Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (10): 1-6.doi: 10.13475/j.fzxb.20200100606

• Fiber Materials •     Next Articles

Effect of oligomers on crystalline properties of polytrimethylene terephthalate

CHEN Yong1,2, WANG Jingjing2, WANG Chaosheng2, GU Donghua3, WU Jing1(), WANG Huaping1,2   

  1. 1. Co-Innovation Center for Textile Industry, Donghua University, Shanghai 201620, China
    2. College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
    3. Jiangsu Guowang Hi-Tech Fiber Co., Ltd., Suzhou, Jiangsu 215226, China
  • Received:2020-01-06 Revised:2020-07-11 Online:2020-10-15 Published:2020-10-27
  • Contact: WU Jing E-mail:wuj@dhu.edu.cn

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Abstract:

Step-polymerization of polymers usually contains a certain proportion of linear and circular oligomers, which will affect the forming process of fiber materials, fiber properties, textile processing and so on. To investigate the influence of oligomers on the crystallization properties of bio-based polytrimethylene terephthalate (PTT), bio-based PTT samples with varied oligomer contents (mainly comprising cyclic dimers) were prepared by adding the extracted oligomers into relatively pure PTT samples. Differential scanning calorimetry analysis was used to study the crystallization kinetics of bio-based PTT polyesters. The results show that the existence of oligomer mainly acts as nucleating agent, and the increase of its mass fraction can significantly increase the crystallization rate, the crystallization temperature and crystallinity of bio-based PTT. When the mass fraction of oligomer is 10%, the crystallization rate constant of PTT increased from 0.528 to 0.603, while the crystallization temperature increased from 172.11 ℃ to 178.85 ℃.

Key words: oligomer, cyclic oligomer, bio-based polyester, polytrimethylene terephthalate, crystallization kinetic

CLC Number: 

  • TQ342

Fig.1

DSC curves of non-isothermal crystallization of bio-based PTT with different oligomer mass fraction"

Fig.2

Relationship between cooling rate and crystallization peak temperature of bio-based PTT with different oligomer mass fraction"

Fig.3

Relation curves of relative crystallinity with time of different oligomer mass fraction bio-based PTT"

Tab.1

Crystallization parameters of bio-based PTT with different oligomer mass fraction at different cooling rates"

降温速率/
(℃·min-1)		 0% 4% 8% 10%
TP △W t1/2 TP △W t1/2 TP △W t1/2 TP △W t1/2
5 172.11 9.80 1.26 173.35 9.72 1.24 173.83 8.15 0.91 178.85 5.58 0.90
10 162.69 13.53 1.60 163.73 13.38 1.55 164.81 7.35 1.21 168.8 6.47 1.20
15 157.02 16.91 2.31 158.55 16.89 2.28 159.46 8.43 1.90 164.49 6.08 1.77
20 151.99 20.46 3.90 153.31 20.16 3.53 157.07 9.55 3.52 161.86 6.41 2.95

Fig.4

Crystalline Avrami curves at different cooling rates of bio-based PTT with different oligomer mass fraction"

Tab.2

Experimental values of crystallization kinetic parameters during non-isothermal processes"

降温速率/
(℃·min-1)		 0% 4% 8% 10%
n Zt Zc n Zt Zc n Zt Zc n Zt Zc
5 1.050 0.041 0.528 1.046 0.063 0.589 1.035 0.071 0.575 1.033 0.079 0.603
10 1.024 0.112 0.803 1.016 0.134 0.817 1.025 0.164 0.834 1.022 0.177 0.841
15 1.037 0.191 0.895 1.018 0.198 0.898 1.025 0.271 0.916 1.024 0.279 0.918
20 1.034 0.264 0.935 1.024 0.272 0.937 1.021 0.380 0.952 1.029 0.300 0.953
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