Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (06): 1-7.doi: 10.13475/j.fzxb.20180507007

• Fiber Materials •     Next Articles

Synthesis and characterization of bio-based polyamide 56 oligomer modified polyester

ZHANG Tengfei1, SHI Ludan2, HU Hongmei1, WANG Yu1, WANG Xueli3(), YU Jianyong3   

  1. 1. College of Textiles, Donghua University, Shanghai 201620, China
    2. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
    3. Innovation Center For Textile Science and Technology, Donghua University, Shanghai 201620, China
  • Received:2018-05-29 Revised:2019-03-14 Online:2019-06-15 Published:2019-06-25
  • Contact: WANG Xueli E-mail:wxl@dhu.edu.cn

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Abstract:

In view of the poor hydrophilicity of polyester (PET), a novel polyamide ester copolymer was prepared by copolymerization modification of PET with bio-based polyamide 56 oligomer (LPA56). Structure and properties of the novel polyamide esters were characterized and analyzed by nuclear magnetic resonance spectrometer, Fourier transform infrared spectroscopy, X-ray diffractometer and optical contact angle measuring instrument. The results show that the novel polyamide esters have functional peaks of both esters and amides, and the reaction rate of LPA56 is over 80%. The copolymers and polyesters have the same crystal form. However, the crystallinity decreases with the increase of the amount of LPA56 added. The glass transition temperature and melting point of the copolymer gradually decrease with the increase of the amount of LPA56 added, but the thermal stability of the copolymer is less affected. When 5% LPA56 is added, the static contact angle is greatly reduced from 91.5° to 70.3°, and the fiber moisture regain is 265% of the pre-modified PET fiber, and gradually increases with the amount of LPA56 added.

Key words: polyamide 56, polyamide ester, modified polyester, crystallinity, hydrophilic property

CLC Number: 

  • TQ342.21

Fig.1

Polyamide ester reaction"

Tab.1

Feed ratio of raw material"

样品编号 PTA用量/
mol		 EG用量/
mol		 聚酰胺56低聚物
占比/%
0# 12 16.8 0
1# 12 16.8 5
2# 12 16.8 10
3# 12 16.8 15

Fig.2

1H-NMR spectra of polyamide ester"

Fig.3

Structure of polyamide ester labeled with hydrogen elements at different locations"

Tab.2

Reaction rate of LPA56%"

样品编号 理论μLPA56 实际μLPA56 反应率
1# 0.040 0.032 80.0
2# 0.079 0.071 89.9
3# 0.114 0.108 91.2

Fig.4

13C-NMR spectrum of polyamide ester"

Fig.5

Structural formula of polyamide ester"

Fig.6

FT-IR spectra of polyamide ester"

Fig.7

XARD spectra of polyamide ester"

Tab.3

XARD parameter table of polyamide ester"

样品编号 晶面间距/nm 结晶度/%
(010) (11ˉ0) (100)
0# 5.05 3.86 3.44 33.69
1# 5.14 3.90 3.43 27.74
2# 4.96 3.85 3.38 26.80
3# 4.92 3.85 3.39 25.26

Fig.8

DSC spectra of polyamide ester"

Fig.9

TG and DTG curves of polyamide ester"

Fig.10

Static contact angle of polyamide ester"

Fig.11

Hydrophilic principle of polyamide ester"

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