Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (01): 16-21.doi: 10.13475/j.fzxb.20200504006

• Fiber Materials • Previous Articles     Next Articles

Synthesis and properties of biodegradable polyglycolic acid oligomer modified polyester

JIN Linlin1, TIAN Junkai2, LI Jiawei1, QI Dongming1(), SHEN Xiaowei2, WU Chuntao3   

  1. 1. Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Zhejiang Satellite Petrochemical Co., Ltd., Jiaxing, Zhejiang 314000, China
    3. Ningbo Municipal Bureau of Ecology and Environment, Ningbo, Zhejiang 315000, China
  • Received:2020-05-19 Revised:2020-09-08 Online:2021-01-15 Published:2021-01-21
  • Contact: QI Dongming E-mail:dongmingqi@zstu.edu.cn

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Abstract:

In order to improve the degradation performance of aromatic poly (ethylene terephthalate) (PET), a novel polyethylene terephthalate-co-polyglycolic acid copolymer (PET-co-PGA) was synthesized by copolymerization modification of polyester with degradable polyglycolic acid (PGA) oligomer, through combining melt polycondensation and solid-phase polycondensation process. The structure, intrinsic viscosity, crytallization behavior and degradation property of the novel copolyester were characterized and analyzed by using nuclear magnetic resonance spectrometer, differential scanning calorimeter, tensile tester, scanning electron microscope and fluorescence microscope. The results show that the introduction of PGA damages the regularity of PET and results in the decrease of the melting point, crystallization temperature and crystallization ability. The tensile experiments show that the synthesized copolyester with the low volume of addition of PGA has better tenacity compared with pure PET. When 5% PGA is added,the elongation at the break of the copolyester is increased from 13.1% to 15.0%. The degradation rate of pre-modified PET gradually increases with the amount of PGA added.

Key words: modified polyester, polyglycolic acid, poly (ethylene terephthalate), modification by copolymerization, melt polycondensation, solid state polycondensation

CLC Number: 

  • TS193.5

Fig.1

Possible reaction scheme of PET-co-PGA copolymer"

Tab.1

Feed radio of PET-co-PGA copolymer"

样品
编号		 PTA的量/
mol		 EG的量/
mol		 PGA质量
分数/%
1# 0.9 1.2 0
2# 0.9 1.2 1
3# 0.9 1.2 5
4# 0.9 1.2 10
5# 0.9 1.2 15

Fig.2

Chemical structural formula (a)and 1H-NMR spectra(b)of PET-co-PGA copolyesters"

Fig.3

DSC thermorgrams of PET and PET-co-PGA copolyesters. (a) Glass transition temperation;(b) Crystallization temperation;(c) Melting point"

Tab.2

DSC data of PET and PET-co-PGA copolyester"

样品
编号		 Tg/
℃		 Tc/
℃		 Tc-Tg/
℃		 Tm/
℃		 ΔHc/
(J·g-1)		 ΔHm/
(J·g-1)
1# 81.94 180 98.06 248 47.32 67.57
2# 78.68 172 93.32 239 80.05 69.63
3# 75.23 140 64.77 218 17.50 57.10
4# 71.84 191 33.51
5# 67.21 173 8.41

Tab.3

Thermodynamic parameters of PET-co-PGA"

样品
编号		 拉伸断裂强度/
MPa		 弹性模量/
MPa		 断裂伸长率/
%
1# 67.67±0.4 589.03±2.5 13.09±0.20
2# 68.97±0.5 590.19±1.5 13.11±0.15
3# 69.68±0.4 600.32±2.0 15.28±0.22
4# 58.03±0.5 535.48±1.8 10.94±0.24
5# 55.47±0.4 523.33±1.7 9.64±0.28

Fig.4

Alkaline condition degradation of copolyesters"

Fig.5

SEM images of degradation process of copolyester fiber after 0 (a) and 6 weeks (b) of degradation(×5 000)"

Fig.6

Fluorescent photo of copolyester fiber after 0 (a) and 6 weeks (b) of degradation"

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