Chain extension of polyamide-6 &amp; polyamide-6/organoclay nanocomposites :

مرکز و کتابخانه مطالعات اسلامی به زبان های اروپایی

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" Chain extension of polyamide-6 & polyamide-6/organoclay nanocomposites : "
Tuna, Basak

Document Type	:	Latin Dissertation
Record Number	:	832762
Doc. No	:	TLets732167
Main Entry	:	Tuna, Basak
Title & Author	:	Chain extension of polyamide-6 amp; polyamide-6/organoclay nanocomposites :\ Tuna, Basak
College	:	University of Bradford
Date	:	2016
student score	:	2016
Degree	:	Thesis (Ph.D.)
Abstract	:	Novel solutions to offset thermal degradation of polyamide-6 (PA-6) and organoclay (organically modified layered silicates) nanocomposites during melt compounding have been investigated. In this research, a novel chain extender (Joncryl ADR 3400) has been used to improve thermal stability of PA-6 and PA- 6/organoclay nanocomposites during melt compounding. The materials were compounded using a linear twin extruder and various laboratory scale mixers. The effects of organoclay and chain extender were studied using both processing methods. In order to replicate large scale production used in industry, a comprehensive plan of experimental work was carried out under different processing conditions (extrusion temperature and screw speed), organoclay and chain extender loading using a linear twin screw extruder. Rheology, mechanical and thermal properties were analysed and selected samples were also characterised by TEM and FTIR. Process induced degradation of PA-6 during the melt compounding was found to have significant influence on the rheological and mechanical properties. Rheological and mechanical characterisation clearly showed showed that incorporation of the chain extender minimised thermal degradation of PA-6 and nanocomposites during melt processing. Visual analysis of selected nanocomposites using TEM confirmed that chain extender increased the dispersion of nanoclays in the PA- 6 matrix. The crystallinity of the PA-6 was slightly affected by addition of organoclay and chain extender. The samples obtained by linear twin screw extrusion showed higher rheological properties than the samples from laboratory scale mixers suggesting better mixing and less thermal degradation during extrusion.
Subject	:	Nanocomposite ; Layered silicates ; Extrusion ; Polyamide-6 ; Thermal stability ; Chain extender ; Rheology
Added Entry	:	University of Bradford