常温下非晶态聚乙烯内聚能密度的测定及其应用

徐涛; 傅智盛; 李寒莹

doi:10.14028/j.cnki.1003-3726.2024.23.126

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常温下非晶态聚乙烯内聚能密度的测定及其应用

教学 | 更新时间：2024-01-25

- 常温下非晶态聚乙烯内聚能密度的测定及其应用
- Determination and Application of the Cohesive Energy Density of Amorphous Polyethylene at Room Temperature
- 高分子通报 2024年37卷第2期页码：263-269
- 作者机构：
  
  1..高分子合成与功能构造教育部重点实验室，山西浙大新材料与化工研究院，高分子科学与工程学系，浙江大学，杭州 310058
  2..杭州星庐科技有限公司，杭州 310012
  3..浙江大学-星庐科技高端聚烯烃联合研发中心，浙江大学，杭州 310058
  4..浙江大学高分子新物质创制国际研究中心，杭州 310058
- 作者简介：
  
  *傅智盛，E-mail: fuzs@zju.edu.cn；李寒莹，E-mail: hanying_li@zju.edu.cn
  *傅智盛，E-mail: fuzs@zju.edu.cn；李寒莹，E-mail: hanying_li@zju.edu.cn
- 基金信息：
  
  山西浙大新材料与化工研究院成果转化项目(2021SZ-AT001)
- DOI：10.14028/j.cnki.1003-3726.2024.23.126
  中图分类号：
- 纸质出版日期：2024-02-20，
  
  收稿日期：2023-04-06，
  
  录用日期：2023-05-18
- 稿件说明：
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引用：徐涛, 傅智盛, 李寒莹. 常温下非晶态聚乙烯内聚能密度的测定及其应用. 高分子通报, 2024, 37(2), 263–269

Citation: Xu, T.; Fu, Z. S.; Li, H. Y. Determination and application of the cohesive energy density of amorphous polyethylene at room temperature. Polym. Bull. (in Chinese), 2024, 37(2), 263–269
引用：徐涛, 傅智盛, 李寒莹. 常温下非晶态聚乙烯内聚能密度的测定及其应用. 高分子通报, 2024, 37(2), 263–269 DOI： 10.14028/j.cnki.1003-3726.2024.23.126.

Citation: Xu, T.; Fu, Z. S.; Li, H. Y. Determination and application of the cohesive energy density of amorphous polyethylene at room temperature. Polym. Bull. (in Chinese), 2024, 37(2), 263–269 DOI： 10.14028/j.cnki.1003-3726.2024.23.126.

摘要

内聚能密度描述了分子间作用力的大小，是高分子物理中最基础的概念之一。高聚物的物理性质很多都与内聚能密度密切相关。在高分子物理本科教学中，聚乙烯通常被描述为“用内聚能密度大小判断材料宏观用途”的唯一例外。该特例出现被归因为聚乙烯的结晶性，而验证聚乙烯是否是例外的难题是无法得到常温下的非晶态聚乙烯。本文采用了一种

-二亚胺镍催化剂(NiB)催化乙烯加压聚合成功合成了常温下非晶态聚乙烯(重均分子量为2.01×10

g/mol，分子量分布为1.80，支化度为107个支链/1000个碳，玻璃化转变温度为−63.1 ℃，密度为0.856 g/cm

)。采用最大特性黏度法测得聚乙烯的内聚能密度为259 J/cm

，与基团贡献法估算的数值十分接近；常温下，该非晶态聚乙烯宏观表现为橡胶态，符合橡胶态特性的普适规律。结果表明，非晶态聚乙烯的内聚能密度(

300 J/cm

)及其宏观表现(橡胶态)之间的关联并非例外，而是符合教科书上“用内聚能密度大小判断材料宏观用途”的一般规律。

Abstract

The cohesion energy density describes the magnitude of intermolecular forces

which is one of the most fundamental concepts in polymer physics. The physical properties of polymers are closely related to the cohesion energy density. In undergraduate polymer physics teaching

polyethylene

due to its high crystallinity

was often described as the only exceptional case of the rule that "the density of cohesion energy is used to determine the macroscopic use of the material". It is highly desired to prepare completely amorphous polyethylene at room temperature. In this paper

-diimine nickel catalyst (NiB) was used to catalyze the pressurized polymerization of ethylene to successfully synthesize amorphous polyethylene (

: 2.01×10

g/mol

PDI: 1.80

Branches: 107/1000C

: −63.1 ℃

: 0.856 g/cm

) at room temperature. The maximum characteristic viscosity method was used to measure the cohesive energy density of polyethylene as 259 J/cm

which was very close to the value estimated by the group contribution method. The amorphous polyethylene exhibited a rubbery macroscopic behavior at room temperature. As a result

the correlation between the measured cohesion energy density (

300 J/cm

) and the rubbery macroscopic behavior is not exceptional but follow the general rule.

关键词

高分子物理内聚能密度非晶态聚乙烯

Keywords

Polymer physicsCohesion energy densityAmorphous polyethylene

references

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