Abstract
AbstractExpanded vermiculite (EV) was introduced into rigid polyurethane (RPU) foam. The incorporation of 10 wt% EV into RPU foam increases the compressive strength and the flexural strength by 82% and by 115%, respectively compared with untreated RPU foam. The LOI of RPU foam containing 20 wt% EV is only 19.5%. To further improve the flame retardancy of RPU/EV composite foam, melamine phenylphosphate (MPP) was synthesized and introduced into the RPU/EV composite foam. The RPU/EV composite foam with 15% MPP (sample RPU/EV/MPP15) has a LOI of 27.5% and a V0 rating in the vertical UL-94 test. The PHRR and THR of sample RPU/EV/MPP15 decrease by 39% and 24%, respectively, compared with the ones of untreated RPU/EV composite foam. The compressive strength and flexural strength of RPU/EV/MPP composite foam gradually decrease with the increase in the amount of MPP. TGA results indicated that the addition of MPP further increase the residue char of the RPU/EV composite foam.
Highlights
The compressive strength and flexural strength of Rigid polyurethane (RPU) composite foam reach a maximum at about 10 % Expanded vermiculite (EV), an 82% and 115% increase, respectively relative to the one of untreated RPU foam
It was found that the incorporation of 10 wt% EV into rigid polyurethane (RPU) foam results in 82% and 115% enhancement in compressive strength and flexural strength, respectively
Cone calorimeter results show that the peak heat release rate (PHRR) and the total heat release (THR) of RPU/EV15 decrease by 36% and by 38%, respectively compared with the ones of untreated RPU foam the Limiting oxygen index (LOI) of the foam is only 19.5%
Summary
By [13, Lemma 1.3]foeaamchs aesigweenlsl.pAalctheooufgAh,EAG∗ishaans edfifmicieennstifolanmoenree.taLredta{nθt i}di= denote an. Rigid polyurethane (RPU) foams thermal insulating materials in and construction because of its theaxerceeflitwivAlwesheal∗hniedald.uetneLsneoltemtyseafhtvenoe{uecbdfθhorsuaieAariA}rlddnd.ddi∗=eiiFcnroaaaoigsdrclnrdtegsenro{fctctoohyiooθn≤ntprennedgetst−iRhCafaiifooPdo}eil≤snfaaUemditb=mmitradnhapafnsegbeoasildsrliaref(eeselea1mtaaitd2{rgamldv)sdsvre.,eiwdeoinot}Idtaerinvrhsditenred=hateitntaoaealsunrodrripiiandnietddnontecasiilaaogRtoynaironrnmPotdopfsnUθif,eoArao,itrarrfr-fh∗aeoenpeftedamioh(daigmosueaoleeesnnmicsscognepoih(sebovwh[1a,fnf7el3ounie,cv-dirE1inrtPuatec5tGoroalhl)sriyur.roldeguauepfirapsonassonuorergdoosairdocpifAdltnnlaeAiye.tiodrahtr.TtrdnlilieToenheifrgtdh8sagmeiev.se7niotaeohnso]-f-lr)isAdo. tne,ar.AniInd∗fgatihsr{desθ.eoiSl}rfid-dim=de. Wang: Rigid polyurethane/expanded vermiculite/melamine phenylphosphate for thermal insulating applications. The expanded polystyrene (EPS) particles and concrete composite foams have been used in the sector of building and construction. The EPS particles are difficultly dispersed evenly in the concrete because of their extreme low density and hydrophobic nature [16]. To solve the problems mentioned above, the surfacial modification of the EPS particles is usually needed to increase their compatibility with the concrete. Mechanical strengths and flame retardancy of RPU foams containing EV were studied. The effect of the ratios of MPP and EV on mechanical strengths, flame retardancy, and thermal stability was investigated
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