后加工中热处理张力变化对高模低收缩涤纶工业丝结构与性能影响

doi:10.13475/j.fzxb.20210803807

纺织学报 ›› 2022, Vol. 43 ›› Issue (10): 10-15.doi: 10.13475/j.fzxb.20210803807

后加工中热处理张力变化对高模低收缩涤纶工业丝结构与性能影响

陈康¹^,², 陈高峰³, 王群³, 王刚³, 张玉梅²(), 王华平²

1.浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室, 浙江杭州 310018
2.东华大学纤维材料改性国家重点实验室, 上海 201620
3.浙江尤夫高新纤维股份有限公司, 浙江湖州 313017

收稿日期:2021-08-06 修回日期:2022-03-23 出版日期:2022-10-15 发布日期:2022-10-28
通讯作者: 张玉梅
作者简介:陈康(1993—),男,讲师,博士。主要研究方向为涤纶工业丝服役特性及其构效关系。
基金资助:
国家重点研发计划项目(2016YFB0303004);中国纺织工业联合会科技指导性项目(2021003)

Influence of heat-treatment tension in post-processing on structural properties of high modulus low shrinkage industrial polyester fibers

CHEN Kang¹^,², CHEN Gaofeng³, WANG Qun³, WANG Gang³, ZHANG Yumei²(), WANG Huaping²

1. State-Locality Joint Engineering Laboratory of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
3. Zhejiang Unifull Industrial Fiber Co., Ltd., Huzhou, Zhejiang 313017, China

Received:2021-08-06 Revised:2022-03-23 Published:2022-10-15 Online:2022-10-28
Contact: ZHANG Yumei

摘要/Abstract

摘要：

针对后加工热处理过程中高模低收缩型(HMLS)涤纶工业丝受热引起性能变化的问题,分别将HMLS涤纶工业丝置于150 ℃不同预加张力(0~0.10 cN/dtex)条件下热处理5 min,分析热处理前后样品的构象变化,阐明其性能调控的结构因素。结果表明:随着预加张力的减小,HMLS涤纶工业丝的断裂强度略有减小,初始模量和5%形变下的断裂强度明显降低,而断裂伸长率明显增大;热处理主要影响非晶区的结构变化,导致HMLS涤纶工业丝的非晶区取向变低、反式构象含量变小、片晶长周期变小以及非晶区厚度变小;可通过施加一定的预加张力有效抵消HMLS涤纶工业丝在后加工中受热时的收缩应力,从而降低非晶区分子链的运动能力,使得力学性能及非晶区结构变化幅度减小。

关键词: 高模低收缩型涤纶工业丝, 热处理, 热处理张力, 微观结构, 力学性能

Abstract:

This research investigates the influence of heat-treatment tension on structural properties of high modulus low shrinkage (HMLS) industrial polyester fibers in post-processing. HMLS industrial polyester fibers was subjected to heat treatment with various tensions (0-0.10 cN/dtex) at 150 ℃ for 5 min. The conformational changes of the samples before and after the heat treatment were analyzed, and the structural factors regulating their properties were discussed. The results show that with the decrease of pre-tension, the breaking strength remains basically unchanged, the tenacity decreases slightly, the initial modulus and the tenacity at the specific elongation of 5.0% decreased obviously, and ultimate elongation increased significantly. The microstructure changes caused by the heat-treatment mainly occur in the amorphous chains, causing lower orientation in the amorphous region, lower trans conformation content, smaller lamellar long period and smaller amorphous thickness. The presence of pre-tension can effectively offset the shrinkage stress of the fiber, decreasing the mobility of molecular chains in the amorphous region, and the degree of mechanical properties and structure changes in the amorphous region is reduced.

Key words: high modulus low shrinkage industrial polyester fiber, heat treatment process, heat-treatment tension, microstructure, mechanical property

中图分类号:

TQ341.5

陈康, 陈高峰, 王群, 王刚, 张玉梅, 王华平. 后加工中热处理张力变化对高模低收缩涤纶工业丝结构与性能影响[J]. 纺织学报, 2022, 43(10): 10-15.

CHEN Kang, CHEN Gaofeng, WANG Qun, WANG Gang, ZHANG Yumei, WANG Huaping. Influence of heat-treatment tension in post-processing on structural properties of high modulus low shrinkage industrial polyester fibers[J]. Journal of Textile Research, 2022, 43(10): 10-15.

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样品编号	断裂强力/ N	断裂强度/ (cN· dtex^-1)	断裂伸长率/%	初始模量/ (cN· dtex^-1)	L₅/ (cN· dtex^-1)	E₄/ %
HMLS	83.5	7.6	11.4	110.7	3.8	5.3
HMLS-1	82.5	7.0	15.0	75.2	1.7	9.6
HMLS-2	81.9	7.1	14.4	76.6	1.9	9.0
HMLS-3	81.7	7.1	14.4	78.0	2.0	8.7
HMLS-4	80.7	7.1	13.8	79.1	2.2	8.0
HMLS-5	81.7	7.3	12.6	89.5	2.7	6.9

样品编号	变化率/%
样品编号	断裂强力	断裂强度	断裂伸长率	初始模量	L₅	E₄
HMLS-1	-1.2	-8.2	31.6	-32.1	-54.7	92.5
HMLS-2	-1.9	-6.9	26.3	-30.8	-50.7	81.1
HMLS-3	-2.2	-5.8	26.3	-29.5	-48.2	62.3
HMLS-4	-3.4	-6.2	21.1	-28.5	-41.5	64.2
HMLS-5	-2.2	-4.4	10.5	-19.1	-28.0	30.2

样品编号	结晶度/ %	(010) 晶粒尺寸/ nm	(10) 晶粒尺寸/ nm	双折射率 (Δn)	晶区取向度 (f_c)	非晶区取向度 (f_a)
HMLS	63	5.2	3.1	0.204	0.94	0.72
HMLS-1	62	5.3	3.1	0.196	0.93	0.66
HMLS-2	63	5.3	2.9	0.198	0.93	0.68
HMLS-3	62	5.3	2.9	0.198	0.93	0.68
HMLS-4	63	5.3	2.9	0.200	0.95	0.67
HMLS-5	62	5.2	2.9	0.204	0.95	0.71

样品编号	长周期/ nm	片晶厚度/nm	非晶区厚度/nm	片晶直径/nm	片晶倾斜角/(°)
HMLS	13.9	7.0	6.9	9.05	41.3
HMLS-1	13.1	6.6	6.5	9.43	39.9
HMLS-2	13.3	6.7	6.6	9.37	41.0
HMLS-3	13.3	6.8	6.5	9.25	40.6
HMLS-4	13.4	6.8	6.6	9.31	41.0
HMLS-5	13.7	7.0	6.7	9.19	41.0

后加工中热处理张力变化对高模低收缩涤纶工业丝结构与性能影响

Influence of heat-treatment tension in post-processing on structural properties of high modulus low shrinkage industrial polyester fibers

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