Robustness Study of a Tensile Modulus Prediction Model for Semicrystalline Polymers

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Ali Zarbali, Balázs Pinke, A. Menyhárd
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引用次数: 0

Abstract

This work presents a robustness study of a previously developed empirical model that links Young's modulus to two key parameters of crystalline structure; crystallinity and lamellae thickness. The reliability of this modulus prediction model was tested by using different calorimeters and different polypropylene grades as well. Small samples were fabricated from injection-molded bars from different locations of the specimens in order to check the effect of structural inhomogeneity originated by the dynamic processing conditions. In addition, the standard deviation and consequently the accuracy of the prediction was tested by repeated calorimetric measurements. The crystalline structure and melting characteristics were measured by differential scanning calorimetry (DSC). The tensile properties of studied specimens were evaluated by standardized tensile tests. Although, the accuracy and reliability of the prediction model is dependent on the instrument used for thermal analysis, reasonably good agreement was found between the predicted and measured values in most cases. However, we may note that only well-calibrated calorimeters are suitable for reliable prediction of the modulus.
半结晶聚合物拉伸模量预测模型的鲁棒性研究
这项工作提出了先前开发的经验模型的鲁棒性研究,该模型将杨氏模量与晶体结构的两个关键参数联系起来;结晶度和薄片厚度。用不同的量热仪和不同的聚丙烯牌号测试了该模量预测模型的可靠性。为了验证动态加工条件对结构不均匀性的影响,在试件不同位置的注射成型棒材上制备了小试样。此外,通过重复量热测量来测试标准偏差和预测的准确性。用差示扫描量热法(DSC)测定了晶体结构和熔融特性。通过标准化拉伸试验评估了所研究试件的拉伸性能。虽然预测模型的准确性和可靠性取决于用于热分析的仪器,但在大多数情况下,预测值和实测值之间的一致性相当好。然而,我们可能会注意到,只有校准良好的量热计适合于模量的可靠预测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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