Creep lifetime of ethylene vinyl acetate co-polymer film after pre-load relaxation

IF 3.1 3区化学 Q2 POLYMER SCIENCE

Polymer Bulletin Pub Date : 2024-11-25 DOI:10.1007/s00289-024-05567-5

Victor Kislyuk, Vladyslav Shyvaniuk, Sergiy Kotrechko

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Abstract

The influence of the mechanical load and ultraviolet radiation on the lifetime of viscous and elastic ethylene vinyl acetate co-polymer (EVA) films under the various loads are studied to establish its principles and to develop the basic concepts regarding its physical nature. The dumbbell samples of the cured (annealed at 135 °C) EVA films (c-EVA) are pre-loaded and kept pre-strained till the complete load relaxation to reduce a viscous component prior to the creep under the load added to the relaxed value of the external force. The creep lifetime logarithm vs. added load dependencies measured at 21 °C with and without simultaneous ultraviolet irradiation with 365 nm wavelength light (from the EVA absorption tail) contain two linear segments each. The linear fragments are approximated with Zhurkov and Kauzmann–Eyring (KE) phenomenological models, which allows one to derive the quantitative parameters such as activation energy (found to be by several times lower than the dissociation energy of C – C bond), structural factor and force concentration factor as well as to estimate the density of the aligned polymer chains (per unit area) and the alignment level defined as the ratio of the polymer chain density to its maximal value (estimated to be \(4\cdot {10}^{18} {\text{m}}^{-2})\). The specific surface energy of the order of 0.01 J m⁻² calculated from the KE approximation data is in a proper consent with Griffith’s criterion for the crack propagation.

Graphical abstract

Abstract Image

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预载松弛后乙烯醋酸乙烯共聚物薄膜的蠕变寿命

研究了机械载荷和紫外线辐射对粘性和弹性EVA膜在不同载荷下寿命的影响，建立了EVA膜的工作原理，提出了EVA膜物理性质的基本概念。对固化（135℃退火）EVA薄膜（C -EVA）的哑铃样进行预加载并保持预应变，直到载荷完全松弛，以减少在载荷下蠕变之前的粘性成分，增加外力的松弛值。蠕变寿命对数与在21°C下测量的附加负载依赖关系，在365 nm波长的光（来自EVA吸收尾）的同时进行紫外照射时，分别包含两个线性段。线性片段用Zhurkov和Kauzmann-Eyring （KE）现象学模型进行近似，从而可以推导出定量参数，如活化能（发现比C - C键的解离能低几倍）；结构因子和力集中因子，以及估计排列的聚合物链的密度（单位面积）和排列水平定义为聚合物链密度与其最大值的比值（估计为\(4\cdot {10}^{18} {\text{m}}^{-2})\)）。由KE近似数据计算得到的0.01 J m−2量级的比表面能与裂纹扩展的Griffith准则基本一致。图形摘要

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来源期刊

Polymer Bulletin 化学-高分子科学

CiteScore

6.00

自引率

6.20%

发文量

审稿时长

5.5 months

期刊介绍： "Polymer Bulletin" is a comprehensive academic journal on polymer science founded in 1988. It was founded under the initiative of the late Mr. Wang Baoren, a famous Chinese chemist and educator. This journal is co-sponsored by the Chinese Chemical Society, the Institute of Chemistry, and the Chinese Academy of Sciences and is supervised by the China Association for Science and Technology. It is a core journal and is publicly distributed at home and abroad. "Polymer Bulletin" is a monthly magazine with multiple columns, including a project application guide, outlook, review, research papers, highlight reviews, polymer education and teaching, information sharing, interviews, polymer science popularization, etc. The journal is included in the CSCD Chinese Science Citation Database. It serves as the source journal for Chinese scientific and technological paper statistics and the source journal of Peking University's "Overview of Chinese Core Journals."