Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (08): 34-39.doi: 10.13475/j.fzxb.20210602006

• Fiber Materials • Previous Articles     Next Articles

Microstructure and properties of polyester composite fibers with different drafting ratios

GAO Feng1, SUN Yanlin2, XIAO Shunli2, CHEN Wenxing1, LÜ Wangyang1()   

  1. 1. National Engineering Laboratory for Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Tongkun Group Co., Ltd., Jiaxing, Zhejiang 314500, China
  • Received:2021-06-07 Revised:2022-02-27 Online:2022-08-15 Published:2022-08-24
  • Contact: LÜ Wangyang E-mail:luwy@zstu.edu.cn

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Abstract:

In order to study the relationship between process, structure and properties of PET/PTT parallel composite fibers, the crystalline orientation properties, thermal properties, mechanical properties and crimp properties, unstretched and 2.35–3.35 times stretched elastic fibers were tested and analyzed with the two-dimensional wide angle X-ray diffractometer and differential scanning calorimeter.The crystallinity of the PET/PTT composite fiber increased from 43.04％ to 45.73％, but the crystallinity of the PTT fiber remained stable, its orientation increased from 82.3％ to 89.2％, indicating that the draft induction orientation reached saturation. The increase in orientation also led to the increase of the elastic modulus of PET/PTT fiber from 16.8 cN/dtex to 23.1 cN/dtex and the tensile strength from 2.9 cN/dtex to 3.5 cN/dtex, but the elongation at break decreased from 52.6％ to 38.6％; the increase of the draft multiplicity led to the obvious difference of the bicomponent fiber structure. The increase in draft multiplicity led to a significant difference in the structure of the bicomponent fibers, resulting in more excellent curl properties of the composite fiber.

Key words: composite fiber, elastic fiber, poly(ethylene terephthalate), poly(trimethylene terephthalate), mechanical property, crimp property

CLC Number: 

  • TS15

Fig.1

Specific spinning process route"

Tab.1

Sample specifications"

试样编号 速度/(m·min–1) 牵伸倍
率/倍
热辊1 热辊2
Y–0 — — —
Y–1 1 450 3 400 2.35
Y–2 1 450 3 770 2.60
Y–3 1 450 4 130 2.85
Y–4 1 450 4 570 3.15
Y–5 1 450 4 860 3.35

Fig.2

DSC curves of composite fibers"

Tab.2

Crystallinity of each component in composite fibers％"

试样编号 结晶度
PET组分 PTT组分
Y–0 59.57 57.16
Y–1 43.04 40.76
Y–2 44.52 40.63
Y–3 45.23 39.81
Y–4 45.73 40.20
Y–5 44.37 40.39

Fig.3

Two-dimensional WAXD pattern of composite fibers"

Fig.4

One-dimensional WAXD intensity distribution of composite fibers"

Tab.3

Orientation of crystalline, amorphous regions and sound velocity of composite fibers"

试样编号 取向因子 声速/
(km·s–1)
晶区 非晶区
Y–0 — 0.759 —
Y–1 0.823 0.862 1.96
Y–2 0.864 0.879 2.27
Y–3 0.880 0.831 2.41
Y–4 0.892 0.836 2.16
Y–5 0.889 0.839 1.21

Tab.4

Mechanical properties of composite fibers"

试样编号 弹性模量/
(cN·dtex–1)		 断裂强度/
(cN·dtex–1)		 断裂伸
长率/％
Y–1 16.8 2.9 52.6
Y–2 18.4 3.1 51.5
Y–3 20.2 3.2 49.8
Y–4 20.9 3.4 43.8
Y–5 23.1 3.5 38.6

Fig.5

Crimp properties at different draft ratios. (a)Crimp shrinkage rate;(b)Crimp modulus;(c)Crimp stability"

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