Modeling of aging behavior for PVC plastisols containing a recycled fraction

IF 2.3 3区工程技术 Q2 MECHANICS

Rheologica Acta Pub Date : 2025-01-07 DOI:10.1007/s00397-024-01480-w

P. Fajardie, C. Carrot, P. Cassagnau

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Abstract

A rheological model was developed to predict the aging behavior, i.e., the increase of viscosity over time, for plastisols containing a fraction of plasticized processed PVC. The model is valid for low-concentration plastisols, composed of a bimodal virgin resin and a monomodal processed PVC powder which is initially plasticized with at least 33 wt% of diisononyl phthalate (DINP). The swelling rate was determined for individual spherical particles of each type and accounts for variations of the transfer surface during diffusion of DINP. The viscosity of this multimodal suspension was subsequently determined according to the Farris approach (Trans Soc Rheol 12:281–301, 1968). Predictions of the model are congruent with experimental data and a subsequent variational study aimed at completing these observations by investigating the effects of parameters that cannot be varied experimentally. Results demonstrate that the aging phenomenon depends on several factors such as amount and initial plasticizer concentration of processed PVC but also initial radius and size distribution as well as shape and deformability of particles. Limitations of the model are also discussed.

Graphical abstract

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含回收组分PVC塑料溶胶的老化行为建模

一个流变模型被开发来预测老化行为，即粘度随时间的增加，为塑料溶胶含有部分塑化加工PVC。该模型适用于低浓度的塑料溶胶，由双峰原始树脂和单峰加工PVC粉末组成，该粉末最初用至少33 wt%的邻苯二甲酸二异壬酯（DINP）增塑化。确定了每种类型的单个球形颗粒的膨胀率，并解释了DINP扩散过程中传递表面的变化。这种多模态悬架的粘度随后根据Farris方法测定（Trans Soc Rheol 12:281-301, 1968）。该模型的预测与实验数据一致，随后的变分研究旨在通过调查实验不能改变的参数的影响来完成这些观察结果。结果表明，PVC的老化现象不仅与塑化剂的用量和初始浓度有关，还与塑化剂的初始半径和粒径分布以及塑化剂颗粒的形状和变形能力有关。本文还讨论了模型的局限性。图形抽象

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来源期刊

Rheologica Acta 物理-力学

CiteScore

4.60

自引率

8.70%

发文量

审稿时长

3 months

期刊介绍： "Rheologica Acta is the official journal of The European Society of Rheology. The aim of the journal is to advance the science of rheology, by publishing high quality peer reviewed articles, invited reviews and peer reviewed short communications. The Scope of Rheologica Acta includes: - Advances in rheometrical and rheo-physical techniques, rheo-optics, microrheology - Rheology of soft matter systems, including polymer melts and solutions, colloidal dispersions, cement, ceramics, glasses, gels, emulsions, surfactant systems, liquid crystals, biomaterials and food. - Rheology of Solids, chemo-rheology - Electro and magnetorheology - Theory of rheology - Non-Newtonian fluid mechanics, complex fluids in microfluidic devices and flow instabilities - Interfacial rheology Rheologica Acta aims to publish papers which represent a substantial advance in the field, mere data reports or incremental work will not be considered. Priority will be given to papers that are methodological in nature and are beneficial to a wide range of material classes. It should also be noted that the list of topics given above is meant to be representative, not exhaustive. The editors welcome feedback on the journal and suggestions for reviews and comments."