PP-g-MAH对SEBS/PP/MH/EG阻燃复合体系结构与性能的影响

在氢氧化镁(MH)与可膨胀石墨(EG)复配阻燃石蜡油改性苯乙烯-乙烯/丁烯-苯乙烯(SEBS)/聚丙烯(PP)共混物(O-SEBS/PP)体系中,用马来酸酐接枝聚丙烯(PP-g-MAH)增容,研究其对O-SEBS/PP/MH/EG阻燃复合体系结构和性能的影响。结果表明:以一定量的PP-g-MAH代替基体中的PP增容后,复合材料在保持UL94垂直燃烧V-0级的同时,拉伸强度(σmax)与100%定伸强度(σ100)随着PP-g-MAH用量的增加而增大,在质量分数为6%时,分别为13.4 MPa和9.0 MPa,较未添加PP-g-MAH时分别提高13.6%和76.5%;撕裂强度则下降4.0%。复合材料的毛细管流变实验和淬断面扫描电子显微照片分析表明:PP-g-MAH的加入改善了复合材料中MH、EG与O-SEBS/PP共混物基体间的界面黏合力,提高了相容性。

Influence of PP-g-MAH on the Structure and Properties of SEBS/PP/MH/EG Flame-retardant Composites

PP-g-MAH was used as a compatibilizer of the SEBS modified by paraffin oil and polypropylene(O-SEBS/PP)blends,filled with magnesium hydroxide(MH)and expandable graphite(EG)flame retardants.The influence of the compatibilizer on the structure and properties of O-SEBS/PP/MH/EG flame-retardant composites was studied.The results indicated that with the increase of PP-g-MAH amounts the tensile strength(σmax)and 100%extension modulus(σ100)of the composites were enhanced while the V-0 rate for the UL-94 vertical test was maintained.With the amount of 6 wt%PP-g-MAH σmax and σ100 of the composite were 13.4 MPa and 9.0 MPa,and increased by 13.6%and 76.5%respectively,compared to that without compatibilizer.However,the tear strength was declined by 4.0%.The capillary rheological test and SEM morphologies of the quenching sections indicated that PP-g-MAH improved the interface adhesion between MH,EG and O-SEBS/PP blends in the composites,and enhanced the compatibility.