经人工老化和自然老化的聚(1-丁烯)挤出物的降解情况

IF 2.4 3区 化学 Q3 POLYMER SCIENCE
Sona Zenzingerova, Michal Kudlacek, Lubomir Benicek, David Jaska, Jana Navratilova, Lenka Gajzlerova, Roman Cermak
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引用次数: 0

摘要

在这项工作中,我们研究了人工老化和自然风化条件下异方性聚 (1-butene) (PB-1) 的降解行为。通过紫外线照射和自然风化,PB-1 样品经历了加速老化。使用傅立叶变换红外-衰减全反射(FTIR-ATR)光谱、表面分析和广角 X 射线散射(WAXS)对降解样品的化学和结构变化进行了表征。机械性能通过拉伸测试进行评估。傅立叶变换红外-ATR 分析表明,降解样品中存在羰基,这表明样品发生了氧化降解。利用扫描电子显微镜(SEM)进行的表面观察显示,两种样品都形成了表面裂纹,裂纹的形成机制各不相同。两种老化方法都会影响样品的机械性能:人工老化会导致拉伸模量和强度逐渐降低,而自然风化则会导致模量略有增加,但强度降低。此外,在降解的初级阶段,两组样品的断裂伸长率值都明显下降。这项研究采用了加速时间当量,通过并列人工老化和自然风化过程中的羰基指数值及其内插法来确定降解速率,并充分关联老化 PB-1 的最终特性。据观察,降解样品的表面形态和机械属性受到自然风化过程中温度、湿度和降水等其他因素的影响。这项研究工作为了解 PB-1 降解机理和不同老化条件对其性能的影响提供了重要依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The degradation of poly(1-butene) extrudates subjected to artificial and natural aging

The degradation of poly(1-butene) extrudates subjected to artificial and natural aging

In this work, we examined the degradation behavior of isotactic poly(1-butene) (PB-1) under artificial aging and natural weathering conditions. PB-1 samples underwent accelerated aging through UV irradiation and natural weathering. Chemical and structural changes in the degraded samples were characterized using Fourier-transform infrared–attenuated total reflectance (FTIR–ATR) spectroscopy, surface analysis, and wide-angle X-ray scattering (WAXS). The mechanical properties were evaluated via tensile testing. FTIR–ATR analysis revealed the presence of carbonyl groups in the degraded samples, indicating oxidative degradation. Surface observations employing scanning electron microscopy (SEM) revealed the formation of surface cracks in both samples, with differing crack initiation mechanisms. The two aging methods affected the mechanical properties of the samples: artificial aging induced a gradual reduction in both tensile modulus and strength, whereas natural weathering engendered a marginal increment in modulus alongside diminished strength. Additionally, elongation-at-break value witnessed a marked decrease in both sample sets during the preliminary stages of degradation. This work employed accelerated time equivalent, obtained by juxtaposition of the values of carbonyl index during both artificial aging and natural weathering and their interpolation to determine the degradation rate and adequately to correlate the final properties of the aged PB-1. It was observed that surface morphology and mechanical attributes of degraded samples were subject to additional influences such as temperature, humidity, and precipitation during natural weathering. This research work provided significant insights into PB-1 degradation mechanisms and effect of different aging conditions on its performance.

Graphical abstract

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来源期刊
Iranian Polymer Journal
Iranian Polymer Journal 化学-高分子科学
CiteScore
4.90
自引率
9.70%
发文量
107
审稿时长
2.8 months
期刊介绍: Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.
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