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研究了两种相容剂马来酸酐接枝聚丙烯(PP-g-MAH)、马来酸酐接枝乙烯-辛烯共聚物弹性体(POE-g-MAH)对聚丙烯/尼龙6(PP/PA6)共混体系力学性能的影响.通过扫描电子显微镜(SEM)、差示扫描量热仪(DSC)分析和力学性能测试,研究了相容剂POE-g-MAH和PP-g-MAH对PP/PA6共混物相容性、形态结构和力学性能的影响.研究结果表明:两种相容剂的加入都使PP/PA6体系的相容性增加,但PP-g-MAH的加入主要表现为增强效果,而POE-g-MAH的加入主要表现为增韧效果. 相似文献
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以过氧化二异丙苯(DCP)和过氧化二苯甲酰(BPO)为引发剂,采用熔融法制备了马来酸酐(MAH)接枝反式聚异戊二烯(TPI)共聚物(TPI-g-MAH),通过傅里叶变换红外光谱仪、核磁共振波谱仪和差示扫描量热(DSC)仪对TPI-g-MAH进行了表征,探讨了接枝反应机理,研究了DCP和MAH用量对接枝产物TPI-g-MAH力学性能的影响。结果表明,以DCP、BPO作为引发剂,用熔融法制备的TPI-g-MAH均存在接枝现象,MAH主要与TPI中的α氢原子发生取代反应而接入TPI大分子链上,用DCP作为引发剂接枝率高、凝胶质量分数小。TPI-g-MAH的DSC谱图由双峰分布转向单峰分布,加入DCP引发剂得到的TPI-g-MAH比加入BPO引发剂得到的TPI-g-MAH的DSC谱图熔融峰窄、峰面积小。与纯TPI相比,TPI-g-MAH的拉伸强度下降,随着MAH和DCP用量的增加,TPI-g-MAH的拉伸强度下降明显。 相似文献
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马来酸酐接枝物对PE/PA6共混物相容性的影响 总被引:2,自引:0,他引:2
采用熔融共混法制备了PP/PA6/POE-g-MAH和PP/PA6/PP-g-MAH共混物。通过扫描电子显微镜(SEM)、差示扫描量热(DSC)仪分析和力学性能测试研究了增容剂POE-g-MAH和PP-g-MAH对PP/PA6共混物相容性、形态结构和宏观力学性能的影响。结果表明,在PP/PA6共混体系中分别加入POE-g-MAH和PP-g-MAH不仅能显著改善两相界面的相容性,减小分散相的粒径,而且能使共混物的力学性能显著提高。当增容剂的用量为5份时,PP/PA6共混物有较好的综合力学性能。POE-g-MAH和PP-g-MAH增容PP/PA6共混体系非等温结晶行为的研究表明,POE-g-MAH和PP-g-MAH均能促进PA6对PP基体的异相成核作用。 相似文献
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Study on NBR/PP
grafting crosslinking system 总被引:1,自引:0,他引:1
以MP(马来酸酐接枝聚丙烯)作为NBR/PP弹性体的增容体系,采用3种引发体系BPO为引发剂,DCP为引发剂和没有引发剂研究对接枝反应的影响。还对不同橡塑比及3种不同的硫化体系DCP体系,酚醛树脂体系及硫黄体系对NBR/PP共混体系的影响进行了探讨。通过DSC,TEM对产品的亚微观结构进行了验证。 相似文献
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聚丁二酸丁二醇酯与聚乳酸共混型全生物降解材料的结构和性能研究 总被引:2,自引:0,他引:2
通过机械共混法,使聚丁二酸丁二醇酯(PBS)、聚乳酸(PLA)熔融共混,制备了一种完全生物降解塑料。用红外光谱(FTIR)法、DSC(DifferentialScanningCalorimetry)法、扫描电镜法(SEM)及力学测试等手段研究了不同组分配比情况下共混物的结构、热性能以及力学性能变化。并研究了聚丙撑碳酸亚丙酯(PPC)的加入对共混体系性能的影响。结果表明:随着PBS含量的增加,PBS/PLA共混体系的拉伸强度降低不多,而断裂伸长率显著提高。而PPC的加入能够提高共混体系的相容性并显著提高体系的韧性。 相似文献
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采用熔融反应共混法,通过引入过氧化二苯甲酰(BPO),对聚乳酸/聚丁二酸丁二醇酯(PLA/PBS)进行增黏改性。研究了该PLA/PBS反应共混物的流变性能、凝胶分数、热性能、力学性能和断面微观形貌。结果表明:随着BPO用量的增加,PLA/PBS反应共混物的转矩和凝胶分数均增大;PLA/PBS反应共混物的结晶性和熔点(Tm)随着BPO用量的增加而降低,且出现熔融双峰,当BPO用量增至1 phr时,熔融双峰消失,PLA和PBS间的相容性显著改善;随着BPO用量的增加,PLA/PBS反应共混物的断裂伸长率、拉伸强度、冲击强度均有所提高,而玻璃化转变温度(Tg)先降后升,体系的内耗则逐渐降低。 相似文献
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硅橡胶/顺丁橡胶/乙丙橡胶共混材料的研究 总被引:5,自引:0,他引:5
针对硅橡胶具有较高耐热性.但力学性能差;三元乙丙橡胶(EPDM)力学性能较好,但互粘性较差;顺丁橡胶(BR)弹性好.但加工性能堇的特点,提出了将硅橡胶、三元乙丙橡胶与顺丁橡胶共混的方法,制成共混材料;再通过测定样品的性能,确定共混的最佳配比。结果表明:BR与EPDM、硅橡胶相客性较好,可达到共硫化;硅橡胶/BR/EPDM质量比为20/30/50时,共混物的物理机械性能和老化性能较好;用过氧化二异丙苯(DCP)/硫磺作硫化剂要好于用硫磺、过氧化二苯甲酰(BPO)和硫磺/BPO硫化剂。试样的耐热老化性能、邵尔A型硬度和扯断伸长率较好,其中样品的综合性能具备了硅橡胶、顺丁橡胶和三元乙丙橡胶的优点。 相似文献
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The purpose of this article is that the silica‐modified SBR/BR blend replaces natural rubber (NR) in some application fields. The styrene‐butadiene rubber (SBR) and cis‐butadiene rubber (BR) blend was modified, in which silica filler was treated with the r‐Aminopropyltriethoxysilane (KH‐550) as a coupling agent, to improve mechanical and thermal properties, and compatibilities. The optimum formula and cure condition were determined by testing the properties of SBR/BR blend. The properties of NR and the silica‐modified SBR/BR blend were compared. The results show that the optimum formulawas 80/20 SBR/BR, 2.5 phr dicumyl peroxide (DCP), 45 phr silica and 2.5 mL KH‐550. The best cure condition was at 150°C for 25 min under 10 MPa. The mechanical and thermal properties of SBR/BR blend were obviously modified, in which the silica filler treated with KH‐550. The compatibility of SBR/BR blend with DCP was better than those with benzoyl peroxide (BPO) and DCP/BPO. The crosslinking bonds between modified silica and rubbers were proved by Fourier transform infrared analysis, and the compatibility of SBR and BR was proved by polarized light microscopy (PLM) analysis. The silica‐modified SBR/BR blend can substitute for NR in the specific application fields. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011. 相似文献
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用KH-550改性白炭黑增强SBR/BR并用胶研究 总被引:1,自引:0,他引:1
丁苯橡胶(SBR)与顺丁橡胶(BR)进行共混改性,加入交联剂改善两者的相容性,并通过加入硅烷偶联剂了一氨丙基三乙氧基硅烷(KH-550)对白炭黑进行改性,增加其力学性能。测定试样的性能并确定具有最佳性能时的配比及最佳工艺参数。实验结果表明:在SBR/BR并用胶质量比为80/20时力学性能和耐老化性能较好;得到了最佳硫化工艺参数:硫化温度150℃;压力10MPa;时间20min;加入硅烷偶联剂KH-550后。胶料的力学性能得到明显改善。当加入硅烷偶联剂KH-5502.5mL时性能最为优异;加入交联剂过氧化二异丙苯(DCP)、过氧化二苯甲酰(BP0)都增加了两者的相容性,当加入两种交联剂DCP与BPO的质量比为1/3时相容性最佳。通过对空白试样及共混物试样进行FT—IR谱图分析和偏光显微镜照片分析,前者证明了SBR和BR之间产生了新的交联键,而后者证明了相界面的相容性提高了,胶料的机械性能和热老化性能得到显著提高。 相似文献
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Xin Ge Mingming Chang Wei Jiang Bangwen Zhang Ruiguang Xing Chaoke Bulin 《应用聚合物科学杂志》2020,137(44):49354
In this work, biodegradable lignin/poly(lactic acid) (PLA) blends were prepared with melting compounding method. Dicumyl peroxide (DCP) and maleic anhydride (MA)/biphenyl peroxide (BPO) were used for the modification of the polymer blends, respectively. Structure of the polymer blends was characterized with Fourier transformed infrared spectroscopy and field emission scanning electron microscopy. Mechanical properties of the samples were determined with universal test machine and dynamic mechanical analysis. Thermal behaviors and thermal stability of the blends were all characterized with a thermal gravimetric analysis/differential scanning calorimetry simultaneous thermal analyzer. Lignin reinforced the mechanical strength of the blends while the thermal stability was not improved. At low content, DCP and MA/BPO apparently enhanced the mechanical strength of lignin/PLA blends. However, excessive DCP led to decreased tensile strength and elongation at break. Both DCP and MA/BPO resulted in lower glass transition temperature and melting temperature of PLA in the blends, while the thermal stability of the polymer blends was poorer after modification. 相似文献
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乙烯基酯树脂固化条件及其复合材料的研究 总被引:1,自引:0,他引:1
研究了过氧化二苯甲酰(BPO)、过氧化二异丙苯(DCP)、过氧化苯甲酸叔丁酯(TBPB)3种固化剂对乙烯基酯树脂固化工艺的影响,并根据固化工艺制备出树脂浇铸体及其碳纤维复合材料。采用差示扫描量热(DSC)法研究了不同树脂固化体系的反应放热特性,采用扫描电镜(SEM)分析了浇注体的断面的表面形态。并对浇注体及复合材料进行了力学性能测试和热稳定性表征,结果表明制得的复合材料具有优良的力学性能和热稳定性。 相似文献
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Tailoring morphology to improve the gas‐barrier properties of thermoplastic polyurethane/ethylene‐vinyl alcohol blends
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Xiumei Gao Dekun Sheng Xiangdong Liu Tongbing Li Fance Ji Yuming Yang 《Polymer Engineering and Science》2016,56(8):922-931
The morphology and helium‐barrier properties of thermoplastic polyurethane (TPU)/ethylene‐vinyl alcohol (EVOH) blends with and without dicumyl peroxide (DCP) were investigated by melting blending. A lamellar dispersion of EVOH with good helium‐barrier properties was observed in the TPU matrix with DCP. The evolution of the morphology of the blends is mainly related to the variation of the viscosity ratio between the dispersed phase and the matrix phase. Compared with pure TPU, lamellar morphology increased the helium‐barrier properties of the TPU/EVOH (60/40) blend by as much as 10‐fold. We also explored the effects of composition, DCP content, and blending sequence on the morphology and helium‐barrier properties of the TPU/EVOH blends. The morphology of the blends ranged from a droplet‐matrix to a lamellar structure. We determined the optimum amount of DCP to improve the helium barrier of the blends. The helium‐barrier properties of the blends prepared by direct blending were superior to those of the blends prepared by two‐segment blending, and the blends prepared by direct blending exhibited a well‐developed lamellar morphology. We compared the permeability of the samples with the theoretical results to explain the relationship between morphology and helium‐barrier properties. POLYM. ENG. SCI., 56:922–931, 2016. © 2016 Society of Plastics Engineers 相似文献