熔融聚合物挤出膨胀的最新技术：从分子尺度的基本理解到最终产品尺度的最佳模具设计,Macromolecular Materials and Engineering

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熔融聚合物挤出膨胀的最新技术：从分子尺度的基本理解到最终产品尺度的最佳模具设计
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-08-23 , DOI: 10.1002/mame.202000340
Dahang Tang ₁ , Flavio H. Marchesini ₁ , Ludwig Cardon ₁ , Dagmar R. D'hooge _{2,

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Affiliation

聚合物挤出物溶胀是一种流变现象，在聚合物熔体流出挤出设备的模具出口后，由于流动重新分布和分子应力松弛而发生。相关的模具设计基于抑制或补偿模具出口下游膨胀行为的策略。这一贡献全面突出了当前的知识和大量的实验和建模工具，用于调整聚合物熔体的挤出物膨胀。新颖之处在于综合考虑 i) 加工参数、ii) 模具几何形状、iii) 大分子特性（例如，摩尔质量分布和支化水平）和 iv) 加性宏观特性的影响和相互作用。此外，比较了通过半经验表达式和基本粘弹性本构模型对各种流动几何形状中挤出物膨胀的预测。特别关注微分 Phan-Thien-Tanner (PTT)、基于分子的双对流 POM-POM 模型 (DCPP) 和积分 Kaye-Bernstein-Kearsley-Zapas (K-BKZ) 模型及其在3D 溶胀描述，指示了解分子参数和粘弹性基本关系的最佳模型。通过包括解决最终产品规模设计的案例研究，也说明了这种详细分析的相关性。以及完整的 Kaye-Bernstein-Kearsley-Zapas (K-BKZ) 模型及其对 3D 膨胀描述的有用性，表明了了解分子参数和粘弹性基本关系的最佳模型。通过包括解决最终产品规模设计的案例研究，也说明了这种详细分析的相关性。以及完整的 Kaye-Bernstein-Kearsley-Zapas (K-BKZ) 模型及其对 3D 膨胀描述的有用性，表明了了解分子参数和粘弹性基本关系的最佳模型。通过包括解决最终产品规模设计的案例研究，也说明了这种详细分析的相关性。

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State of the‐Art for Extrudate Swell of Molten Polymers: From Fundamental Understanding at Molecular Scale toward Optimal Die Design at Final Product Scale

Polymer extrudate swell is a rheological phenomenon taking place after polymer melt flow emerges the die exit of extrusion equipment, due to flow redistributions and molecular stress relaxations. The associated die design is based on the strategy of inhibiting or compensating the swelling behavior downstream the die exit. This contribution comprehensively highlights the current knowledge and plethora of experimental and modeling tools to tune extrudate swell of polymer melts. The novelty lies in the combined consideration of the impact and interplay of i) the processing parameters, ii) the die geometry, iii) the macromolecular characteristics (e.g., molar mass distribution and branching level), and iv) the additive macroscopic properties. Furthermore, the prediction of extrudate swell through various flow geometries by semiempirical expressions and fundamental viscoelastic constitutive models is compared. Specific focus is on the differential Phan-Thien-Tanner (PTT), the molecular-based Double-Convected POM-POM model (DCPP), and the integral Kaye-Bernstein-Kearsley-Zapas (K-BKZ) model and their usefulness for 3D swelling descriptions, indicating the optimum model to understand the fundamental relation of molecular parameters and viscoelasticity. The relevance of such detailed analysis is also illustrated by including case studies addressing design at the final product scale.

更新日期：2020-08-23

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