Rheological and mechanical properties of polystyrene with hydrogen bonding

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Abstract

Recent work [1] shows that polystyrene can become flexible at room temperature by stretching the melt at a rate faster than the inverse Rouse time, followed by rapid quenching below the glass transition temperature (Tg). Long-lasting flexibility and good humidity resistance, combined with other advantages such as light weight and interference immunity, make this flexible polystyrene a good candidate for plastic optical fibers (POFs). However, improvements are required to prevent cracks during filament bending.
In the present work, we investigate if crack prevention can be achieved by introducing hydrogen bonding (carboxylic acid groups) into the backbone. The rheological and mechanical properties of polystyrenes with different acid group contents are studied and compared to the corresponding pure polystyrene sample. Linear viscoelastic (LVE) measurements have experimentally confirmed that all the tested samples have a similar number of entanglements per chain (Z), suggesting that the acid groups do not form (or weakly form) hydrogen bonds at temperatures above Tg. This is further confirmed by non-linear extensional behavior measured by stretching the samples in uniaxial extensional flow. However, different mechanical properties at room temperature have been observed, which may be explained by the Haward and Thackray model.[2] The polystyrene fibers are also compared with poly(methyl methacrylate) (PMMA, the most used core material for POFs) to show the potential of polystyrene as plastic optica, special fibers.
Original languageEnglish
Publication date2019
Publication statusPublished - 2019
EventAnnual European Rheology Conference 2019 - Portoroz, Slovenia
Duration: 8 Apr 201911 Apr 2019
https://rheology-esr.org/aercs/aerc-2019/welcome/

Conference

ConferenceAnnual European Rheology Conference 2019
LocationPortoroz
CountrySlovenia
Period08/04/201911/04/2019
Internet address

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