Abstract: The effect of silane coupling agent KH-550 on the compatibilization in the composite of polypropylene/dibromoneopentyl glycol phosphate melamine salt（PP/BPMS）(90/10) was studied. When 0.3 % KH-550 was added, the impact and tensile strength composites were 34.34 MPa and 4.48 kJ/m2, which were 7.9 % and 40.4 % higher than neat PP/BPMS blends, respectively. The composite was self-extinguish and free from burn-dripping. IR and rheological studies proved that KH-550 grafted on the BPMS through chemical linkage. The encapsulation of KH-550 weakened the heterogeneous nucleation of BPMS, as indicated by the large spherulites of PP by POM and the weakened (040) refraction by XRD. The SEM revealed that adhesion of PP and BPMS was improved.

Key words: compatibilization effect, polypropylene, dibromoneopentyl glycol phosphate ester melamine salt, silane coupling agent