共查询到19条相似文献,搜索用时 187 毫秒
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采用固相接枝技术合成聚乙烯(PE)-马来酸酐(MAH)-甲基丙烯酸甲酯(MMA)-丙烯酸丁酯(BA)三元固相接枝共聚物,并利用傅立叶变换红外光谱分析了接枝聚合物的结构.考察了单体配比、单体总质量、引发剂过氧化二苯甲酰(BPO)、界面活性剂二甲苯和反应温度对接枝反应的影响.结果表明,MAH, MMA和BA三种单体都参与了固相接枝反应.接枝率随MAH和MMA用量的增加而增加,随BA用量的增加变化不大.引发剂BPO用量为聚乙烯质量的2 %时,接枝率最高;过量的界面活性剂不利于提高接枝率,适量的界面活性剂为聚乙烯质量的30 %;当BPO用量为聚乙烯质量的2%时,接枝共聚物的凝胶含量较高. 相似文献
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以过氧化苯甲酰(BPO)为引发剂,采用固相接枝法以二甲苯为溶剂在超高相对分子质量聚乙烯(PE-UHMW)粉末表面接枝了马来酸酐(MAH),研究了接枝过程中反应时间、BPO用量以及MAH用量对粉末接枝率以及交联度的影响。利用全反射傅里叶变换红外光谱仪、X射线光电子能谱分析仪、扫描电子显微镜以及热重分析仪对接枝粉末的表面化学结构及形态进行了分析。结果表明,随着反应时间以及BPO用量的增加,PE-UHMW粉末的接枝率和交联度都呈增加的趋势,而PE-UHMW粉末的接枝率随MAH用量的增加而增加,同时交联度呈下降趋势,这证明MAH用量的增加对交联度有一定程度的抑制作用,产物的接枝率和交联度最高可达1.62 %和69 %。 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
本文以二甲苯为溶剂,BPO为引发剂并采用滴加引发剂的方法合成了马来酸酐(MAH)接枝PP树脂。在研制过程中,考察了引发剂用量,MAH与引发剂的配比、溶剂用量,引发剂滴加时间对PP接枝率和产率的影响,结果表明,接枝率随引发剂用量的增加而相应提高,因此可以通过控制引发剂用量来控制接枝率,引发剂用量对产率影响不大;随MAH/BPO比例的增加,接枝率有增加的趋势,但产率有明显下降;溶剂用量对接枝率无大影响,但产率随溶剂用量增加而降低;随引发剂滴加时间的延长,接枝率有明显提高,而产率无明显变化。 相似文献
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POE熔融挤出接枝MAH的研究 总被引:2,自引:0,他引:2
采用熔融法制备POE接枝MAH,利用红外光谱对其结构进行表征。考察了MAH和过氧化二异丙苯(DCP)对接枝率及熔融指数的影响。结果表明:MAH用量增加,接枝率逐渐增大,熔体流动速率逐渐下降;随着引发剂用量的增加,接枝率也随之增加,熔体流动速率却显著下降。同时对POE接枝MAH的机理进行了探讨。 相似文献
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为提高溶聚丁苯橡胶(SSBR)与极性物质的相容性,以马来酸酐(MAH)为极性单体对SSBR进行接枝改性。研究了MAH用量、引发剂过氧化苯甲酰(BPO)用量、反应时间和反应温度等对接枝聚合物(SSBR-g-MAH)的接枝率和凝胶率的影响。结果发现,随MAH、BPO用量增加和反应时间延长,接枝聚合物的接枝率呈现先增大后降低的变化趋势,而凝胶率变化则与之相反;随反应温度的升高,接枝率依然先增大后降低,但凝胶率却一直增大。热重分析表明接枝橡胶与SSBR具有相同的耐热性,分解温度均在360℃左右,并采用傅里叶红外法对接枝产物的结构进行了表征。 相似文献
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ABS树脂熔融接枝马来酸酐的研究 总被引:7,自引:2,他引:5
研究了在双螺杆挤出机中使用自制的引发剂进行马来酸酐(MAH)熔融接枝(丙烯腈/丁二烯/苯乙烯)共聚物(ABS)的反应,对反应机理进行了讨论,红外光谱分析证明,MAH成功地被接枝到ABS的主链上,对ABS的组分分离证明接枝发生在ABS的丁二烯部分。研究了MAH用量,引发剂含量,反应温度和螺杆转速及溶剂对接枝反应的影响,发现接枝率随着MAH用量的增加,反应时间和螺杆转速的增加而增大;当增大引发剂含量时,接枝率呈现先增加后降低的趋势,自制引发剂比常用的过氧化二异丙苯(DCP)或过氧化苯甲酰(BPO)引发剂接枝效果要好得多,而且受加工条件的影响小。 相似文献
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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
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以过氧化二异丙苯(DCP)为引发剂、马来酸酐(MAH)为接枝改性单体和聚乙烯(PE)为主要原料,采用熔融挤出法制备了铝塑复合板用PE-g-MAH(聚乙烯接枝马来酸酐)基HMA(热熔胶),并着重探讨了DCP和MAH含量对PE-g-MAH的接枝效率和粘接性能等影响。结果表明:在试验范围内,PE-g-MAH的接枝效率(y)与DCP含量(x1)或MAH含量(x2)之间的关系符合y=28.03x1+1.49或y=0.73x2+10.65的线性关系;当w(DCP)=0.44%、w(MAH)=2%时,PE-g-MAH基HMA的粘接性能相对最好,其剪切强度(6.10 MPa)高于杜邦HMA(4.26 MPa),并且其接枝效率为12.91%。 相似文献
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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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反应挤出法制备马来酸酐接枝POE 总被引:8,自引:1,他引:8
采用双螺杆挤出机反应挤出制备马来酸酐接枝乙烯-1-辛烯共聚物(POE-g-MAH)。通过红外光谱分析(FTIR)、化学滴定等方法,揭示MAH过氧化二异丙苯(DCP)及供电子体(EDS)对接枝物的接枝率(GD)、凝胶率、熔体指数(MI)的影响规律。MAH和DCP的加入使MI降低,GD增大;过量的MAH使激发态的MAH猝灭,导致能引发接枝反应的激发态MAH和大分子自由基的数量减少,从而使MI上升及GD下降。在高剪切、短停留时间的挤出机中,EDS会使接枝物的性能恶化。与传统的EPDM-g-MAH增韧尼龙相比,PA/POE-g-MAH复合材料的强度保持相当,而韧性明显提高。 相似文献
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This study focuses on creating an optimal grafting compatibilizer for blends of polypropylene carbonate (PPC) and polybutylene succinate (PBS). PPC and PBS were blended separately with different amounts of maleic anhydride (MAH) and with and without dicumyl peroxide (DCP) to aid the free-radical grafting. Titration analysis evidenced that MAH reacted with the polymers terminal groups and backbones using free-radical functionalization. Thermogravimetric analysis (TGA) and gas permeation chromatography (GPC) results demonstrated how the thermal stability of PPC improves with the addition of MAH. Proton NMR proved that, in both PPC and PBS formulations, ring-opening reactions and grafting of the intact MAH ring occur, as well as interchain grafting producing network structures. The rheological analysis showed that small quantities of MAH and DCP increase the viscosity of the resins. The compatibilizer that was determined to be most reactive and stable of all the formulations analyzed was PPC with 2% MAH and DCP and its effect in the morphology of PPC-PBS blends was proven successful by a reduction of the PPC droplet size. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47553. 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