Related Experiment Video
Updated: Sep 24, 2025

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
Published on: February 6, 2016
Improving the curing and flame retardancy of epoxy resin composites by multifunctional Si-containing cyclophosphazene
Wang-Xi Fan1, Zefang Li2, Zhou Yang1
1School of Materials Engineering, Jiangsu University of Technology Changzhou China.
Abstract:
Novel star-like molecules containing P, N and Si with dual functions of flame retardance and curing promotion (abridged as HCCP-KH540) were successfully synthesized through the nucleophilic substitution reaction of hexachlorocyclotriphosphazene (HCCP) and 3-aminopropyltrimethoxysilane (KH540). HCCP-KH540 was incorporated with the matrix of epoxy resin (EP) to form a flame retardant composite abridged as E-HK. The activation energy of the curing reaction of the E-HK composite was reduced but the curing reaction rate was accelerated by HCCP-KH540. The E-HK composite with 30 phr content of HCCP-KH540 exhibited excellent flame retardancy with limiting oxygen index of 29.6% and V-1 rating in the vertical burning test as well as excellent thermal stability with a char yield of 23.77% at 700 °C, compared with only 8.64% for pure EP.
Related Concept Videos
Cycloaddition Reactions: Overview
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
Structure and Nomenclature of Epoxides
Stability of Substituted Cyclohexanes
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
Cycloaddition Reactions: MO Requirements for Thermal Activation

