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采用溶液法制备了马来酸酐接枝聚丙烯。采用单因素及正交实验方法研究了单体、引发剂用量、反应温度、反应时间、溶剂用量及引发剂加入工艺等因素对产物接枝率的影响。结果表明,各因素对聚丙烯接枝率都有一定的影响,马来酸酐及二甲苯的用量对聚丙烯接枝率影响最大,当马来酸酐、二甲苯与聚丙烯之间比例为0.1/2/1时,聚丙烯的接枝率最大,接枝率可达4.36%。 相似文献
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在双螺杆挤出机上研制马来酸酐(MAH)接枝的聚丙烯(PP)。主要讨论了聚丙烯(PP)与马来酸酐(MAH)在熔融挤出反应中,引发剂DCP的用量、MAH的用量以及反应温度、物料的停留时间对接枝物的影响。 相似文献
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了提高非极性聚丙烯纤维(PP)的相容性,采用固相法以马来酸酐(MAH)对聚丙烯纤维进行接枝改性,研究了反应条件对接枝率的影响。结果表明,马来酸酐成功接枝到聚丙烯上,当反应温度为80℃,PP用量为0.5 g,MAH用量为0.2 g,BPO用量为0.05 g,回流时间为2.5 h时,最大接枝率可达到7.51%;BPO的用量、MAH单体的用量以及反应温度对PP纤维的接枝率影响较大。而测定PP纤维接枝率时回流时间对其接枝率的影响不大;接枝聚丙烯纤维的分解温度明显高于纯聚丙烯纤维。 相似文献
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以马来酸酐(MAH)为单体、苯乙烯(St)为共单体、过氧化二异丙苯(DCP)为引发剂,采用溶剂热法分别制备了苯乙烯-丙烯腈共聚物(AS)接枝物AS-g-MAH以及AS-g-(MAH-St).利用红外光谱对接枝物进行了结构表征,证明MAH已经成功接枝在AS链上.并用反式滴定法测定了接枝率,讨论了引发剂用量、马来酸酐用量、反应温度、反应时间、反应物浓度和共单体用量对接枝率的影响.结果表明:随着引发剂用量的增加和反应时间的延长,接枝率先增大,然后趋于平稳;随着马来酸酐用量、反应温度和反应物浓度的增加,接枝率先增大后下降;共单体苯乙烯的加入对接枝率的提高有很大的促进作用. 相似文献
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The effect of epoxy and tetramethyl thiuram disulfide on melt‐grafting of maleic anhydride onto polypropylene by reactive extrusion 下载免费PDF全文
In this report, melt grafting of maleic anhydride (MAH) and epoxy resin onto polypropylene (PP) by peroxide‐initiated reactive extrusion has been investigated. As evidenced by Fourier transform infrared spectroscopy, both MAH and epoxy resin were successfully grafted onto PP through the reactions of MAH with PP and epoxy resin with MAH. It was found that tetramethyl thiuram disulfide could promote the grafting of MAH and inhibit the degradation of PP, as revealed by chemical titration and melt flow experiments, through prolonging the lifetime of the macroradical; meanwhile, epoxy resin could reduce the sublimation of MAH and the maximum grafting degree of MAH. Furthermore, the introduction of grafted products was found to enhance the mechanical properties of PP/glass fiber composites, and this influence was very significant at high grafting degrees with a high content of epoxy resin, which could be interpreted in terms of improved compatibility and adhesion at the interface. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43422. 相似文献
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Free‐radical initiated grafting of maleic anhydride (MAH)/polyfunctional acrylate (PFA) multimonomer system onto polypropylene (PP) via reactive extrusion was studied. The effects of PFA and initiator concentration on the grafting reaction were investigated. It was shown that PFA as a comonomer could greatly enhance MAH grafting degree, which increased monotonically as the molar ratio of PFA to MAH increased. The rheology test demonstrated that the viscosity of grafted PP was also promoted as more PFA was used. The formation of branched structure during the grafting process was proved by oscillatory shear rheological analysis. The mechanism of grafting in the presence of PFA was discussed, suggesting PFA had higher reactivity with PP macroradicals than MAH and therefore forming stabilized macroradicals, thus resulting in depression of β‐scission and favoring the formation of branched structure. Higher initiator concentration gave higher MAH grafting degree but more severe degradation. The mechanical properties of the grafted PP were comparable with those of unmodified PP. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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PP熔融接枝MAH的研究 总被引:1,自引:0,他引:1
以PP(EPS30R)为基体树脂,过氧化二异丙苯DCP为引发剂,在反应体系中加入少量的DMF(N,N-二甲基甲酰胺),在双螺杆挤出机中于175℃-190℃进行了PP熔融接枝MAH的反应。用红外光谱表征了接枝反应的存在,并考察了引发剂用量、N,N-二甲基甲酰胺(DMF)的用量、单体用量对接枝反应的影响。研究表明:DMF能抑制PP的降解,并且确定了较佳的原料配比为m(PP):in(MAH):m(DMF):In(DCP):100:3:0.6:0.4,其接枝率可达2.95%。 相似文献
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The influence of 1‐decene as the second monomer on the melt‐grafting behavior of maleic anhydride (MAH) onto polypropylene (PP) was studied with differential scanning calorimetry and Fourier transform infrared spectroscopy. We found that the value of the grafting degree increased from 0.68% for pure MAH‐g‐PP to 1.43% for the system with a 1‐decene/MAH molar ratio of 0.3, whereas the maximum value with styrene (St) as the second monomer was 0.98% under an St/MAH molar ratio of 1.0. Compared with the contribution of St/MAH‐g‐PP to the peeling strength between the PP and polyamide (PA) layer for a PP/PA laminated film, the introduction of 1‐decene/MAH‐g‐PP increased the peeling strength from 180 g/15 mm to 250 g/15 mm. 1‐Decene inhibited the chain scission behavior of PP. 1‐Decene reacted with MAH to form a 1‐decene/MAH copolymer or the Alder‐ene reaction product before the two monomers grafted onto PP. The grafting of the reactive product onto PP greatly improved the grafting degree of MAH. What is more, because of the similar chemical structures of 1‐decene and PP, the affinity of 1‐decene with PP was higher than that of St. Compared with St, the introduction of less 1‐decene led to a higher grafting degree and higher peeling strength. Therefore, we concluded that 1‐decene was more effective for improving the grafting degree of MAH onto PP. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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马来酸酐苯乙烯双单体接枝聚丙烯的研究 总被引:16,自引:3,他引:13
研究了聚丙烯(PP)采用熔融法接枝马来酸酐(MAH)聚乙烯(St)双单体。实验表明,马来酸酐接枝率随其加入量增加而提高;添加两种单体时,马来酸酐添加量保持不变,马来酸酐接枝率随苯乙烯添加量增加而提高。经转矩流变,红外,热失重和差示扫描量热分析表明:马来酸酐,苯乙烯均与聚丙烯发生接枝反应,且有交联网络出现,因此推断出苯乙烯和马来酸酐预先发生交替共聚,共聚物与聚丙烯反应生成最终接枝物。接枝物应用于PP 相似文献
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马来酸酐接枝聚丙烯的研究 总被引:2,自引:0,他引:2
研究了聚丙烯(PP)与马来酸酐(MAH)的接枝配方;并且探索了接枝反应过程中PP自由基的降解抑制方法。结果表明,以引发剂A为引发剂,以嵌段PP为基础树脂,以MAH为接枝单体,以St为第二单体的PP/A/St/ MAH反应体系使PP自由基降解得到了有效的抑制,可制备接枝为1.5%-4.0%的接枝聚丙烯。 相似文献
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A new grafting method was developed to incorporate maleic anhydride directly onto solid‐state polypropylene powders. Maleic anhydride grafts altered the nonpolar characteristics of polypropylene so that much better mixing was achieved in blends and composites of polypropylene with many other polymers and fillers. Maleic anhydride was grafted onto polypropylene by the peroxide‐catalyzed swell grafting method, with a maximum extent of grafting of 4.60%. Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, tensile testing, and impact testing were used to characterize the isotactic polypropylene (iPP), maleic anhydride grafted polypropylene (MAH‐g‐iPP), and (isotactic polypropylene)/(calcium carbonate) composites (iPP/CaCO3). The crystallinity and heat of fusion of the MAH‐g‐iPP decreased as the extent of grafting increased. The mechanical properties of the CaCO3 filled polypropylene were improved by adding MAH‐g‐iPP as a compatibilizing agent. The dispersion of the fillers in the polymer matrix and the adhesion between the CaCO3 particles and the polymer matrix were improved by adding the compatibilizer. 相似文献
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二甲基二苯基丁烷的应用 总被引:4,自引:0,他引:4
利用二甲基二苯基丁烷(DMDPB)作为阻燃增效协同剂与十溴联苯醚在聚丙烯上作了阻燃试验,聚丙烯的防火级别可达FV-0;利用DMDPB作为接枝催化剂,在聚丙烯上作了接枝马来酸酐的试验,马来酸酐的含量达到2.37%;利用DMDPB作为交联引发剂,用聚乙烯进行了紫外交联试验,交联度达到36.9%。 相似文献
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The grafting polymerization of maleic anhydride (MAH) and styrene (St) onto PP was carried out in suspension phase. Infrared
(IR) spectra and 1H-NMR spectra confirmed that MAH and St were successfully grafted onto the PP backbone. The influences, such as monomers concentration,
reaction temperature, initiator concentration and reaction time, on the grafting polymerization rate were also studied, and
then the polymerization model was obtained to describe the polymerization regularities. The results showed that the model
was adequate to reflect the courses, and diffusion and equilibrium adsorption played an important role in suspension polymerization. 相似文献