液体冷却工艺对聚偏氟乙烯单丝结构及性能的影响
Effect of liquid cooling process on structure and properties of polyvinylidene fluoride monofilament
徐燕 1马海燕 2马海军1
作者信息
- 1. 南通新帝克单丝科技股份有限公司,江苏 南通 226003
- 2. 南通新帝克单丝科技股份有限公司,江苏 南通 226003;南通大学 化学化工学院,江苏 南通 226003
- 折叠
摘要
采用聚偏氟乙烯(PVDF)切片通过熔融纺丝制备PVDF单丝,根据PVDF切片的熔点确定纺丝温度范围,重点研究液体冷却工艺对PVDF初生丝结构与性能,以及PVDF单丝力学性能的影响.结果表明:PVDF切片的熔点为 176℃,合适的纺丝温度为 200～230℃;液体冷却温度为 40～70℃条件下,PVDF初生丝形成的晶体结构一样,都是α晶型;液体冷却温度为 50℃时PVDF结晶成核和晶体生长速率都较快,PVDF初生丝的结晶较完善,结晶度达55.7%,(100)晶面的晶粒尺寸为42 nm,有利于后道拉伸;随着液体冷却温度的升高,PVDF单丝的断裂强度呈先增后降的变化趋势,在喷丝头拉伸倍数为 8、液体冷却温度为50℃时纺丝稳定性最好,PVDF单丝的断裂强度、断裂伸长率最高,分别为5.57 cN/dtex、35%.
Abstract
Polyvinylidene fluoride(PVDF)monofilaments were prepared from PVDF chip by melt spinning.The spinning tem-perature range was determined based on the melting point of PVDF chip.And the influence of liquid cooling process on the struc-ture and properties of as-spun PVDF filaments and the mechanical properties of PVDF monofilaments was studied.The results showed that the appropriate spinning temperature was 200-230℃when the melting point of PVDF chip was 176℃;the as-spun PVDF fibers formed the same crystal structure of α crystal form at a liquid cooling temperature of 40-70℃;the nucleation and crystal growth rate of PVDF were relatively high and the as-spun PVDF fiber exhibited relatively perfect crystalline structure with a crystallinity of 55.7%and the grain size of 42 nm at crystal plane(100),which was beneficial to the subsequent stretching,when the liquid cooling temperature was 50℃;the breaking strength of PVDF monofilament showed a first increasing and then decreasing trend as the liquid cooling temperature increased,and the spinning stability was optimized and the PVDF monofila-ment had the highest breaking strength and elongation at break of 5.57 cN/dtex and 35%,respectively,when the stretching ratio of the spinneret was 8 and the liquid cooling temperature was 50℃.
关键词
聚偏氟乙烯纤维/单丝/液体冷却/结晶结构/力学性能Key words
polyvinylidene fluoride fiber/monofilament/liquid cooling/crystalline structure/mechanical properties引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据