Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (10): 81-86.doi: 10.13475/j.fzxb.20191106806

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation of phosphorylated-caproylated starch and its membrane properties

LI Wei1(), ZHANG Zhengqiao1, WU Lanjuan1, XU Zhenzhen1, NI Qingqing2, LU Yuhao3   

  1. 1. College of Textiles and Garments, Anhui Polytechnic University, Wuhu, Anhui 241000, China
    2. Faculty of Textile Science and Technology, Shinshu University, Nagano 3868567, Japan
    3. Hefei Safood Starch Co., Ltd., Hefei, Anhui 230000, China
  • Received:2019-11-28 Revised:2020-06-15 Online:2020-10-15 Published:2020-10-27

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Abstract:

In order to reduce the brittleness of starch membrane for promoting the application effect of starch in warp sizing, starch was phosphorylated with sodium tripolyphosphate and then caproylated with caproic anhydride. The influence of double esterification on the tensile properties of starch membrane was investigated in terms of tensile strength, elongation at break and time required for breaking the membrane. The starch membranes before and after modification were analyzed using X-ray diffraction. The experimental results show that the phosphorylation-caproylation could not only reduce the crystallinity of starch membrane, significantly increase the elongation and decrease the strength of starch membrane, thus reducing the membrane brittleness and improving its toughness, but could also improve the water-solubility. With the increase in total degree of substitution from 0.028 to 0.059, the elongation of phosphorylation-caproylation starch (PCS) membrane increases from 3.15% to 3.91% and the strength decreases from 32.8 MPa to 28.1 MPa, indicating the reduction of the brittleness is gradually enhanced.

Key words: starch, size, phosphorylation-caproylation, phosphorylated-caproylated starch, apparent viscosity, membrane property

CLC Number: 

  • TS103.846

Fig.1

Molecular structure of PCS"

Fig.2

FT-IR spectra of PCS and ACS"

Fig.3

SEM images of ACS and PCS granules(×1 500)"

Tab.1

Degrees of substitution and reaction efficiencies of PCS samples"

磷酸酯化 己酸酯化
STP用量/g Dp Rp/% CA用量/g Dx Rx/%
12 0.013 49.2 7.5 0.015 52.9
12 0.013 49.2 15.0 0.025 44.1
12 0.013 49.2 22.5 0.037 43.5
12 0.013 49.2 30.0 0.046 40.6

Fig.4

Influence of phosphorylation and caproylation on apparent viscosity of cooked starch paste"

Fig.5

Influence of phosphorylation and caproylation on tensile property of starch film"

Fig.6

XRD patterns of PCS and ACS films"

Fig.7

Influence of phosphorylation and caproylation on time required for breaking starch film in water"

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