Effect of Segmented Distribution on Crystallized Behavior and Elastic Property of IPDI-based PU

Yu-jie Wang; Hui-fang Nie; Guo-feng Wang; Miao-ming Huang; Hao Liu; Wen-tao Liu

doi:10.11777/j.issn1000-3304.2022.22083

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Effect of Segmented Distribution on Crystallized Behavior and Elastic Property of IPDI-based PU

Research Article | 更新时间：2024-10-08

- Effect of Segmented Distribution on Crystallized Behavior and Elastic Property of IPDI-based PU
- ACTA POLYMERICA SINICA Vol. 53, Issue 11, Pages: 1379-1387(2022)
- 作者机构：
  
  1.河南工程学院化工与印染工程学院郑州 450007
  2.郑州大学材料科学与工程学院郑州 450001
  3.河南驼人医疗器械集团有限公司新乡 453400
- 作者简介：
  
  Wen-tao Liu, E-mail: wtliu@zzu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2022.22083
  CLC：
- Published：20 November 2022，
  
  Published Online：18 August 2022，
  
  Received：15 March 2022，
  
  Accepted：19 May 2022
- 稿件说明：
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王玉杰,聂慧芳,王国锋等.嵌段分布对IPDI型聚氨酯结晶行为及弹性性能的影响[J].高分子学报,2022,53(11):1379-1387.

Wang Yu-jie,Nie Hui-fang,Wang Guo-feng,et al.Effect of Segmented Distribution on Crystallized Behavior and Elastic Property of IPDI-based PU[J].ACTA POLYMERICA SINICA,2022,53(11):1379-1387.
王玉杰,聂慧芳,王国锋等.嵌段分布对IPDI型聚氨酯结晶行为及弹性性能的影响[J].高分子学报,2022,53(11):1379-1387. DOI： 10.11777/j.issn1000-3304.2022.22083.

Wang Yu-jie,Nie Hui-fang,Wang Guo-feng,et al.Effect of Segmented Distribution on Crystallized Behavior and Elastic Property of IPDI-based PU[J].ACTA POLYMERICA SINICA,2022,53(11):1379-1387. DOI： 10.11777/j.issn1000-3304.2022.22083.

摘要

嵌段分布是影响聚氨酯(PU)性能的关键因素之一，而探明嵌段分布对具有环形结构硬段PU性能的影响是开发高性能PU的关键. 在控制硬段含量相似的条件下，分别以不同分子量的聚己内酯二元醇(PCL-diol)作为软段，以异佛尔酮二异氰酸酯(IPDI)和1

4-丁二醇(BDO)为硬段，合成出一系列具有不同嵌段分布的IPDI型PU. 通过傅里叶变换红外光谱仪、超导核磁共振仪和X射线衍射仪表征不同分子量PCL-diol和不同嵌段分布IPDI型PU的化学结构. 使用偏光显微镜、3D超景深显微镜和原子力显微镜观察了IPDI型PU的结晶形态，并通过示差扫描量热仪分析其结晶行为. 此外，通过力学性能测试及样条拉伸断裂前后的形状回复探究了IPDI型PU的拉伸性能. 结果表明：IPDI型PU中仅存在软段的晶体，且随着嵌段分布的集中，即软段分子量的提高，形成的球晶尺寸增加，PU中软段的结晶能力随之提高. 不同嵌段分布的IPDI型PU具有相似的应力-应变曲线，拉伸性能相接近，但越分散的硬段其空间位阻效应越强，导致软段的取向结晶越困难，拉伸应变难以被固定，因此表现出更加优异的弹性.

Abstract

Segmented distribution is one of the key factors affecting the properties of polyurethane (PU). Exploring its effect on the properties of PU with cyclic hard segments will be the key to the successful development of high-performance and functional PU. Controlling the similarity of hard segment content

a series of IPDI-based PU with different segment distributions were synthesized using polycaprolactone diol (PCL-diol) with different molecular weights

isophorone diisocyanate (IPDI)

and 1

4-butanediol (BDO). Herein

PCL-diol with different molecular weights was used as the soft segment

and IPDI and BDO were used as the hard segment. The chemical structures of PCL-diol with different molecular weights and the IPDI-based PU with different segment distributions were characterized by Fourier transform infrared spectroscopy

superconducting nuclear magnetic resonance and X-ray diffraction. The surface morphology of IPDI-based PU was observed using a polarizing microscope

3D ultra-depth of field microscope and atomic force microscope

and its crystallization behavior was analyzed by differential scanning calorimetry. Furthermore

the tensile properties of IPDI-based PU were explored by an electronic universal testing machine and photos of the shape of stretched splines before and after fracture. The results show that only soft segment crystals exist in IPDI-based PU

and with the aggregation of the soft segment

that is

with the increase of the molecular weight of the soft segment

the size of the formed spherulites increases

and the crystallization ability of the soft segment is also enhanced. Meanwhile

IPDI-based PU with different segment distributions have similar stress-strain curves and similar tensile properties. However

the more dispersed the hard segment

the stronger the steric hindrance effect

which makes the oriented crystallization of the soft segment more difficult

the tensile strain more difficult to be fixed

and therefore

the more excellent elasticity is exhibited.

关键词

聚氨酯嵌段分布结晶行为弹性性能

Keywords

PolyurethaneSegment distributionCrystallized behaviorElastic property

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Related Institution

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