refined LLA and extending the vacuum drying time in the reactor before polymerization all contribute to the increase of viscosity average molecular weight of PLLA. Compared with low viscosity average molecular weight PLLA, the high viscosity average molecular weight PLLA has a higher melting point of 175 ℃ and better thermal stability.

Key words: L-lactide, ring-opening polymerization, viscosity average molecular weight, initiator, thermal stability, poly(L-lactide) polymerization process

CLC Number: 

  • O631.5

Fig.1

Effect of purification times of L-lactide on viscosity average molecular weight of PLLA"

Fig.2

Effect of drying time of refined L-lactid on viscosity average molecular weight of PLLA"

Fig.3

Effect of drying time before polymerization on viscosity average molecular weight of PLLA"

Fig.4

1H-NMR spectra of PLLA"

Fig.5

FT-IR spectra of PLLA"

Fig.6

DSC heating curves of PLLA"

Fig.7

Thermal stability loss curves of PLLA. (a)TG curves;(b)DTG curves"

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