<italic style="font-style: italic">In situ</italic> Investigation of Crystallization Behavior of Nylon 6 under Rapid Pressurization

Jian Xu; Zi-pei Ding; Ya-xin Liu; Jia-yi Sun; Xue Yang; Lei Su; Chun-tai Liu; Chang-yu Shen; Chun-guang Shao

doi:10.11777/j.issn1000-3304.2025.25295

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In situ Investigation of Crystallization Behavior of Nylon 6 under Rapid Pressurization

Research Article | 更新时间：2026-04-01

- In situ Investigation of Crystallization Behavior of Nylon 6 under Rapid Pressurization
- Acta Polymerica Sinica Vol. 57, Issue 4, Pages: 963-972(2026)
- 作者机构：
  
  1.郑州大学材料成型及模具技术教育部重点实验室橡塑模具国家工程研究中心郑州 450002
  2.北京高压科学研究中心北京 100080
- 作者简介：
  
  Chun-guang Shao, E-mail: shaochg@zzu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25295
  CLC：
- CSTR：32057.14.GFZXB.2025.7534
- Received：03 November 2025，
  
  Accepted：11 December 2025，
  
  Online First：27 January 2026，
  
  Published：20 April 2026
- 稿件说明：
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徐剑, 丁子培, 刘雅欣, 孙佳怡, 杨雪, 苏磊, 刘春太, 申长雨, 邵春光. 原位研究快速增压条件下尼龙6的结晶行为. 高分子学报, 2026, 57(4), 963-972.

Xu, J., Ding, Z. P., Liu, Y. X., Sun, J. Y., Yang, X., Su, L., Liu, C. T., Shen, C. Y., Shao, C. G. In situ investigation of crystallization behavior of nylon 6 under rapid pressurization. Acta Polymerica Sinica (in Chinese), 2026, 57(4), 963-972.
徐剑, 丁子培, 刘雅欣, 孙佳怡, 杨雪, 苏磊, 刘春太, 申长雨, 邵春光. 原位研究快速增压条件下尼龙6的结晶行为. 高分子学报, 2026, 57(4), 963-972. DOI： 10.11777/j.issn1000-3304.2025.25295. CSTR： 32057.14.GFZXB.2025.7534.

Xu, J., Ding, Z. P., Liu, Y. X., Sun, J. Y., Yang, X., Su, L., Liu, C. T., Shen, C. Y., Shao, C. G. In situ investigation of crystallization behavior of nylon 6 under rapid pressurization. Acta Polymerica Sinica (in Chinese), 2026, 57(4), 963-972. DOI： 10.11777/j.issn1000-3304.2025.25295. CSTR： 32057.14.GFZXB.2025.7534.

摘要

聚合物高压结晶的驱动力是过冷度，从尼龙6 (PA6)的压力-熔点相图上看，足够大的压力(目标压力)能够带来足够高的过冷度从而使其在增压过程中结晶. 本工作利用自制的变速金刚石压机(s-dDAC)对PA 6进行快速增压处理(增压速率为1 GPa/s)，联合多种结构检测手段原位研究了目标压力对PA6结晶行为的影响. 结果表明：目标压力对PA 6的结晶晶型及结晶过程均有显著调控作用，当目标压力≤2.5 GPa时，熔体无法在增压过程中完全凝固，存在结晶滞后现象，制得的样品是以

相为主含有少量

相的混合相；当目标压力≥3.0 GPa时，结晶滞后现象消失，样品转变为以

相为主、含有少量

相的混合相. 不同的目标压力下，PA6熔体开始固化的临界压力几乎不变(340 MPa左右)，当目标压力≥3.0 GPa时，PA6熔体能够在340 MPa~2.7 GPa的“压力窗口”内连续固化. 卸压过程中，

晶的体积连续膨胀，并伴随着少量晶体的破坏. 本工作利用快速增压法制备了含

相的PA6制品，原位观测了其加压形成过程和卸压破坏过程，证实了通过改变增压条件不仅能够控制PA6的结晶动力学，还能够制备出具有特殊结构的制品.

Abstract

The driving force for high-pressure crystallization of polymers is undercooling. According to the pressure-melting point phase diagram of nylon 6 (PA6)

sufficient pressure (target pressure) can generate adequate undercooling to induce crystallization during pressurization. In this work

a self-designed variable-speed diamond anvil cell (s-dDAC) was employed to subject PA6 to rapid pressurization tr

eatment at a pressurization rate of 1 GPa/s. The effect of target pressure on the crystallization behavior of PA6 was investigated

in situ

using multiple structural characterization techniques. The results demonstrated that target pressure significantly influenced both the crystal polymorphism and crystallization process of PA6. When the target pressure was ≤2.5 GPa

the melt could not completely solidify during pressurization

exhibiting crystallization lag

and the resulting samples consist of a mixed phase dominated by

-phase with minor

-phase content. When the target pressure was ≥3.0 GPa

the crystallization lag disappears

and the samples comprise a mixed phase dominated by

-phase with minor

-phase content. Regardless of target pressure

the critical pressure at which PA6 melt initiated solidification remains nearly constant at approximately 340 MPa. When the target pressure was ≥3.0 GPa

PA6 melt can continuously solidify within a "pressure window" ranging from 340 MPa to 2.7 GPa. During depressurization

the volume of

-phase crystals continuously expanded

accompanied by partial crystal destruction. This work represents the first successful preparation of

-phase-containing PA6 products

via

rapid pressurization method

with

in situ

observation of both the pressurization-induced formation process and depressurization-induced destruction process

demonstrating that modulating pressurization conditions can not only control the crystallization kinetics of PA6 but also enable the fabrication of products with distinctive structures.

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Keywords

references

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⁰

In situ Investigation of Crystallization Behavior of Nylon 6 under Rapid Pressurization

DOI：10.11777/j.issn1000-3304.2025.25295

摘要

Abstract

关键词

Keywords

references