Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (07): 9-16.doi: 10.13475/j.fzxb.20210507308

• Fiber Materials • Previous Articles     Next Articles

Thickening behaviour and performance of titanium-based polyethylene terephthalate

LIN Qisong, GAO Feng, LÜ Wangyang, CHEN Wenxing()   

  1. National Engineering Laboratory for Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2021-05-24 Revised:2021-11-17 Online:2022-07-15 Published:2022-07-29
  • Contact: CHEN Wenxing E-mail:wxchen@zstu.edu.cn

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Abstract:

To extend the application of titanium-based polyethylene terephthalate (PET) in the manufacturing industrial polyester yarns, advanced polymer chromatography together with multi-angle laser light scattering was employed to research the thickening behaviour under various temperatures. A relationship between polycondensation temperature and molecular weight and its distribution of titanium-based PET were established. UV-Vis spectrophotometer and differential scanning calorimeter were used to study PET coloration with its thermal properties. The results indicate that molecular weight of the titanium-based PET increases as the polycondensation temperatures increase, and its coloration is obviously affected by the temperature. The required time for viscosity increasing decreases as the temperatures rise. The weight-average molecular weight for titanium-based PET obtained at 270 ℃ for 20 min reaction time is similar to that obtained at 220 ℃ for 10 h reaction time. It is shown that the elevated molecular weight leads to a decrease of PET crystalline performance and melt temperature. The molecular weight distribution becomes narrower when polycondensation temperature exceeds the melting temperature, and the molecular weight meets the requirements for industrial polyester yarns. The study on high molecular weight with narrow molecular weight distribution provides useful reference for making industrial polyester yarns.

Key words: industrial polyester yarn, titanium catalyst, melt polycondensation, thickening behaviour

CLC Number: 

  • TS15

Fig.1

UV-Vis spectra of titanium-based PET at different polycondensation temperatures. (a) Solid-state(reaction time 10 h);(b)Liquid-state(reaction time 60 min)"

Fig.2

Influence of reaction time on absorption value of titanium-based PET at 410 nm with polycondensation temperatures. (a) Solid-state(220 ℃); (b) Liquid-state(270 ℃)"

Tab.1

Molecular parameters and intrinsic viscosity for titanium-based PET with variety polycondensation conditions"

反应温度/℃ 特性黏度/(dL·g-1) 黏均分子量/(g·mol-1) 数均分子量/(g·mol-1) 重均分子量/(g·mol-1) 多分散指数
原样 0.676 18 960 22 780 36 970 1.623
210 0.791 22 960 26 780 44 500 1.661
220 0.880 26 150 31 510 51 680 1.640
230 0.959 29 040 42 460 66 280 1.599
240 0.986 30 020 38 090 69 890 1.835
250 1.002 30 610 45 110 78 650 1.743
260 1.104 34 470 35 530 66 030 1.859
270 1.054 32 560 39 590 68 090 1.720
280 1.080 33 560 44 890 68 830 1.533

Fig.3

Effect of reaction time on weight-average molecular weight evolution during polycondensation of titanium-based PET. (a) Solid-state(220 ℃); (b) Liquid-state(270 ℃)"

Fig.4

Molecular weight distribution curves of titanium-based PET after polycondensation at 270 ℃ with increasing react time. (a) Differential curves; (b) Integral curves"

Tab.2

Molecular parameters and intrinsic viscosity for titanium-based PET with reaction temperature of 270 ℃"

反应时间/min 特性黏度/(dL·g-1) 黏均分子量/(g·mol-1) 数均分子量/(g·mol-1) 重均分子量/(g·mol-1) 多分散指数
0 0.676 18 960 22 780 36 970 1.623
20 0.902 26 930 31 760 53 770 1.693
60 1.054 32 560 39 590 68 090 1.720
100 1.176 37 240 42 300 72 140 1.705
140 1.257 40 390 45 820 81 990 1.789

Fig.5

DSC secondary heating (a) and cooling (b) curves of titanium-based PET with different temperatures at a reaction time of 10 h with solid-state and 60 min with liquid-state"

Fig.6

DSC secondary heating (a) and cooling (b) curves of titanium-based PET after liquid-state polycondensation with different reaction time at a temperature of 270 ℃"

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