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A. Pappa K. MikediA. Agapiou S. KarmaG.C. Pallis M. StatheropoulosM. Burke 《Journal of Analytical and Applied Pyrolysis》2011,92(1):106-110
Blends of nitrile butadiene rubber (NBR) with polyvinyl chloride (PVC) are widely used in products such as hoses and seals. As part of a project that uses NBR/PVC blends for manufacturing forest fire hoses, blends of NBR/PVC with various inorganic fillers, such as Mg(OH)2, china clay (organic modified kaolin) and nano clay (organic modified bentonite) were studied by TG-MS. No significant changes were observed to the type of the polymers’ decomposition products, compared to that of NBR/PVC blend without additives. The most remarkable change was the absence of HCl from decomposition products in the presence of the Mg(OH)2 additive. 相似文献
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界面粘结对聚氯乙烯/丁腈橡胶共混物脆韧转变的影响 总被引:6,自引:1,他引:6
应用丙烯腈(AN)含量不同的丁腈橡胶(NBR)与聚氯乙烯(PVC)共混,研究了界面粘结对PVC/NBR共混物脆韧转变的影响.结果表明:当基体层度T相等时,过强的界面粘结,使PVC/NBR共混物的冲击强度降低,并且其产生脆韧转变的临界基体层厚度Tc减小.界面粘结对于聚合物共混物的增韧行为具有直接的影响.损伤区分析给出:随着界面粘结强度增大,空洞化过程受阻,减弱能量的耗散,并且不利于诱导剪切屈服损伤的产生,因而不利于增韧;但是界面粘强度过小,意味着共混物的相容性太差,致使分散相粒径过大,也不利于增韧.所以对增韧来讲,共混物的界面粘结强度存在一个最佳范围. 相似文献
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聚合物共混物脆韧转变性能研究─—形态参数对聚氯乙烯/丁腈橡胶共混物脆韧转变性能的影响 总被引:1,自引:0,他引:1
研究了非晶的聚氯乙烯(PVC)/丁腈橡胶(NBR)共混物脆韧转变特性,主要包括形态参数─—分散相粒径(d)、体积分数()、特别是分散相粒径分布(б)对其脆动转变性能的影响.结果表明,当d<临界值(d)或>临界值()时,PVC/NBR产生脆韧转变.而且dC随。的增大而减小;随б的增大而增大。增大不利于增韧和脆韧转变的发生。也是影响聚合物共混物脆韧转变的重要形态参数,理论预示与实验结果很好相符.结果并给出PVC/NBR共混物的冲击韧性也是分散相粒间基体层厚度(T)的单参数函数.当T>T时,共混物为脆性;当T≤T时,共混物韧性剧增成为超韧合金.虽然,以分子链结构参数分类,PVC介于准韧性和脆性聚合物之间.结果证实,准韧性聚合物共混物脆韧转变的Tc判据仍然适用于PVC/NBR共混物. 相似文献
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Crosslinking behaviors of acrylonitrile butadiene rubber (NBR)/poly (vinyl chloride) (PVC) alloy, filled with anhydrous copper sulfate (CuSO4) particles, were investigated for the first time by dynamic mechanical analysis (DMA) under hetero and isothermal modes, respectively. In the heterothermal testing, (NBR/PVC)/CuSO4 compound showed two marked increases in the storage modulus (E′), corresponding to coordination crosslinking of NBR-CuSO4 and self-crosslinking of NBR and PVC respectively. During the isothermal testing, a dramatic increase in E′ was found at the initial stage while that of original NBR/PVC alloy was not detected. The marked increase in E′ of (NBR/PVC)/CuSO4 compound was mainly due to the crosslinking induced by coordination between CN and Cu2+. The increasing extent of E′ increased with the rise of CuSO4 content, suggesting the formation of a greater number of crosslinks. Moreover, the activation energy (Ea) of crosslinking process was about 139 kJ/mol. In this work, fourier transform infrared spectrum (FT-IR) and equilibrium swelling method were also performed for the characterization of the compound. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 41–51, 2007 相似文献
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PPC/NBR弹性体的结构与性能 总被引:2,自引:3,他引:2
本文研究了聚丙撑碳酸酯(PPC)/丁腈橡胶(NBR)弹性体结构形态、动态力学性能、力学性能、耐油、耐热氧老化及耐化学介质稳定性。发现PPC/NBR弹性体呈现IPN结构特征,加入PPC使NBR拉伸强度、扯断伸长率大幅度提高。PPC/NBR弹陸体具有优良的耐油及耐热氧老化稳定性。 相似文献
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F. Pruneda J. J. Suñol F. Andreu-Mateu X. Colom 《Journal of Thermal Analysis and Calorimetry》2005,80(1):187-190
Summary Nitrile butadiene rubber (NBR) and NBR/PVC blends were produced using 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ) or not as antioxidant. Controlled ozone degradation was performed in several samples. Thermal, compositional and morphological analysis was performed by means of differential scanning calorimetry, thermogravimetry, chemical analysis and scanning electron microscopy. Thermogravimetry analysis shows four mass loss processes related to plastizicer, complex rubber degradation and metallic oxides and other additives. In NBR (NBR/PVC blends) the onset temperature of the first degradation process varies between 227-231°C (259-262°C) and the apparent activation energy between 26 and 36 kJ mol-1 (36-57 kJ mol-1), the NBR/PVC samples non degraded presents the higher thermal stability. 相似文献
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(NBR/PVC)/CuSO_4复合材料中配位交联反应的研究 总被引:1,自引:0,他引:1
采用差示扫描量热法(DSC)和傅立叶转换红外光谱(FT-IR)对丁腈橡胶/聚氯乙烯合金/无水硫酸铜((NBR/PVC)/CuSO4)混合物的配位交联反应进行了研究.结果表明,(NBR/PVC)/CuSO4共混物在升温过程中出现两个放热峰,分别归因于腈基(—CN)和CuSO4之间的配位交联反应和体系中NBR/PVC的自交联反应.通过对共混物配位交联反应动力学参数的计算发现,混合物中CuSO4含量的多少并未对体系配位交联反应的进行产生影响.同时共混物中PVC的存在促进了配位交联反应的进行,降低了铜离子(Cu2+)与—CN之间配位交联反应的表观活化能Ea. 相似文献
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Wenpin Wang Qing Yao Jianhui Song Binbin Yao Hui Wang Zhibo Li 《Journal of Polymer Science.Polymer Physics》2019,57(11):662-669
The PeakForce Quantitative Nanomechanical Mapping based on atomic force microscope (AFM) is employed to first visualize and then quantify the elastic properties of a model nitrile rubber/poly(vinyl chloride) (NBR/PVC) blend at the nanoscale. This method allows us to consistently observe the changes in mechanical properties of each phase in polymer blends. Beyond measuring and discriminating elastic modulus and adhesion forces of each phase, we tune the AFM tips and the peak force parameters in order to reliably image samples. In view of viscoelastic difference in each phase, a three‐phase coexistence of an unmixed NBR phase, the mixed phase, and PVC microcrystallites is directly visualized in NBR/PVC blends. The nanomechanical investigation is also capable of recognizing the crosslinked rubber phase in cured rubber. The contribution of the mixed phase was quantified and it was found that the mechanical properties of blends are mainly determined by the homogeneity and stiffness of the mixed phase. This study furthers our understanding the structure–mechanical property relationship of thermoplastic elastomers, which is important for their potential design and applications. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019 , 57, 662–669 相似文献
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This work studied the possibility of utilizing nitrile rubber (NBR) to modify the impact properties of poly (ethylene-naphthalate) (PEN). The PEN/NBR ratio used changed from 100/0 to 60/40. At the same time, glass fibers (GF), 40% weight of the PEN component, were used to reinforce the blends to compensate for the loss of mechanical properties of PEN by incorporation of NBR. The results showed that the impact strength of the PEN/GF/NBR blend (PEN/NBR = 60/40) was increased up to 27.6J/m, nearly 5 times higher than that of the neat PEN. Meanwhile, the tensile strength and flexural strength were still maintained at as high as 66.1 MPa and 98.2 MPa, respectively. Dynamic vulcanization further improved the mechanical properties of the PEN/GF/NBR blends, which provided routes to the design of new PEN/elastomer blends. Other properties of the PEN/GF/NBR blends were also investigated in terms of morphology of fractured surface, dynamic mechanical behavior, thermal stability and crystallization, by scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), thermo-gravimetric analysis (TGA) and differential scanning calorimetry (DSC), respectively. 相似文献
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PVC/SBR/MBS三元共混合金的研究 总被引:1,自引:0,他引:1
对PVC/SBR/MBS三元共混合金作了研究。在PVC/SBR体系中加入MBS,PVC的冲击强度可提高5.5倍,弯曲强度的保留率在80%左右。电镜和DDV测试表明MBS的加入提高了SBR对PVC的相容性,增强了橡胶对PVC的界面粘结力。 相似文献
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Fei Lv Jianfeng Fan Jiarong Huang Liming Cao Xuesong Yan Ling Ge Saifudin Abubakar Yukun Chen 《先进技术聚合物》2020,31(10):2161-2171
As the most successful commercialized thermoplastic vulcanizates (TPVs), polypropylene (PP)/ethylene propylene rubber (EPDM) TPVs exhibit poor oil resistance. In this work, we prepared PP/EPDM/butadiene acrylonitrile rubber (NBR) ternary TPVs with good oil resistance using core‐shell dynamic vulcanization. According to the theoretical analysis of the spreading coefficient and the transmission electron microscopy results, the rubber phases exhibited a special core‐shell structure, in which the cross‐linkedNBR‐core was encapsulated by the EPDM‐shell. The core‐shell structure effectively improved the interfacial compatibility between PP and NBR phase as the EPDM‐shell could avoid the direct contact of them, thus improving the mechanical properties of the TPVs. For example, the PP/EPDM/NBR (40/30/30) ternary TPV showed enhanced tensile strength of 12.57 MPa, compared with 10.71 MPa of PP/EPDM (40/60) TPV and 11.11 MPa of PP/NBR (40/60) TPV, respectively. Moreover, the oil resistance of the TPVs was also improved. Compared with PP/EPDM TPV, the change rates in mass, volume, tensile strength and elongation at break of PP/EPDM/NBR TPV after oil immersion decreased by 42.18%, 48.69%, 52.68% and 28.77%, respectively. 相似文献
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Nano-Si O2 and/or Mo O3 were introduced to ethylene-vinyl acetate/nitrile butadiene rubber(EVA/NBR) blends containing magnesium hydroxide(MH) and red phosphorus(RP) to further improve the mechanical properties, oil resistance, smoke suppression and flame retardancy. The results indicated that the tensile strength and oil resistance were significantly improved by incorporating nano-Si O2. Smoke suppression tests for EVA/NBR blend samples showed that both nano-Si O2 and Mo O3 can significantly reduce smoke release amount. The flammability characterization indicated that the blended sample with an LOI value of 33.0 could achieve V-0 level in the UL-94 test. Cone calorimetry test data showed the peak heat release rate was 67% lower than that for pure EVA/NBR. Thermal analysis showed that the presence of both nano-Si O2 and Mo O3 was beneficial to promoting char formation of the EVA/NBR blends. Char residual analysis suggested that Mo O3 aggregated in solid phase during combustion. 相似文献
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根据作者已建立的准网络形态模型和推导出的基体层厚度计算公式,从实验上研究了橡胶粒子的分布对聚氯乙烯(PVC)/丁氰橡胶(NBR)共混物脆韧转变的影响.结果表明,不仅无规形态PVC/NBR共混物存在脆韧转变主曲线,而且准网络形态PVC/NBR共混物也存在脆韧转变主曲线.但是两条主曲线明显不重合,表明橡胶粒子的分布对PVC/NBR共混物脆韧转变有显著影响.而且准网络形态PVC/NBR共混物的临界基体层厚度比无规形态PVC/NBR共混物的临界基体层厚度大得多,表明准网络形态比无规形态明显有利于增韧.因此临界基体层厚度不仅是基体的特征参数,还是界面粘结和橡胶粒子分布的函数. 相似文献
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Journal of Thermal Analysis and Calorimetry - A thermoplastic elastomeric blend from acrylonitrile butadiene rubber (NBR) and plasticized polyvinyl chloride (PVC) in the ratio (1:1) was prepared.... 相似文献