A Methodology of Hydrodynamic Complexity in Topologically Hyper‐Branched Polymers Undergoing Hierarchical Multiple Relaxations. Issue 13 (11th June 2020)

• Record Type: Journal Article
• Authors: Lu, Haibao; Wang, Xiaodong; Hossain, Mokarram; Fu, Yong Qing
• Is Part Of: Macromolecular chemistry and physics. Volume 221:Issue 13(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-06-11
• Subjects: Fox‐Flory equation -- hydrodynamic relaxations -- hyperbranched polymers -- thermodynamics; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.202000052
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract: A hydrodynamic model is proposed to describe conformational relaxation of molecules, viscoelasticity of arms, and hierarchical multiple‐shape memory effect (multi‐SME) of hyper‐branched polymer. Fox–Flory and Boltzmann's principles are employed to characterize and predict the hierarchical relaxations and their multi‐SMEs in hyper‐branched polymers. A constitutive relationship among relaxation time, molecular weight, glass transition temperature, and viscoelastic modulus is then formulated. Results reveal that molecular weight and number of arms of the topologically hyper‐branched polymers significantly influence their hydrodynamic relaxations and shape memory behaviors. The effectiveness of model is demonstrated by applying it to predict mechanical and shape recovery behaviors of hyper‐branched polymers, and the theoretical results show good agreements with the experimental ones. This study is expected to provide an effective guidance on designing multi‐SME in topologically hyper‐branched polymers. Abstract : In this study, the Fox–Flory equation is initially employed to characterize the glass transition temperature and relaxation behaviors of topologically hyper‐branched polymers. According to the Boltzmann's hydrodynamic principle, a constitutive relationship is formulated with the consideration of molecular weight, number of arms, glass transition temperature, and relaxation time.