TY - JOUR
T1 - Effect of montmorillonite type on mechanical and flame retarded properties of Al(OH)3/ethylene vinyl acetate copolymer composites
AU - Cheng, Bo
AU - Li, Dinghua
AU - Wu, Fan
AU - Qin, Zhaolu
AU - Yang, Rongjie
N1 - Publisher Copyright:
© 2017,Chinese Society for Composite Materials. All right reserved.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - Montmorillonite containing Ca2+ (Ca-MMT) and montmorillonite modified with organic group (Na-MMT) were used in flame retardant ethylene vinyl acetate copolymer (EVA) with Al(OH)3, respectively. The effect of Ca-MMT was investigated on mechanical, thermal and flammability properties of Al(OH)3/EVA composites, compared with Na-MMT. MMT-Al(OH)3/EVA composites were processed by melt blending in a twin-screw extrude. XRD and TEM show that MMT achieves exfoliation in MMT-Al(OH)3/EVA composites and the exfoliated layer of Ca-MMT is relatively smaller than Na-MMT. Ca-MMT-Al(OH)3/EVA shows better tensile strength and thermal stability than Na-MMT-Al(OH)3/EVA. In Cone calorimeter test, Ca-MMT-Al(OH)3/EVA also performs better than Na-MMT-Al(OH)3/EVA with lower heat release. Moreover, the condensed phase of Ca-MMT-Al(OH)3/EVA exhibits higher thermal insulation through lower and flatter back-temperature curves of CONE, corresponding to the compact and intact residue char surface after CONE. All the evidences indicate that the exfoliation of Ca-MMT in Al(OH)3/EVA is conducive to barrier effect of flame retardancy and calcium ions of Ca-MMT can promote the charring of Al(OH)3/EVA. Finally, fire performance indexes (FPI) of MMT-Al(OH)3/EVA composites were calculated with the ratio of time to ignition (TTI) and heat-release peak value. The FPI data verify that the loading of Ca-MMT remarkably contributes to the increase of FPI, thus fire risk of Ca-MMT-Al(OH)3/EVA is significantly decreased.
AB - Montmorillonite containing Ca2+ (Ca-MMT) and montmorillonite modified with organic group (Na-MMT) were used in flame retardant ethylene vinyl acetate copolymer (EVA) with Al(OH)3, respectively. The effect of Ca-MMT was investigated on mechanical, thermal and flammability properties of Al(OH)3/EVA composites, compared with Na-MMT. MMT-Al(OH)3/EVA composites were processed by melt blending in a twin-screw extrude. XRD and TEM show that MMT achieves exfoliation in MMT-Al(OH)3/EVA composites and the exfoliated layer of Ca-MMT is relatively smaller than Na-MMT. Ca-MMT-Al(OH)3/EVA shows better tensile strength and thermal stability than Na-MMT-Al(OH)3/EVA. In Cone calorimeter test, Ca-MMT-Al(OH)3/EVA also performs better than Na-MMT-Al(OH)3/EVA with lower heat release. Moreover, the condensed phase of Ca-MMT-Al(OH)3/EVA exhibits higher thermal insulation through lower and flatter back-temperature curves of CONE, corresponding to the compact and intact residue char surface after CONE. All the evidences indicate that the exfoliation of Ca-MMT in Al(OH)3/EVA is conducive to barrier effect of flame retardancy and calcium ions of Ca-MMT can promote the charring of Al(OH)3/EVA. Finally, fire performance indexes (FPI) of MMT-Al(OH)3/EVA composites were calculated with the ratio of time to ignition (TTI) and heat-release peak value. The FPI data verify that the loading of Ca-MMT remarkably contributes to the increase of FPI, thus fire risk of Ca-MMT-Al(OH)3/EVA is significantly decreased.
KW - Al(OH)
KW - Ca-montmorillonite(Ca-MMT)
KW - Composite
KW - Ethylene vinyl acetate copolymer
KW - Flame retardant
UR - http://www.scopus.com/inward/record.url?scp=85040713434&partnerID=8YFLogxK
U2 - 10.13801/j.cnki.fhclxb.20170320.004
DO - 10.13801/j.cnki.fhclxb.20170320.004
M3 - Article
AN - SCOPUS:85040713434
SN - 1000-3851
VL - 34
SP - 2715
EP - 2721
JO - Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica
JF - Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica
IS - 12
ER -