Hydroxyl terminated poly(dimethylsiloxane)crosslinked by expanded vermiculite and its flame retardant performance optimization
GUO Dong-jie
WANG Yan-hui
BAI Bao-feng
YAN Chun-mian
SHI Bo
FANG Shao-ming
Abstract：Expanded vermiculite (EV)doped poly(dimethylsiloxane)(PDMS)(EV-PDMS)was prepared through two steps of condensation reactions,in which hydroxyl terminated poly(dimethylsiloxane)was as main part,high temperature EV was as additive,and tetraethoxy-silicane (TEOS)was as coupling agent.And the flame reatardant performance of EV-PDMS was studied.Detections of attenuated total reflectance infrared spec-trum (ATR-IR),water contact angle,and scanning electron microscope (SEM)revealed that,EV flakes homo-geneously dispersed into PDMS,and crosslinked with PDMS through Si—O—Si covalent bonds;the resultant EV-PDMS elastomer maintained a highly hydrophobic surface.Mechanical properties revealed that,after addi-tion of 60 copies EV,tensile strengths,Young’s moduli,and Shao’s hardness respectively increase to 4.50, 1.97 and 2.17.Combustion tests revealed that,after addition of 5 copies of decabromodiphenyl oxide (DeDBE)and 5 copies of aluminum hydroxide,flame retardant properties of EV-PDMS reached to FV-0 class, and their limited oxygen indexes (LOI)reached to 69.5%.
Keywords：expanded vermiculiteHydroxyl terminated poly(dimethylsiloxane )condensation reactionflame retardant perfor-mance
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 21-28 )