共查询到20条相似文献,搜索用时 156 毫秒
1.
2.
将自制的PP—g—MAH(聚丙烯接枝马来酸酐)及PP—g—GMA(聚丙烯接枝甲基丙烯酸缩水甘油酯)作为PP/PA6共混体系的相容剂,研究了加入聚丙烯接枝物后PP,PA6塑料合金的各种力学性能及形态结构。结果表明:在PP/PA6共混物中加入PP—g—MAH后,共混物的力学性能得到明显的提高.添加PP—g—MAH对不同比例PP/PA6共混物力学性能的影响不同;用PP—g—MAH和PP—g—GMA两种接枝物共同作为相容剂加入到PP/PA6共混物中比单独使用一种的效果要好。共混物的SEM照片表明。PP—g—MAH是PP/PA6共混物的有效增容剂。 相似文献
3.
4.
5.
以固相接枝聚合的聚丙烯/聚丙烯酸乙酯(PP/PEAK)共混物为主要原料,加入各种助剂,用双螺杆挤出机制备PP/PEAK热塑性弹性体。研究了PP/PEAK共混物的制备工艺、马来酸酐接枝聚丙烯(PP-g—MAH)和双螺杆转速对PP/PEAK弹性体结构和性能的影响。结果表明,固相接枝聚合的PP/PEAK共混物中PEAK与PP的粘结优于简单共混PP/PEAK共混物;PP—g—MAH能改善PP与PEAK的相容性,随着其含量增加,PP/PEAK弹性体的拉伸强度和撕裂强度提高;提高螺杆转速可使PKAK在PP中的分散越来越均匀,但对PP/PKAK弹性体的耐油性能几乎没有影响;PP/PKAK弹性体在IRM903油中于100℃浸泡22h的体积变化只有约10%。 相似文献
6.
GMA/St双组分单体熔融接枝聚丙烯的研究 总被引:2,自引:2,他引:2
分别以甲基丙烯酸缩水甘油酯(GMA)和马来酸酐(MAH)为接枝单体,苯乙烯(St)为接枝共单体,过氧化二异丙苯(DCP)为引发剂对聚丙烯(PP)进行熔融接枝,研究了接枝单体的种类、组分配比等因素对PP的接枝率和熔体流动速率等的影响,并研究了接枝PP的力学性能和耐热变形性能。实验结果表明:作为接枝单体,GMA比MAH更具有优越性;双组分单体熔融接枝PP的接枝率和性能优于单组分单体熔融接枝;接枝PP的结晶参数受其接枝率的影响;当PP/GMA/St/DCP=100/6/3/0、3时,PP—g^-(GMA—CO—St)的接枝率最高,力学性能和耐热变形性能最好。 相似文献
7.
8.
9.
10.
11.
12.
通过双螺杆挤出机聚丙烯熔融挤出接枝马来酸酐制备马来酸酐接枝聚丙烯(PP-g-MAH);研究了接枝单体马来酸酐(MAH)、引发剂DCP及共单体St等对聚丙烯(PP)熔融接枝MAH的接枝率的影响。将制备的接枝物应用于木塑复合材料中,发现木粉与聚丙烯之间的界面结合有了明显的改善,添加的PP-g-MAH增强了木粉和聚丙烯基体之间的黏合性,使两相结合得更紧密,进而提高了木塑复合材料的力学性能。 相似文献
13.
采用热失重方法研究了聚丙烯接枝马来酸酐(PP-g-MAH)的热分解行为,考察了MAH接枝率、PP降解程度和残余MAH单体对PP-g-MAH热稳定性能的影响。结果表明,MAH的接枝可以提高PP的热稳定性能。与PP相比,接枝率为0.72 %的PP-g-MAH起始分解温度升高28 ℃,420 ℃时的热分解速率常数下降57.6 %;接枝过程中PP分子链的降解对PP-g-MAH热稳定性能有不利影响。与降解程度最小的PP-g-MAH相比,降解程度最大的PP-g-MAH起始分解温度降低了20 ℃,420 ℃时的热分解速率常数增加了115 %;PP-g-MAH中残留的MAH使其起始分解温度降低了4.3 ℃。 相似文献
14.
15.
以PP-g-MAH为相容剂,研究了PP-g-MAH对PA6/PP共混体系性能的影响。探讨了PP-g-MAH对PA6/PP共混物增容作用,提高共混物的各项性能指标。当PP-g-MAH为4份时,共混物的力学性能最好,当PA6/PP=90/10时,其力学性能有最大值;SEM照片显示,未加PP-g-MAH时,PP在PA6基体上分散不均,颗粒大,当加入适量的PP-g-MAH(4份)时,PP分散比较均匀,颗粒尺寸明显降低。以PP-g-MAH4份,PA6/PP=80/20制备的共混物,吸水率约是PA6的15%:冲击强度、热变形温度分别比PA6、PP提高了72%和106%,13.5℃和5.5℃。 相似文献
16.
17.
热引发官能化HDPE、PP、EPDM及其增韧PA66研究 总被引:2,自引:0,他引:2
采用热引发熔融接技方法研究了不同反应条件下马来酸酐(MAH)接枝HDPE、接枝共聚PP及接枝EPDM弹性体的接枝反应。结果表明:本热引发接枝法可避免接枝过程中的交联副反应,制得具有较高接枝率(接枝率在0.3%以上),较好熔体流动性能,较少凝胶含量的马来酸酐接枝HDPE、接枝共聚PP及接枝EPDM。采用机械共混法对已官能化的聚烯烃弹性体和聚烯烃塑料分别和混合增韧PA66的情况进行了比较,结果显示:采用PA66/改性聚烯烃弹性体/改性聚烯烃塑料三元共混体系,可以在较少用量的改性橡胶条件下使PA66的缺口冲击强度达到原材料的10倍以上,并且材料弯曲模量损失减少。SEM对PA66/EPDM-g-MHA/PP-g-MAH三元共混体系脆韧转变的研究结果表明:体系分散相中的EPDM-g-MAH向PA66基体扩散、渗透或形成嵌段共聚物的部分是增韧PA66中的有效成分。 相似文献
18.
Seon‐Jun Kim Cheul‐Jung Kang Subhendu R. Chowdhury Won‐Jei Cho Chang‐Sik Ha 《应用聚合物科学杂志》2003,89(5):1305-1310
Correlations among the degree of crosslinking of ethylene vinyl acetate copolymer (EVA), the grafting yield of maleic anhydride (MAH) onto EVA, and the mechanical properties of the blends of poly(butylene terephtalate) (PBT) with EVA‐g‐MAH were investigated. The EVA was functionalized by melt grafting reaction in the presence of MAH and dicumyl peroxide (DCP) using a plasticorder. The grafting yield of MAH was increased by increasing the concentration of MAH and DCP. The flexural strength of PBT–EVA‐g‐MAH blends depends on both the grafting yield of MAH and the degree of crosslinking of EVA, while the crosslinked parts of EVA‐g‐MAH hindered rather than improved the tensile strength regardless of the increase of the grafting yield of MAH. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1305–1310, 2003 相似文献
19.
Qi Fang Li Dong Gil Kim De Zhen Wu Kun Lu Ri Guang Jin 《Polymer Engineering and Science》2001,41(12):2155-2161
Mechanical properties and morphologies of nylon 11/ethylene‐octene copolymer blends have been investigated. The ethylene‐octene copolymer (POE) employed in this study was grafted with maleic anhydride (MAH) and thus has the potential to react with the amine group of nylon 11. Nylon 11/POE‐g‐MAH and nylon 11/POE/POE‐g‐MAH blends with varying MAH graft ratios were prepared. In this paper, the effect of MAH graft ratio on ductile‐brittle transition temperature (DBTT), mechanical properties, and morphology of blends was studied. The results showed that incorporation of POE‐g‐MAH could remarkably improve the compatibility between the nylon and POE elastomers, thus increasing the toughness of the resultant blends. The compatibilizing effect on impact strength became more pronounced with increasing MAH graft ration. DBTTs of blends were initially lowered dramatically with the increasing maleic anhydride graft ratio, but over 0.56% MAH content, DBTTs of blends did not drop further, while tensile strength and tensile modulus dropped slightly because of the decreased glass transition temperature (Tg) of nylon 11/POE blends, resulting from the increased compatibility between the two phases. The role of MAH graft ratio on the POE particle size and dispersion of POE on nylon 11 matrix was also studied. 相似文献
20.
用固相接枝法制备了马来酸酐接枝改性聚丙烯(PP g MAH),研究了PP g MAH增容PP/PA 66共混物的形态结构和性能。结果表明,用PP g MAH增容的PP/PA 66共混物的拉伸强度提高约10MPa,弯曲强度、弯曲模量有所提高,缺口冲击强度和伸长率保持不变。 相似文献