Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (06): 1-7.doi: 10.13475/j.fzxb.20190705607

• Fiber Materials •     Next Articles

Extraction of oligomers from bio-based propylene terephthalate polyester and its thermal properties

WANG Jingjing1, CHEN Yong1, WANG Chaosheng1, WANG Huaping1,2, BIAN Shuchang3, WU Jing2()   

  1. 1. School of Materials Science and Engineering, Donghua University, Shanghai 201620, China
    2. Key Technology Collaborative Innovation Center of Textile Industry, Donghua University, Shanghai 201620, China
    3. Jiangsu Guowang High-Tech Fiber Co., Ltd., Suzhou, Jiangsu 215000, China
  • Received:2019-07-19 Revised:2020-03-11 Online:2020-06-15 Published:2020-06-28
  • Contact: WU Jing E-mail:wuj@dhu.edu.cn

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Abstract:

Aiming at the problem that the formation of a large number of cyclic oligomers in the industrialization process of current bio-based propylene terephthalate (bio-based PTT) is likely to adversely affect subsequent processing, the Soxhlet extraction method and the dissolution-precipitation method were used to characterize and analyze cyclic oligomers extracted from PTT slices, fibers and powder samples. It is reported from this research that the content of cyclic oligomers extracted from the fiber sample was 3.6%, which is about 1% higher than the slice. The main component of the oligomer is cyclic dimer, and its mass fraction is 85%-90% of the total of oligomers. Low levels of cyclic trimer, cyclic tetramer, cyclic pentamer, and cyclic heptamer are detected at the same time, and the total content of these components is about 10%-15%. The thermal stability of cyclic oligomers is found much lower than that of bio-based PTT polymers and higher than polymers in melting point, showing function of nucleating agent and could promote the crystallization of polymers.

Key words: polymer, bio-based propylene terephthalate, cyclic oligomer, solvent extraction, thermal property

CLC Number: 

  • TQ342.29

Tab.1

Bio-based PTT polyester physical properties"

样品
编号		 数均
分子量		 重均
分子量		 分子量
分散度		 特性黏度/
(dL·g-1)
PTT-1 17 400 42 300 2.4 1.01
PTT-2 19 500 47 700 2.4 0.99
PTT-3 19 500 43 600 2.2 0.97

Tab.2

Extraction content of bio-based PTT polyester chips and fiber samples by dissolution-precipitation method%"

样品编号 切片低聚物提取量 纤维低聚物提取量
PTT-1 2.60 3.23
PTT-2 2.39 2.79
PTT-3 3.01 3.55

Fig.1

Relationship between mass ratio of oligomer extracted from PTT chip, powder and fiber with different solvent. (a) Chloroform extraction;(b) Dioxane extraction; (c) Chloroform/dioxane extraction"

Fig.2

Surface SEM images of bio-based PTT-2 polyester fiber before(a)and after (b) Soxhlet extraction"

Fig.3

Liquid chromatographic separation of oligomers extracted from bio-based PTT-2 chips via Soxhlet extraction and dissolution-precipitation methods"

Fig.4

Proportions of 6 extracted components of oligomers extracted from bio-based PTT polyester chips"

Fig.5

1HNMR spectra of oligomers extracted from bio-based PTT polyester chips"

Fig.6

Infrared spectra of extracts from bio-based PTT-2 polyester chips by Soxhlet extraction"

Fig.7

MALDI-TOF plot of Soxhlet extract from bio-based PTT-2 polyester chips"

Fig.8

Thermogravimetric analysis curve"

Fig.9

DSC curves of oligomers extracted from bio-based PTT-2 polyester by Soxhlet extraction. (a) Heating curve; (b) Cooling curve"

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