Effect of filler loading on the mechanical properties of crosslinked 1,2,3‐triazole polymers

Abstract

The effect of filler loading on the mechanical properties of crosslinked triazole polymers obtained by polymerization of E300 dipropiolate (1) with diazide (2) obtained from tetraethylene glycol using tetraacetylene functionalized crosslinker (3) was studied systematically. Aluminum (10-14 lm) was used as the primary filler during the formulations; the effect of secondary fillers such as aluminum (<75 lm), NaCl (45-50 and 83-105 lm) was studied with the increase in the total filler loading. The modulus of the aluminum-filled crosslinked triazole polymers increases with the increase in the filler content while using either particle sized aluminum powder. The use of Al (particle size <75 lm) and NaCl (particle size 45-50 lm and 83-105 lm) as secondary or additional fillers while using aluminum (10-14 lm) as the main filler, has a diminishing effect on the modulus and strain of the crosslinked triazole polymers. Triazole polymers described herein have the ability to wet and adhere to large quantities of these inorganic salts and thus maintain mechanical properties of the composite comparable to typical polyurethane elastomeric matrices, regardless of the chemistry of the particulate filler, which imparts an important and necessary binder characteristic for energetic composites.

The investigation of reinforcement properties of nano-CaCO3 synthesized from Achatina fulica snail shell through mechanochemical methods on epoxy nanocomposites

“…These filler materials are incorporated into matrix materials to increase strength, conductivity, thermal stability, or resistance to indentation. According to Katritzky et al [5,6] and Fu et al [5,6], filler or fillers are used to improve thermal, physical, and chemical properties and enhance the bonding properties of the composite, which often result in the improvement of the mechanical properties. Even though the inclusion of fillers helps reduce the cost of polymeric matrix and binders used to produce composite materials [7][8][9][10][11], their reinforcement properties need to be validated.…”

“…Furthermore, the influence of particle sizes and the effect of reinforcement ratio of filler materials on polymer composite properties have been investigated extensively. Reports from these investigations show that the reinforcements by fillers at different particle sizes and volumes proved to have different effects on the composites, improving one property and negatively affecting another in some cases [5,20,21].…”

Isocyanate‐Free Curing of Glycidyl Azide Polymer with Bis–propargylhydroquinone

“…As reported by T. H. Hagen et al [12], we could not observe any issues such as partial precipitation, and solubility during curing of GAP with BPHQ. The mechanical properties of a composite propellant can be modified by relative ratio of curative, proportion of solid fillers and adding plasticizer in appropriate quantity [20][21][22]. The aim of choosing different ratio of GAP/BPHQ is to establish the geltime and also to achieve desired mechanical properties for various propellant applications.…”

Metal‐Free Cycloaddition of Internal Alkynes and Multifunctional Azides Under Solvent‐Free Conditions

“…[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] The classical (thermal) 1,3-dipolar cycloaddition can be performed between azides and terminal alkynes as well as internal triple bonds. Generally, the reactivity of alkynes for the click reaction is rather low due to its high electron density at the alkyne functionality.…”

“…Therefore, the development of metal‐free click‐polymerization procedures is of high interest. In the recent years, a significant effort has been devoted to the development of metal‐free click reactions . The classical (thermal) 1,3‐dipolar cycloaddition can be performed between azides and terminal alkynes as well as internal triple bonds.…”