不同温度下锦纶6工业丝的蠕变机制

doi:10.13475/j.fzxb.20231206301

纺织学报 ›› 2025, Vol. 46 ›› Issue (04): 63-70.doi: 10.13475/j.fzxb.20231206301

不同温度下锦纶6工业丝的蠕变机制

何灏¹^,², 张迎亮¹^,², 刘宸君¹^,², 殷亚然¹^,², 陈康¹^,²(), 张先明¹^,²

1.浙江理工大学材料科学与工程学院, 浙江杭州 310018
2.浙江省现代纺织技术创新中心, 浙江绍兴 312030

收稿日期:2023-12-29 修回日期:2024-05-23 出版日期:2025-04-15 发布日期:2025-06-11
通讯作者: 陈康(1993—),男,讲师,博士。主要研究方向为纤维成形工艺。E-mail:chenkang@zstu.edu.cn。
作者简介:何灏(1999—),男,硕士生。主要研究方向为海洋服役条件下锦纶6工业丝的结构性能演变。
基金资助:
浙江省“尖兵”、“领雁”研发攻关计划项目(2024C01083);“领雁”研发攻关计划项目(2023C01095);浙江省博士后科研择优资助项目(ZJ2023093);浙江理工大学科研启动基金项目(21212305-Y)

Creep properties and mechanism of polyamid 6 industrial fiber at different temperatures

HE Hao¹^,², ZHANG Yingliang¹^,², LIU Chenjun¹^,², YIN Yaran¹^,², CHEN Kang¹^,²(), ZHANG Xianming¹^,²

1. School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
2. Zhejiang Provincial Innovation Center of Advance Textiled Technology, Shaoxing, Zhejiang 312030, China

Received:2023-12-29 Revised:2024-05-23 Published:2025-04-15 Online:2025-06-11

摘要/Abstract

摘要： 为探究锦纶6工业丝在不同温度区间的蠕变行为及形变机制,借助广角X射线衍射(WAXD)、小角X射线散射、双折射等测试研究了样品在0~150 ℃温度条件下蠕变前后的微观结构变化。结果表明:样品蠕变形变率均随着蠕变温度升高呈增大的趋势,卸去蠕变负荷后的弹性回复率与蠕变速率在温度低于玻璃化转变温度时基本保持不变,当蠕变温度处于玻璃化转变温度以上时弹性回复率降低,蠕变速率增加。卸去负荷后结晶度与晶区取向度均未发生明显变化,说明稳定的晶区结构在撤去蠕变负荷后均可完全回复;蠕变过程后锦纶6工业丝样品非晶区取向、片晶厚度和玻璃化转变温度均略有增加,部分取向程度较低的非晶区分子链在蠕变负荷下进一步发生形变而形成了取向的非晶区;在蠕变温度高于玻璃化转变温度的条件下,非晶区分子链的运动能力增强,导致变化程度更为明显。

关键词: 锦纶6工业丝, 结晶结构, 片晶结构, 蠕变性能, 蠕变机制

Abstract:

Objective With the continuous expansion of polyamid 6 industrial fiber in engineering applications, it is very important to know the creep properties and the corresponding creep deformation mechanism of polyamid 6 industrial fiber under different conditions. In order to explore the difference of creep behavior and the corresponding deformation mechanism of polyamid 6 industrial fiber in different temperature ranges, the structure and properties of samples obtained under different creep temperature conditions were compared.MethodSynchrotron radiation wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) were adopted to compare and analyze the morphological and structural changes before and after creep process. To determine the relationship between creep performance parameters and multilayer structure parameters at different creep temperatures, the creep mechanism of polyamid 6 industrial fiber under different conditions was analyzed.

Results Polyamid 6 industrial fiber was simulated for creep at different ambient temperatures under the creep load of 40%ABL (average breaking load). When the creep temperature reached 160 ℃ and above, the sample showed fracture during the creep process. Nylon 6 industrial fiber exhibitd different creep properties at glass transition temperature. The initial creep strain, total creep strain, elastic creep strain and plastic creep strain of polyamid 6 industrial fiber increased with increasing creep temperature. When the creep temperature was below the glass transition temperature, the elastic recovery rate of the sample was basically unchanged and close to 99%. The creep rate wasincreased slowly, and the creep resistance of the sample was good. When the creep temperature was above the glass transition temperature, the elastic recovery rate decreased rapidly. The creep rate increased obviously, and the creep resistance of the sample was poor. Polyamid 6 industrial fiber exhibited different creep mechanism at glass transition temperature. The crystal orientation of polyamid 6 industrial fiber region is basically unchanged after the creep process, while the structure of amorphous region changes with the change of creep temperature. The creep behavior of nylon 6 industrial fiber under the creep temperature of not more than 150 ℃ was found to depend mainly on the amorphous structure. With the increase of creep temperature, the amorphous orientation and the whole orientation of polyamid 6 industrial fiber increased. The glass transition temperature of polyamid 6 industrial fiber was also increased. The molecular chains in the amorphous region were oriented along the creep deformation, and the molecular chains in the amorphous region with a small degree of orientation were gradually stretched and cannot be completely recovered, and the lamellar thickness increases. When the creep temperature exceeded the glass temperature, the kinetic capacity of the molecular chains in the amorphous region was enhanced.

Conclusion The creep deformation of the samples increases with the increase of the creep temperature. The elastic recovery rate and creep rate after removing the creep load are basically unchanged when the temperature is below 100 ℃, and the creep temperature is significantly decreased and increased when the creep temperature is exceeded 100 ℃ (higher than the glass transition temperature). The stable crystal structure can recover completely after the creep load is removed. After the creep process, the orientation of the amorphous region, the thickness of the lamellar and the glass transition temperature of the sample increased slightly. Some of the molecular chains of the amorphous region with low orientation degree were further deformed under the creep load and formed the oriented amorphous region. When the creep temperature is higher than 100 ℃, the motility of the molecular chains in the amorphous region is enhanced, resulting in a more obvious degree of change.

Key words: polyamid 6 industrial fiber, crystalline structure, lamellar structure, creep property, creep mechanism

中图分类号:

TS102

何灏, 张迎亮, 刘宸君, 殷亚然, 陈康, 张先明. 不同温度下锦纶6工业丝的蠕变机制[J]. 纺织学报, 2025, 46(04): 63-70.

HE Hao, ZHANG Yingliang, LIU Chenjun, YIN Yaran, CHEN Kang, ZHANG Xianming. Creep properties and mechanism of polyamid 6 industrial fiber at different temperatures[J]. Journal of Textile Research, 2025, 46(04): 63-70.

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链接本文: http://www.fzxb.org.cn/CN/10.13475/j.fzxb.20231206301

http://www.fzxb.org.cn/CN/Y2025/V46/I04/63

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PA6	不同温度下样品的A_{1 124}/A_{2 940}
PA6	0 ℃	30 ℃	80 ℃	100 ℃	120 ℃	130 ℃	140 ℃	150 ℃
0.29	0.35	0.28	0.28	0.31	0.26	0.30	0.31	0.30

不同温度下锦纶6工业丝的蠕变机制

Creep properties and mechanism of polyamid 6 industrial fiber at different temperatures

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