Study on enhancement modification of melt⁃differential electrospun poly（lactic acid） fiber with CH⁃S04

doi:10.19491/j.issn.1001-9278.2025.02.001

Abstract

Abstract:

In this study， an organic⁃inorganic compounded nucleating agent （CH⁃S04） was used to enhance the mechanical properties of poly（lactic acid）（PLA） microfibers. The non⁃isothermal crystallization behavior of the resultant PLA/CH⁃S04 fiber films as well as the action mechanism of CH⁃S04 in the multistage drafting process were studied under different spinning temperatures and voltages， and their mechanical properties of PLA/CH⁃S04 fiber films were characterized. The results indicated that when the spinning temperature was 220 ℃ and the spinning voltage was 50 kV， the degrees of crystallinity of PLA/CH⁃S04 fiber films reached maximum values of 27.12 % at a spinning temperature of 220 ℃ and 32.32 % at a spinning voltage of 50 kV， which were 18.53 % and 23.73 % higher than that of pure PLA fiber film， respectively. In different spinning receiving forms， CH⁃S04 achieved the best crystallization enhancing effect on PLA when applying voltage and air flow together with collecting by a roller. The resulting PLA/CH⁃S04 fiber film obtained a degree of crystallinity of 36.66 %， which was 28.07 % higher than that of pure PLA fiber film. The PLA/CH⁃S04 fiber film obtained tensile strength 12.33 MPa at a spinning temperature of 240 ℃ and a spinning voltage of 50 kV， which was 11.58 % higher than that of pure PLA fiber film.

Key words: electrospinning, poly（lactic acid）, melt, degree of crystallinity, mechanical strength

CLC Number:

TQ320.6

LI Wanlong, YANG Weimin, WANG Shuo, LI Changjin, ZHANG Yang, TAN Jing, YAN Hua, LI Haoyi. Study on enhancement modification of melt⁃differential electrospun poly（lactic acid） fiber with CH⁃S04[J]. China Plastics, 2025, 39(2): 1-5.

Figures/Tables 10

Fig.1. Melt differential electrospinning device

Fig.2. DSC temperature rise curves of the PLA/CH⁃S04 fiber membranes at different spinning temperature

纺丝温度/ ℃	T_g/℃	T_c/℃	∆H_cc/ J∙g^-1	T_m/℃	∆H_m/ J∙g^-1	X_c/%
210	57.07	83.39	22.27	169.48	45.52	25.09
220	58.56	84.85	24.09	171.85	48.75	26.61
230	59.53	87.43	25.93	173.55	47.07	22.81
240	56.53	86.13	28.36	167.97	44.66	17.59
250	55.00	85.79	27.90	167.95	43.37	16.69

Tab.1. DSC characteristics of non⁃isothermal crystallization of the PLA/CH⁃S04 fiber films at different spinning temperature

Fig.3. DSC temperature rise curves of the PLA/CH⁃S04 fiber films at different spinning voltage

纺丝电压/ kV	T_g/℃	T_c/℃	∆H_cc/ J∙g^-1	T_m/℃	∆H_m/ J∙g^-1	X_c/%
45.0	56.95	86.07	26.18	170.38	47.78	23.31
47.5	56.90	84.70	27.04	170.60	49.94	24.71
50.0	59.38	89.70	20.46	174.88	50.41	32.32
52.5	59.69	86.71	23.55	174.84	48.83	27.28
55.0	56.53	86.13	28.36	167.97	44.66	17.59

Tab.2. DSC characteristics of non⁃isothermal crystallization of the PLA/CH⁃S04 fiber films at different spinning voltage

Fig.4. Schematic diagrams of different spinning reception forms

Fig.5. DSC temperature rise curves of the PLA and PLA/CH⁃S04 fiber films prepared using different spinning receiving forms

测试样品	纺丝工艺	T_c/℃	∆H_cc/ J∙g^-1	T_m/℃	∆H_m/ J∙g^-1	X_c/%
PLA	A	101.92	32.12	172.75	47.36	16.28
	B	104.25	27.52	170.88	50.93	25.01
	C	92.03	22.11	171.13	52.35	32.31
PLA/CH⁃S04	A	91.12	19.81	170.35	36.08	17.56
	B	87.44	17.31	174.64	46.99	32.03
	C	90.85	15.93	175.82	49.90	36.66

Tab.3. DSC characteristics of the PLA and PLA/CH⁃S04 fiber films prepared using different spinning receiving forms

Fig.6. Changes of crystallinity of the PLA and PLA/CH⁃S04 fiber films prepared using different spinning receiving forms

Fig.7. Effect of spinning conditions on mechanical properties of the PLA/CH⁃S04 fiber films

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