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Influence of non-covalent modification of multiwalled carbon nanotubes on the crystallization behaviour of binary blends of polypropylene and polyamide 6

DSpace at IIT Bombay

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Title Influence of non-covalent modification of multiwalled carbon nanotubes on the crystallization behaviour of binary blends of polypropylene and polyamide 6
 
Creator MUKHOPADHYAY, N
PANWAR, AS
KUMAR, G
SAMAJDAR, I
BHATTACHARYYA, AR
 
Subject ACRYLONITRILE-BUTADIENE-STYRENE
CO-CONTINUOUS BLENDS
ISOTACTIC POLYPROPYLENE
MECHANICAL-PROPERTIES
BETA-MODIFICATION
FRACTIONATED CRYSTALLIZATION
RHEOLOGICAL PROPERTIES
COMPATIBILIZED BLENDS
MELTING BEHAVIOR
POLYMER BLENDS
 
Description Blends of polypropylene (PP) and polyamide 6 (PA6) with multiwalled carbon nanotubes (MWNTs) were prepared using different processing strategies in a twin-screw micro-compounder. The effect of MWNTs on the crystallization behaviour of the PP phase and the PA6 phase of the blend has been investigated through non-isothermal crystallization studies by differential scanning calorimetric analysis. Furthermore, the effect of the addition of the compatibilizer (PP-g-MA) and the modification of MWNTs (m-MWNTs) with a non-covalent organic modifier (Li-salt of 6 amino hexanoic acid, Li-AHA) has also been studied in context to the crystallization behaviour of the PP and PA6 phase in the blend. The crystallization studies have indicated a significant increase in bulk crystallization temperature of the PP phase in the blend in the presence of MWNTs. Moreover, the formation of 'trans-lamellar crystalline' structure consisting of PA6 'trans-crystalline lamellae' on MWNTs surface was facilitated in the case of blends prepared via 'protocol 2' as compared to the corresponding blends prepared via 'protocol 1'. Wide angle X-ray diffraction analysis has showed the existence of a beta-polymorph of the PP phase due to incorporation of the PA6 phase in the blend. Addition of MWNTs in the blends has facilitated further beta-crystalline structure formation of the PP phase. In the presence of m-MWNTs, a higher beta-fraction was observed in the PP phase as compared to the blend with pristine MWNTs. Addition of PP-g-MA has suppressed the beta-phase formation in the PP phase in the blend. X-ray bulk texture analysis revealed that incorporation of PA6 as well as pristine/modified MWNTs has influenced the extent of orientation of the PP chains towards specific crystalline planes in various blend compositions of PP and PA6.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2016-01-15T06:45:59Z
2016-01-15T06:45:59Z
2015
 
Type Article
 
Identifier PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17(6)4293-4310
1463-9076
1463-9084
http://dx.doi.org/10.1039/c4cp05060f
http://dspace.library.iitb.ac.in/jspui/handle/100/17967
 
Language en