Study on annealing process of polylactic acid melt blown microfibrous for medical packaging

doi:10.19491/j.issn.1001-9278.2025.06.006

Abstract

Abstract:

To enhance the mechanical performance of polylactic acid （PLA）⁃based melt⁃blown microfibrous materials for medical packaging， PLA/PCL@EBS melt⁃blown microfibrous samples were subjected to annealing. The structural morphology， crystallinity， and mechanical properties of the samples were systematically characterized. The results indicated that the annealing action reduced fiber diameter， with 72.0 % of fibers falling within a 6 µm diameter range at elevated annealing temperatures. Increasing the annealing temperature from 60 to 80 ℃ significantly improved crystallinity， rising from 5.1 % to 29.7 %. Concurrently， mechanical properties were enhanced： machine⁃direction and cross⁃direction fracture strengths increased from 16.4 and 3.4 N/5 cm to 30.9 and 8.4 N/5 cm， respectively， while top⁃break strength improved from 10.1 N/5 cm to 18.9 N/5 cm. Response surface methodology further revealed optimal mechanical performance at an annealing temperature of 70 °C and a duration of 30 minutes.

Key words: poly（lactic acid）, melt blown microfibrous, annealing process, mechanical property, medical packaging

CLC Number:

TQ321

ZHEN Qi, QIN Zixuan, ZHANG Heng, CUI Jingqiang, WANG Guofeng, CHENG Wensheng, LI Han. Study on annealing process of polylactic acid melt blown microfibrous for medical packaging[J]. China Plastics, 2025, 39(6): 24-30.

Figures/Tables 9

References 17

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样品	单位面积质量/g•m^-2	厚度/mm	孔隙率/%
未处理	95.1	0.717	83.2
1	93.0	0.675	81.4
2	89.1	0.630	84.7
3	84.5	0.595	85.2
4	78.0	0.534	88.1
5	74.6	0.520	89.6
6	93.1	0.690	83.4
7	91.0	0.655	86.2
8	90.7	0.611	87.6
9	90.1	0.583	89.5
10	89.2	0.546	91.3

样品	单位面积质量/g•m^-2	厚度/mm	孔隙率/%
未处理	95.1	0.717	83.2
1	93.0	0.675	81.4
2	89.1	0.630	84.7
3	84.5	0.595	85.2
4	78.0	0.534	88.1
5	74.6	0.520	89.6
6	93.1	0.690	83.4
7	91.0	0.655	86.2
8	90.7	0.611	87.6
9	90.1	0.583	89.5
10	89.2	0.546	91.3

样品	纵向断裂强度/N•（5cm）^-1	纵向断裂伸长率/%	横向断裂强度/N•（5cm）^-1	横向断裂伸长率/%	顶破强度/N•（5cm）^-1
未处理	12.8	39.1	2.6	28.1	5.7
1	16.4	18.9	3.4	16.1	10.1
2	25.0	17.6	4.8	17.0	12.5
3	29.9	15.2	5.0	24.4	13.4
4	30.1	13.7	5.8	25.7	15.4
5	30.9	13.5	8.4	32.4	18.9
6	23.1	18.7	4.6	13.2	9.8
7	25.2	16.2	4.9	17.4	10.2
8	27.3	15.9	5.0	19.6	10.5
9	29.9	13.9	5.3	22.4	11.0
10	31.0	13.1	7.2	26.8	12.5

样品	纵向断裂强度/N•（5cm）^-1	纵向断裂伸长率/%	横向断裂强度/N•（5cm）^-1	横向断裂伸长率/%	顶破强度/N•（5cm）^-1
未处理	12.8	39.1	2.6	28.1	5.7
1	16.4	18.9	3.4	16.1	10.1
2	25.0	17.6	4.8	17.0	12.5
3	29.9	15.2	5.0	24.4	13.4
4	30.1	13.7	5.8	25.7	15.4
5	30.9	13.5	8.4	32.4	18.9
6	23.1	18.7	4.6	13.2	9.8
7	25.2	16.2	4.9	17.4	10.2
8	27.3	15.9	5.0	19.6	10.5
9	29.9	13.9	5.3	22.4	11.0
10	31.0	13.1	7.2	26.8	12.5

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