摘要
用多组分熔融接枝的方法将甲基丙烯酸缩水甘油酯 (GMA)和苯乙烯 (St)共同接枝到聚丙烯 (PP)上 ,制得具有较高GMA接枝率的多单体接枝聚丙烯 ,PP g (GMA co St) .将PP g (GMA co St)与尼龙 6 (PA6 )进行共混 ,利用扫描电镜 (SEM) ,差示扫描量热计 (DSC)和广角X射线衍射 (WAXD)对共混物的形态和结晶进行了研究 .在共混过程中 ,PP g (GMA co St)与PA6反应原位生成了PP g PA6 ,有效改善了共混物的相容性 ,分散相尺寸明显减小 .在PP g (GMA co St) PA6为 3 7的体系中 ,PP g (GMA co St)出现分级结晶现象 ,其在较低温度下的结晶属于均相成核结晶 .在PP g (GMA co St) PA6为 7 3的体系中 ,由于PA6相分散细微 ,在通常结晶温度下不结晶 ,而是在低温下均相成核与PP g (GMA co St)同时结晶 .WAXD证实体系中接枝PP ,PA6为分别结晶 。
The Glycidyl Metbacrylate (GMA)/Styrene(St) multi-monomer melt-grafted polypropylene, PP-g-(GMA-co-St), which has a high grafting degree of GMA, was blended with Polyamide 6 (PA6). The morphologies and crystallization of the blends were investigated by means of SEM, DSC and WAXD. PP-g-PA6, which formed during the reactive blending process, improved greatly the compatibility of the blends and reduced the size of the dispersed phase dramatically. In the PP-g-(GMA-co-St)/PA6 = 3/7 blend, the fractionated crystallization of PP-g-(GMA-co-St) was observed. The crystallization of PP-g-(GMA-co-St) at the lower temperature should be assigned to homogeneous nucleation. In the 7/3 blend, due to the fine dispersion of PA6 phase, PA6 did not crystallize at its normal crystallization temperature (T-c), but crystallized in the mode of homogeneous nucleation at a lower T, simultaneously with the crystallization of PP-g-(GMA-co-St). The WAXD showed PP-g-(GMA-co-St) and PA6 crystallized separately and no new crystalline forms formed in the blends.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2002年第3期282-286,共5页
Acta Polymerica Sinica
基金
华南理工大学聚合物成型装备国家工程研究中心科学与技术基金资助项目 (编号 99 0 0 1)
