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Transparent PC/PMMA Blends Via Reactive Compatibilization in a Twin-Screw Extruder

Title data

Bubmann, Tobias ; Seidel, Andreas ; Altstädt, Volker:
Transparent PC/PMMA Blends Via Reactive Compatibilization in a Twin-Screw Extruder.
In: Polymers. Vol. 11 (December 2019) Issue 12 . - No. 2070.
ISSN 2073-4360
DOI: https://doi.org/10.3390/polym11122070

Official URL: Volltext

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Abstract in another language

The effect of different catalysts on reactive compatibilization of 50/50 polycarbonate (PC)/polymethylmethacrylate (PMMA) blends achieved via transesterification that occurs during compounding in a twin-screw extruder was investigated on a phenomenological (optical and mechanical properties), mesoscopic (phase morphology), and molecular level (PC-graft(g)-PMMA-copolymer formation and polymer molecular weight degradation). Formation of PC-(g)-PMMA-copolymer by transesterification resulting in transparent mono-phase PC/PMMA blends with obviously improved compatibility of the two polymer constituents requires use of a suitable catalyst. As a side-effect, PC-(g)-PMMA-copolymer formation by transesterification is always accompanied by a significant simultaneous decomposition of the molecular weight (Mw) of the PC. For the first time, a colorless, transparent (mono-phase) PC/PMMA 50/50 blend was achieved by a twin-screw extrusion process that can be easily transferred into industrial scale. To achieve this milestone, 0.05 wt% of a weakly acidic phosphonium salt catalyst had to be applied. As a result of the decrease in Mw of the PC, the mechanical properties (e.g., tensile strain at break and impact strength) of the obtained blends were significantly deteriorated rather than improved as targeted by the polymer compatibilization; therefore, the produced transparent PC/PMMA blends are considered not yet technically suitable for any industrial applications. Different manufacturing process strategies that do not inherently result in PC degradation as a side effect of PC-graft(g)-PMMA-copolymer formation have to be developed to potentially achieve transparent PC/PMMA blends with a useful balance of properties. Based on the experimental observations of this study, a new mechanism of the transesterification reaction occurring during reactive compounding of PC and PMMA in the presence of the effective catalysts is proposed.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: Special Issue: Eurofillers Polymer Blends
Keywords: transparency; PC; PMMA; blend; transesterification; PC-graft-PMMA copolymer; reactive compounding; continuous reactive extrusion; compatibilization
Institutions of the University: Faculties > Faculty of Engineering Science > Former Professors > Chair Polymer Materials - Univ.-Prof. Dr.-Ing. Volker Altstädt
Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Polymer Materials
Faculties > Faculty of Engineering Science > Former Professors
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 20 Oct 2020 11:04
Last Modified: 06 Apr 2021 09:24
URI: https://eref.uni-bayreuth.de/id/eprint/58580