分子链松弛在制备高性能双向拉伸聚丙烯薄膜中的重要作用

王岩旭; 李悦昊; 徐伟; 傅强

doi:10.11777/j.issn1000-3304.2025.25259

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分子链松弛在制备高性能双向拉伸聚丙烯薄膜中的重要作用

研究论文 | 更新时间：2026-01-16

- 分子链松弛在制备高性能双向拉伸聚丙烯薄膜中的重要作用
- The Important Role of Molecular Chain Relaxation in the Preparation of High-performance Biaxially Oriented Polypropylene Films
- 高分子学报 2026年57卷第1期页码：268-281
- 作者机构：
  
  1.四川大学高分子科学与工程学院先进高分子材料全国重点实验室成都 610065
  2.四川大学匹兹堡学院成都 610065
  3.宜宾天亿新材料科技有限公司宜宾 644000
- 作者简介：
  
  E-mail: qiangfu@scu.edu.cn
- 基金信息：
  
  国家自然科学基金(基金号 22341304)
- DOI：10.11777/j.issn1000-3304.2025.25259
  中图分类号：
- CSTR：32057.14.GFZXB.2025.7514
- 收稿：2025-10-11，
  
  录用：2025-11-10，
  
  网络出版：2025-12-19，
  
  纸质出版：2026-01-20
- 稿件说明：
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王岩旭, 李悦昊, 徐伟, 傅强. 分子链松弛在制备高性能双向拉伸聚丙烯薄膜中的重要作用. 高分子学报, 2026, 57(1), 268-281.

Wang, Y. X.; Li, Y. H.; Xu, W.; Fu, Q. The important role of molecular chain relaxation in the preparation of high-performance biaxially oriented polypropylene films. Acta Polymerica Sinica (in Chinese), 2026, 57(1), 268-281.
王岩旭, 李悦昊, 徐伟, 傅强. 分子链松弛在制备高性能双向拉伸聚丙烯薄膜中的重要作用. 高分子学报, 2026, 57(1), 268-281. DOI： 10.11777/j.issn1000-3304.2025.25259. CSTR： 32057.14.GFZXB.2025.7514.

Wang, Y. X.; Li, Y. H.; Xu, W.; Fu, Q. The important role of molecular chain relaxation in the preparation of high-performance biaxially oriented polypropylene films. Acta Polymerica Sinica (in Chinese), 2026, 57(1), 268-281. DOI： 10.11777/j.issn1000-3304.2025.25259. CSTR： 32057.14.GFZXB.2025.7514.

摘要

双向拉伸聚丙烯(BOPP)由于优异的电学、力学与光学性能，薄膜广泛应用在包装、电气与医疗等领域. 超强和超薄是塑料薄膜加工的前沿方向，但传统的一步双向拉伸工艺中，高拉伸比下分子链难以及时响应宏观应变，解缠结困难，易产生应力集中导致破膜，难以制得超强和超薄的聚丙烯薄膜. 本研究以等规聚丙烯(

PP)铸片为原料，采用同步双向拉伸技术，设计“拉伸—暂停—再拉伸”的间歇式拉伸工艺，在拉伸过程中引入松弛，通过调控间歇温度与间歇时间，控制松弛程度，研究松弛对BOPP拉伸过程、微观晶体结构及力学性能的影响. 结果表明，拉伸过程中引入松弛为分子链构象调整提供时间，有效缓解局部应力并提升最大拉伸比：存在一个最佳松弛状态，可以平衡分子链解缠结与新晶体形成的竞争. 采用该拉伸工艺可以获得高拉伸比、力学强度更高，厚度更薄的BOPP薄膜. 本研究为超强超薄高性能BOPP薄膜的制备提供新工艺新技术.

Abstract

Owing to its excellent electrical

mechanical

and optical properties

biaxially oriented polypropylene (BOPP) films are widely used in fields such as packaging

electrical engineering

and medical care. Ultra-high strength and ultra-thinness represent the cutting-edge directions in plastic film processing. However

in the traditional one-step biaxial stretching process

the molecular chains struggle to respond promptly to macroscopic strain under high stretch ratios

making it difficult for them to disentangle. This easily leads to stress concentration and subsequent film breakage

posing challenges to the preparation of ultra-high-strength and ultra-thin polypropylene films. In this study

isotactic polypropylene (

PP) castings were used as raw materials

and synchronous biaxial stretching technology was adopted. An intermittent stretching process featuring "stretching-pausing-restretching" was designed

where relaxation was introduced during the stretching process. By regulating the intermittent temperature and intermittent time

the relaxation degree was controlled

and the effects of relaxation on the stretching process

crystalline structure

and mechanical properties of BOPP were investigated. The results showed that the introduction of relaxation during the stretching process provided time for the conformational adjustment of molecular chains

effectively alleviating local stress and increasing the maximum stretch ratio. There existed an optimal relaxation state that balances the competition between molecular chain disentanglement and the formation of new crystals. Using this stretching process

BOPP films with high stretch ratios

higher mechanical strength

and thinner thickness could be obtained. This work provides a new process and technology for the prepara

tion of ultra-high-strength

ultra-thin

and high-performance BOPP films.

关键词

Keywords

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