Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (12): 1-8.doi: 10.13475/j.fzxb.20181202008

• Fiber Materials •     Next Articles

Preparation and characterization of cellulose acetate sub-micro fiber from burley tobacco stalk pulp

WU Jiajun, QIN Xiaohong()   

  1. College of Textiles, Donghua University, Shanghai 201620, China
  • Received:2018-12-07 Revised:2019-05-28 Online:2019-12-15 Published:2019-12-18
  • Contact: QIN Xiaohong E-mail:xhqin@dhu.edu.cn

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Abstract:

In order to prepare cellulose diacetate (CDA) from burley tobacco stalk pulp (TSP) and measure its spinnability, cellulose triacetate (CTA) and CDA were prepared from burley TSP by low-temperature acetylation using acetic anhydride and sulfuric acid as catalyst. The prepared CDA was mixed with commercial CDA at a mass ratio of 20∶80, 35∶65 and 50∶50, respectively, and electrospinning was applied to spin the fibers. The structure and properties of the fibers were characterized. The result shows that with reaction time of 5 h, pulp to acetic acid sold-liquid ratio of 1∶5 and addition of sulfuric acid during activation procedure, the degree of substitution of TSP cellulose acetate increases from 2.68 to 2.86, which meets the requirements of CTA. TSP cellulose diacetate with degree of substitution about 2.5 is obtained by hydrolysis at 80 ℃ for 6 h. Compared with sub-micron blended fibers obtained from pure electrospun commercial CDA, the fiber diameter and unevenness of blended fibers of TSP cellulose diacetate and commercial CDA both reduce, proving the feasibility of blended spinning of TSP cellulose diacetate.

Key words: cellulose acetate, tobacco stalk dissolving pulp, acetylation, hydrolysis, electrospinning

CLC Number: 

  • TQ353.21

Fig.1

Shape of different pulps"

Tab.1

Comparison of four pulp properties"

木浆名称 成分含量/% 黏度/
(mPa·s)		 灰分含
量/%		 水分含
量/%		 白度/% 纤维长
度/mm
葡聚糖 木聚糖 木质素 甘露糖
TSP 93.7±0.5 2.4±0.1 0.4±0.0 0.0±0.0 5.9 0.15±0.01 6.81±0.53 89.0±0.4 0.43
HWP 79.5±0.1 13.6±0.1 2.2±0.2 0.0±0.0 17.6 0.33±0.06 5.03±0.32 85.7±0.2 0.70
DPA 95.7±0.6 1.7±0.2 0.3±0.0 1.4±0.1 30.4 0.21±0.02 5.97±0.22 92.3±0.4 1.37
DPB 95.4±0.1 1.6±0.2 0.3±0.0 1.0±0.2 19.1 0.27±0.02 5.48±0.14 92.1±0.4 1.43

Fig.2

Acetylated solution turbidity change with different reaction time"

Fig.3

Tubidity value of solution under different soild-liquid ratio"

Fig.4

Fourier transform infrared spectra of TSP, TSP filter residue and TSP cellulose triacetate"

Fig.5

TG (a) and DTG (b) curves of TSP, TSP cellulose triacetate and commercial CTA"

Tab.2

Degree of substitution of various source of CTA by titration"

试样名称 V1 /mL V2 /mL CAV /% 水分/% X
TSP对比样 6.36±0.04 0.57±0.01 58.52±0.40 1.10±0.05 2.68±0.02
TSP 6.58±0.03 0.57±0.01 61.31±0.31 1.15±0.01 2.86±0.03
HWP 6.71±0.03 0.57±0.01 62.00±0.31 0.96±0.01 2.95±0.03
DPA 6.70±0.04 0.57±0.01 62.02±0.20 1.17±0.01 2.96±0.03
DPB 6.51±0.03 0.62±0.01 60.78±0.31 3.09±0.01 2.86±0.03
市售 CTA 6.70±0.03 0.57±0.01 61.58±0.15 0.46±0.01 2.92±0.02

Fig.6

CTA morphology and their chromogenic mechanism. (a) CTA samples made from various pulps; (b) Furfural formation mechanism from xylose in pulp"

Fig.7

Relation between commercial CTA degree of substitution value and hydrolysis time"

Tab.3

Degree of substitution value of various source of CDA by titration"

试样
名称		 V1 /mL V2 /mL CAV /% 水分/% X
TSP
对比样		 6.02±0.01 0.49±0.02 57.00±0.06 3.06±0.02 2.56±0.02
HWP 6.20±0.01 0.49±0.02 59.05±0.01 3.30±0.02 2.72±0.01
DPA 6.00±0.02 0.50±0.02 56.91±0.18 3.35±0.01 2.55±0.02
DPB 5.76±0.03 0.49±0.02 55.90±0.26 5.81±0.01 2.48±0.02
市售
CDA		 6.05±0.03 0.60±0.05 55.45±0.30 1.71±0.01 2.45±0.03

Fig.8

Cellulose diacetate made from different pulps"

Fig.9

SEM images of electrospun TSP cellulose diacetate and commercial CDA with different blending ratios"

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