共查询到20条相似文献,搜索用时 93 毫秒
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采用动态硫化方法制备高聚合度聚氯乙烯(HPVC)/SBR共混型热塑性弹性体,考察了单一组分相容剂「相容剂分别为NBR270、NBR P65、CPE和氢化苯乙烯-丁二烯、苯乙烯嵌段共聚物(SEBS)」、复合相容剂(SEBS/NBR和CPE/NBR)及交联程度对HPVC/SBR共混体系相容性的影响。结果表明,使用复合相容剂可明显改善HPVC/SBR共混物的性能;动态硫化在改善共混物力学性能方面起主要作 相似文献
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从硫化特性、热变形值、凝胶质量分数和物理性能等方面考察了四亚乙基五胺(TEPA)对PVC和PVC/NBR共混物的交联作用以及PVC和NBR同时交联对共混物性能的影响。结果表明,PVC/NBR共混物中的PVC组分交联后,共混物的物理性能和热变形性能都有所改善;PVC和NBR两组分同时交联可改善共混物的物理性能和热变形性能,在NBR用量较大(60份以上)时效果更为明显,若NBR用量太低,则共混物热变形性能反而有所下降;交联剂TEPA对硫黄硫化NBR有一定抑制作用,对共混物的物理性能影响不大,但在一定用量范围内有较小的劣化作用 相似文献
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PVC/TPU/SBS—g—MMA共混体系研究 总被引:4,自引:0,他引:4
制备了SBS-g-MMA系列接枝共聚物,并对其进行了表征。以SBS-g-MMA作为PVC/TPU共混体系的增容剂,对不同配比的PVC/TPU/SBS-g-MMA共混体系的物理力学性能、流变性等进行了研究。结果表明,SBS-g-MMA接枝共聚物对PVC/TPU共混体系起到了明显的增容作用。 相似文献
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聚氯乙烯与热塑性聚氨酯的共混改性 总被引:1,自引:0,他引:1
将聚氯乙烯(PVC)与自制的热塑性聚氨酯(TPU)进行共混改性,试验研究了PVC分子量、PVC/TPU共混比及共混方法对共混物性能的影响。结果表明,XS-3型PVC与TPU的相容性最好,性能也较为满意。 相似文献
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The emulsion terpolymerization of methyl methacrylate (MMA), ethyl acrylate (EA), and acrylic acid (AA) was carried out under a nitrogen atmosphere at 70°C. The final terpolymer conversion was determined gravimetrically. The synthesized MMA–EA–AA terpolymer was characterized with 1H‐NMR spectroscopy, thermal analysis, and gel permeation chromatography. Glass‐transition temperatures of the MMA–EA–AA terpolymer were determined with a differential scanning calorimeter. Ethylene–propylene–diene monomer rubber (EPDM)/poly(vinyl chloride) (PVC) blends were prepared with different blend ratios (10/90, 20/80, 30/70, 40/60, and 50/50) in the presence and absence of MMA–EA–AA as a compatibilizer. The morphology of those blends was examined with the aid of a scanning electron microscope. The scanning electron micrographs in the presence of the MMA–EA–AA terpolymer illustrated the disappearance of the macroscale phase separation of EPDM/PVC blends as a result of the incorporation of MMA–EA–AA into that blend, indicating an improvement of the homogeneity. The mechanical properties of the EPDM/PVC blend films and the dielectric properties of the melt blends were investigated. The swelling behavior of the cured blends in the brake fluid was also discussed. The results illustrated that the mechanical properties, the weight swelling values, and the dielectric constant values showed linear behavior versus the blend ratios after the incorporation of the terpolymer. However, those values showed deviations from linearity in the absence of the terpolymer. That, in turn, ensured the results obtained with the scanning electron microscope. The results reveal that the MMA–EA–AA terpolymer prepared can be used successfully to improve the homogeneity of EPDM/PVC blends used in hose and oil seal applications. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
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ChMI/ MMA/AN悬浮共聚物与PVC共混的研究 总被引:6,自引:0,他引:6
通过悬浮共聚得到了N-环己基马来酰亚胺(ChMI)、甲基丙烯酸甲酯(MMA)、丙烯腈(AN)三元共聚物(PCMA),用作耐热改性剂与PVC共混。考察了共聚物用量对共混物热性能、力学性能、流变性能的影响,用扫描电镜(SEM)观察其断面。结果表明:随共聚物用量的增加,共混物的玻璃化温度和维卡软化点明显提高;PVC第一阶段降解速率减小,降解守毕后平台区残留量逐渐上升;拉伸强度明显提高,冲击强度在一定比例范围内几乎不变;熔体表观粘度增加,呈假塑性流体。 相似文献
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Methyl methacrylate/2‐hydroxyethyl methacrylate/maleic anhydride terpolymer with various compositions was synthesized, characterized and investigated as a photostabilizer for rigid polyvinyl chloride (PVC). The chemical structure of the terpolymer MMA/HEMA/MA, was confirmed by ultraviolet–visible and FTIR, spectroscopy. The molecular weights of the terpolymer were determined by applying gel permeation chromatography. The stabilizing efficiency of the terpolymer was evaluated by the determination of the weight loss of PVC/terpolymer blends after various irradiation times. The content of the formed gel as well as the intrinsic viscosity of the soluble fraction of the photodegraded polymer were also determined. The efficiency was also evaluated by measuring the extent of the discoloration of the photodegraded polymer. Thermal gravimetric analysis of the terpolymer and PVC/terpolymer blend were measured. Moreover, physicomechanical properties of photodegraded stabilized PVC samples were as well measured. The results revealed that the photostabilizing efficiency as well as thermal stability increased in the presence of the terpolymer as blended with PVC and by the increase of maleic anhydride ratio in the terpolymer. The photostabilizing efficiencies were compared with the industrially known UV absorber 2‐hydroxy‐4‐(octyloxy) phenylbenzophenone. J. VINYL ADDIT. TECHNOL., 25:E55–E62, 2019. © 2018 Society of Plastics Engineers 相似文献
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通过乳液共聚合得到N-环己基马来酰亚胺(ChMI)、甲基丙烯酸甲酯(MMA)、苯乙烯(St)的三元共聚物(ECMS),用共聚物作耐热改性剂与PVC共混,用TBA和TGA研究了共聚物含量对共混物热性能、力学性能、流变性能及维卡软化点的影响。结果表明随三元共聚物含量的增加,共混物的玻璃化温度及维卡软化点逐渐上升;PVC第一阶段降解完毕。后平台区残留量逐渐上升;拉伸强度提高,冲击强度下降;熔体表观粘度增加,呈假塑性流体。 相似文献
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Synthesis and evaluation of homopolymer and terpolymer based on phenyl salicylate as photostabilizers for rigid polyvinylchloride 下载免费PDF全文
Terpolymer based on polymerizable derivative of phenyl 5‐methacryloxy methyl salicylate (PMMS) methyl methacrylate (MMA)/2‐hydroxyethyl methacrylate (HEMA)/PMMS was synthesized and evaluated as a photostabilizer for rigid polyvinylchloride (PVC). Evaluation of stabilizing efficiency was carried out by measuring the induction period and the rate of dehydrochlorination by the continuous conductometric determination of the hydrochloric acid (HCl) evolved at 25°C under nitrogen in addition to the extent of discoloration. The results indicated that the stabilizing effect of this terpolymer increased upon increasing the stabilizer concentration and the content of the UV absorber units in the terpolymer. The prepared terpolymer showed higher stabilizing efficiency when compared to the homopolymer of the phenyl salicylate‐based monomer and the commercial UV absorber, phenyl salicylate. Structural morphology of PVC/terpolymer blend was investigated using a scanning electron microscopy (SEM) and thermal properties of the blends were also studied using differential scanning calorimetry (DSC). J. VINYL ADDIT. TECHNOL., 23:70–77, 2017. © 2015 Society of Plastics Engineers 相似文献
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PVC/HRA共混物耐热与力学性能研究 总被引:5,自引:0,他引:5
以PMI-St-AN三元共聚物为热改性剂,以ACR为抗冲改性剂,对PVC进行耐热和抗冲改性研究,探讨了共混温度及两种改性剂用量等对共混物物理。力学性能和耐热性能的影响,通过优化制备了耐热,抗冲性能兼备的PVC共混改性新材料。 相似文献
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《国际聚合物材料杂志》2012,61(10):737-747
Rigid poly(γ-benzyl L-glutamate)/flexible poly(vinyl chloride) (PBLG/PVC) blend membranes were prepared by casting the polymer blend solution in dichloroethane. Structure and morphologies of the PBLG/PVC blend membranes were investigated by Fourier transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and scanning electron microscopy (SEM). Thermal, mechanical, and chemical properties of PBLG/PVC blend membranes were studied by differential scanning calorimetry (DSC), tensile tests, and other physical methods. It was found that the introduction of PVC could exert marked effects on the morphology and the properties of PBLG membrane. 相似文献
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采用悬浮共聚合法制备N-苯基马来酰亚胺-苯乙烯-丙烯腈(PhMI-St-AN)三元共聚物耐热改性剂,将其与聚氯乙烯(PVC)共混通过模压发泡制备了PVC/PhMI-St-AN泡沫塑料。借助傅里叶变换红外光谱、差示扫描量热分析等手段对PhMI-St-AN三元共聚物进行了表征,研究了共聚物组成对三元共聚物玻璃化转变温度(Tg)及其与PVC相容性的影响,考察了PVC/PhMI-St-AN泡沫塑料的热尺寸稳定性和吸水性。结果表明,PhMI-St-AN具有良好的耐热性能,其Tg随PhMI含量的增加而提高,PhMI-St-AN三元共聚物提高了PVC/PhMI-St-AN泡沫塑料的热尺寸稳定性,降低了吸水率。 相似文献