Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (01): 9-14.doi: 10.13475/j.fzxb.20210909606

• Fiber Materials • Previous Articles     Next Articles

Synthesis and properties of bio-based liquid crystal copolyester fiber based on p-hydroxyphenyl propionic acid

LI Longlong1, WEI Peng1,2(), WU Cuixia1, YAN Jinfei1, LOU Hejuan1, ZHANG Yifeng1,2, XIA Yumin3, WANG Yanping3, WANG Yimin3   

  1. 1. College of Textiles, Zhongyuan University of Technology, Zhengzhou, Henan 450007, China
    2. Henan Collaborative Innovation Center of Textile and Garment Industry, Zhengzhou, Henan 450007, China
    3. College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
  • Received:2021-09-27 Revised:2021-11-02 Online:2022-01-15 Published:2022-01-28
  • Contact: WEI Peng E-mail:appletree0322@163.com

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Abstract:

In order to improve the mechanical property and thermal stability of bio-based polymers, the bio-based liquid crystal copolyester derived from 6-hydroxy-2-naphthenic acid, p-hydroxybenzoic acid and p-hydroxyphenyl propionic acid(HPPA) were studied and successfully synthesized via the one-pot melt polymerization method, and the structures and properties of the spun fibers from the bio-based liquid crystal copolyesters were prepared by melt spinning. The results show that the prepared bio-based liquid crystal copolyester is a nematic liquid crystal polymer. Its melting point is around 200 ℃, and it decreases with the increase of HPPA monomer content. High content of HPPA leads to weak melting behavior, which is not conducive to crystallization. The copolyesters show good thermal stability and high char yield, and the temperature corresponded to 5% weight loss and char yield at 700 ℃ are above 370 ℃ and 30%, respectively. The surface of the as spun copolyester fiber is smooth and uniform, the cross section has an obvious fibrillar structure. The fibers have good mechanical properties, which are negatively related to the content of HPPA.

Key words: bio-based liquid crystal polymer, melt polymerization, melt spinning, p-hydroxyphenyl propionic acid, bio-based fiber, p-hydroxybenzoic acid, copolyester fiber

CLC Number: 

  • O632

Tab.1

Composition of copolyesters%"

样品编号 HNA摩尔分数 HBA摩尔分数 HPPA摩尔分数
LCPH1 30 40 30
LCPH2 30 30 40
LCPH3 30 20 50

Fig.1

Reaction route of copolyesters"

Fig.2

FT-IR spectra of copolyester LCPH2"

Fig.3

Second DSC heating thermographs of copolyesters"

Fig.4

TGA (a) and DTG (b) curves of copolyesters"

Tab.2

Thermal stability test result of copolyesters"

样品编号 初始降解
温度/℃		 最大质量损失速率
对应的温度/℃		 残炭量/%
LCPH1 371 409 30
LCPH2 377 412 34
LCPH3 376 414 36

Fig.5

PLM images of copolyesters LCPH2 (×400)"

Fig.6

XRD spectra of copolyesters"

Fig.7

Dynamic rheological behavior (a)and apparent viscosity (b)under frequency scanning mode of copolyester LCPH2"

Fig.8

Surface and fracture morphology of copolyester fiber (×200)"

Fig.9

Tensile strain-stress curves of copolyesters fibers"

Tab.3

Mechanical property of copolyester fibers"

样品
编号		 直径/μm 断裂强度/
GPa		 弹性模量/
GPa		 断裂应变/
%
LCPH1 76.88±18.07 0.35±0.04 20.80±5.76 2.62±0.47
LCPH2 146.78±12.69 0.26±0.01 13.55±1.67 2.66±0.67
LCPH3 126.99±4.78 0.19±0.02 11.46±1.18 2.00±0.36
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