Enhancement of the thermal stability of PVC filled with multiwalled carbon nanotubes using new antimicrobic itaconimido aryl 1,3,4‐oxadiazoles

Abstract

A series of PVC films stabilized with novel antimicrobial itaconimido aryl 1,3,4-oxadiazoles (D1'-D4'), at absence or presence of various concentrations of multiwalled carbon nanotubes (MWCNTs), was prepared by a conventional solution casting method. D1'-D4' was prepared via thermal cyclization processes by loss of water for their congruous predecessors itaconimido aryl hydrazides. Elemental analysis and various spectroscopy measurements were used to prove their structures. D1'-D4' have great antimicrobial activities and some of them showed similar or sometimes higher impact than the reference antibiotic. From TG measurements in nitrogen, they have high thermal stabilities and their decomposition temperatures were above 275-310 C in accordance with substituent groups NH 2 and/or OH incorporated into their structures. They have higher thermal stabilizing efficiencies for PVC in comparison with some industrial thermal stabilizers. Inclusion of 0.1-0.5 wt% MWCNTs into PVC films, that were stabilized with D4', enhanced the composites thermal stability. XRD, SEM as well as TEM were used for ascertaining of incorporation and well dispersion of MWCNTs into PVC matrices. Additionally, the efficacy of stabilization has been proven via a decreased rate of color alteration, mechanical properties change and chains cleavage for PVC. The high antimicrobial and thermal characteristics of these stabilizers afford them a great possibility to secure antimicrobial thermally stable PVC composites. Also, improvement of thermal and mechanical properties of PVC stabilized by D4' after its incorporation with MWCNTs afford a great possibility to its application in different fields where their thermal resistance and high tensile strength resistance play a very important role.

Synthesis of Co(ll), Ni(ll), Cu(ll), Pd(ll), and Pt(lV) Complexes with 1⁴,1⁵,3⁴,3⁵-Tetrahydro-1¹<i>H</i>, 3¹<i>H</i>-4,8-diaza-1,3(3,4)-ditriazola-2,6(1,4)-dibenzenacyclooctaphane-4,7-dien-1⁵,3⁵-dithione, and the Thermal Stability of Polyvinyl Chloride Modified Complexes

“…Because of the effects of photostabilization and photo degradation [22], the following procedure might lead to energy transmission in polymers that is highly ineffective. The energy is transferred between molecules of a photo-stabilizer (acceptor) [23] and a stimulating polymer molecule (donor) [24]. Intra molecular [23] energy exchange happens between the molecules of a polymer (acceptor) and another chromophore (donor).…”

Trends and prospects for thermal stabilizers in polyvinyl chloride

“…Furthermore, PVC under this formula shows very high inhibition efficiency against S. aureus and E. coli. Al-Harby et al [52] also investigated the synergistic effect between itaconimido aryl 1,3,4-oxadiazoles (D1 0 -D4 0 ) and MWCNTs on PVC's thermal stability and antibacterial properties. The inclusion of 0.1-0.5 wt% MWCNTs into PVC films, that were stabilized with D4 0 , enhanced the composites' thermal stability and mechanical properties of PVC.…”

Effect of Single-Walled Carbon Nanotubes on the Adsorption of Basic Red 12 Dye by Trimellitic Anhydride Isothiocyanate-Cross Linked Chitosan Hydrogel

“…The orderly structure and crystalline pattern of SWCNTs are represented by two specific peaks at diffraction angles of 26.8 o (intensive) and 46.5 o (very weak) [43,44], whilst H1 is completely amorphous (Fig. 2b).…”