Thermal and mechanical properties of polyamide 6/poly(vinyl alcohol) blends with and without peroxides
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Thermal and mechanical properties of polyamide 6/ poly(vinyl alcohol) blends with and without peroxides K. G. Pradeepa1 · G. M. Shashidhara1 · G. M. Chandrika1 Received: 4 September 2018 / Accepted: 31 October 2019 © Central Institute of Plastics Engineering & Technology 2019
Abstract Polyamide 6 (PA6)/polyvinyl alcohol (PVOH) blends of different compositions (90/10, 80/20, 70/30, 60/40) were prepared using Haake rheomixer. The selected blend compositions (80/20 and 60/40) were modified with peroxides (dicumyl peroxide—DCP and tertiary butyl cumyl peroxide—TBCP). The thermal and mechanical properties of the blends were studied. The thermal stability of blends is found to be intermediate to that of PA6 and PVOH. There is no significant change in thermal stability with the addition of peroxides. The FTIR studies proved good interaction between the components in blend systems. The DSC measurements showed reduction in crystallinity of PA6 with the addition of PVOH. The crystallinity further reduced with the addition of peroxides to the blends, due to the formation of crosslink network. The MFI values decreased with the addition of PVOH and peroxides. The PA6/PVOH blends showed poor mechanical properties, whereas the properties were improved with the addition of peroxides to PA6/PVOH blends. Keywords Blends · Polyamides · Differential scanning calorimetry (DSC) · Thermogravimetric analysis (TGA) · Crystallization
Introduction The polymer blending technology has been the subject of intense research in both academic and industrial aspects. Forming blends from two or more polymers serves as a relatively inexpensive and facile method of achieving desired mechanical, physical and thermal properties compared to developing new monomers or exploiting alternative polymerization mechanisms and kinetics. The polymer blends can yield additive or even synergistic property improvements compared to their neat components. * K. G. Pradeepa [email protected] 1
Department of Polymer Science and Technology, Sri Jayachamarajendra College of Engineering, JSS Science and Technology University, JSSTI Campus, Mysore 570006, India
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International Journal of Plastics Technology
Polyamides are widely used for several industrial applications because of its high tensile properties, good chemical and abrasion resistance and good processibility. One of the major limitations of polyamide is its significant brittleness under impact loading at low temperature. [1]. PVOH is transparent, flexible, low-cost polymer known for its biodegradable and gas barrier properties. Because of its poor thermal stability and hygroscopic nature, PVOH cannot be used as a thermoplastic. However, it can be used as a blend component of polymer blend. Polyvinyl alcohol and its blends are used in several applications such as in biomedical devices because of its biocompatibility, non-toxicity, non-carcinogenic, swelling properties and bioadhesive characteristics [2] and also as polymer electrolyte membrane for fuel cells [3]. The property m
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