共查询到19条相似文献，搜索用时 109 毫秒
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用C36二聚酸、癸二酸与1,4-丁二醇二缩水甘油醚和双酚A型环氧树脂进行扩链反应,制备柔韧性环氧树脂预聚体。考察了配方组成、反应温度和催化剂等因素对羧基转化率的影响。结果表明,对于所给配方,当催化剂用量为0.1%,140℃下反应2 h,反应基本完全。另外,以柔韧性环氧树脂预聚体为基体树脂制备的固化物拉伸强度达到12.0 MPa,断裂伸长率为85%。 相似文献
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《安徽教育学院学报》1995,(1)
本文采取双羧基尼龙1010预聚体(PA)与双羟基ε—己内酯预聚体(PCL)经熔融缩聚制得了软硬段含量不同和软硬段分子量不同的尼龙1010—聚己内酯多嵌段共聚物[(PA—PCL)_n]。热分析表明,非晶区PA与PCL有部分混溶性,软段结晶受硬段影响。 相似文献
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祝保林 《渭南师范学院学报》2012,(2):61-66
于加热熔融的氰酸酯树脂(BACDy)中加入异丁烯酸甲酯(MMA),在引发剂存在下,引发单体及预聚体MMA发生本体聚合,采用同步合成法和异步合成法分别制备互穿聚合物网络氰酸酯树脂/聚异丁烯酸甲酯(BACDy/MMA-SIPN)高分子材料,研究了几种不同配比的SIPN体系.结果表明,BACDy/MMA-SIPN网络形成的反应条件对体系的力学性能和耐热性能都有较大提高.给出了较合理的制备工艺条件. 相似文献
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本文利用离散偶极子近似法,研究T型排列的金纳米棒双聚体的表面等离子体耦合共振特性,发现金纳米棒双聚体间距变化时表面等离子体共振消光峰发生红移或者蓝移,适当间距的T型排列金纳米棒双聚体结构可以产生更强的局域表面增强电场.本文对于金纳米棒双体结构的计算结果对于金纳米棒在生物传感方面应用具有一定的参考价值. 相似文献
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本文利用离散偶极子近似法,研究T型排列的金纳米棒双聚体的表面等离子体耦合共振特性,发现金纳米棒双聚体间距变化时表面等离子体共振消光峰发生红移或者蓝移,适当间距的T型排列金纳米棒双聚体结构可以产生更强的局域表面增强电场.本文对于金纳米棒双体结构的计算结果对于金纳米棒在生物传感方面应用具有一定的参考价值. 相似文献
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主悔 《沙洋师范高等专科学校学报》2003,4(5):43-46
本介绍了UV—固化树脂预聚体合成，组成及应用的研究进展情况，综舍分析了光敏树脂在当代经济和科技中的重要作用，具有广阔的应用前景。 相似文献
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测试50Mn中强钢880℃淬火不同温度回火后的力学性能,探讨断裂韧性JIC与V型缺口冲击功AKV和预裂纹冲击功AE 之间的关系,认为JIC与AE之间有较好的线性关系. 相似文献
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将自制的乙酰化竹粉与聚己内酯共混,利用转矩流变仪制备可完全生物降解的竹塑复合材料,考察配方和加工工艺对流变性能的影响,并研究所制备的竹粉／聚己内酯复合材料的力学性能和微观形貌．研究结果表明：乙酰化竹粉／聚己内酯复合材料界面相容性好,力学性能较佳;当乙酰化竹粉在复合材料中的质量分数为35％时,复合材料的拉伸强度大于10MPa,断裂伸长率在400％以上。 相似文献
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采用挤出造粒和注射成型的方法制备聚丙烯／纳米CaCO3复合材料试样条,测试了样条的力学性能,分析和研究了纳米CaCO3粒子的含量对复合材料力学性能的影响。实验结果表明,复合材料的力学性能随着纳米CaCO3含量的增加呈现先升后降的趋势。当纳米CaCO3质量分数达6％左右时复合材料的力学性能较好,超过6％后力学性能开始下降。 相似文献
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再生混凝土力学性能的研究 总被引：1，自引：0，他引：1
对再生混凝土力学性能的研究进行了综述，主要包括再生混凝土力学性能的抗压强度、弹性模量、干缩与徐变。研究表明，和普通混凝土相比，再生混凝土力学性能的抗压强度低，弹性模量小，干缩与徐变较大。最后提出了再生混凝土力学性能需要进一步研究的问题。 相似文献
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To prevent expanded polystyrene (EPS) beads from rising up to the surface in the molding process of EPS lightweight concrete, vibration with pressure was applied and the polyvinyl acetate (PVA) emulsion was adopted to im-prove its mechanical properties. The mechanical properties, thermal properties and durability of EPS lightweight concrete were tested. The microstructures of EPS lightweight concrete were observed by scanning electron microscope (SEM). Vibration with pressure reduces the number of small cracks. The 180 d compressive strength and flexural strength increase obviously as a large amount of PVA was added. The mixed amount of PVA has no obvious influence on the thermal per-formance when it is not more than 10% of the cement. Vibration with pressure and surface modification of EPS beads by PVA improve the combination of EPS beads with cement stone and the mechanical properties of EPS lightweight con-crete. 相似文献
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张萍 《廊坊师范学院学报(自然科学版)》2014,(3):66-68
针对混凝土结构中钢筋的锈蚀问题,总结了锈蚀钢筋力学性能的研究方法、锈蚀对钢筋力学性能的影响及锈蚀钢筋力学性能的变化规律等研究现状,提出了有待继续研究的问题,为进一步建立锈蚀钢筋模型和加强锈蚀钢筋防护奠定基础. 相似文献
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采用甲基丙烯酸甲酯(MMA)与PP接枝共聚物(PP-g-MMA)为界面相容剂,在熔融共混的条件下;利用螺杆挤出机制备PP/MMT复合材料,对其流动性能及力学性能进行了研究.结果表明:PP-g-MMA的加入提高了PP与O-MMT的相客性,当PP-g-MMA用量为20wt%,O-MMT的用量为3wt%时,力学性能最佳:拉伸强度提高了17.46%;常温下冲击强度提高了91.05%;低温(-20℃)条件下的冲击性能比常温下提高了40.29%,比低温下的纯PP提高了246.78%. 相似文献
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In order to obtain the optimized structure rubber, a novel miktoarm star styrene-butadiene rubber (MS-SBR) was initiated by a multifunctional macromolecular initiator with polydiene arm and Sn-C bond. The properties of MS-SBR were investigated with respect to the morphology, mechanical properties, and dynamic viscoelasticity in comparison with those of the blends, natural rubber (NR)/star styrene-butadiene random rubber(S-SBR) blend rubber and cis-1,4-polybutadiene rubber (cis-BR)/S-SBR blend rubber. The samples were analyzed using transmission electron microscopy (TEM), dynamic mechanical thermal analyzer (DMTA), and mechanical properties test. The analysis results show that MS-SBR possesses the desired combination of low rolling resistance and high antiskid resistance, and is promising for application in high performance tire tread. 相似文献
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The morphology of the microstructure of Al-alloy composite with variousfiber contents was examined under optical microscope.The fracture of tension specimenwas studied under scanning electron microscope(SEM).The mechanical properties,wearresistance and coefficient of thermal linear expansion of the composite were measured.Theexperiment shows that the composite studied is suitable for engine pistons due to its goodwear resistance,higher elevated temperature mechanical properties and lower coefficient ofthermal linear expansion. 相似文献
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《浙江大学学报(A卷英文版)》2021,(7)
Understanding the underlying processes associated with the thermo-oxidative performance of the ethylenepropylene-diene monomer(EPDM) is essential for assessing and improving its waterproofing performance in underground infrastructures. To explore the fundamentals of EPDM degradation behavior during thermal oxidation, this paper investigates the effects of hydrocarbon free chain, carbon crosslink, chain scission, hydroxyl, and ether crosslinks, on its kinetics and mechanical properties through molecular dynamics(MD) simulations. Several EPDM thermo-oxidative models were built and verified by comparing the simulation results of oxygen diffusivity, glass transition temperature, and mechanical properties with reported experimental ones. Then the radius of gyration, free volume, density, transport, glass transition, and uniaxial compression performance were investigated via MD simulations. The results show that crosslinking in the thermal oxidation process has a significant influence on the free volume, glass transition temperature, and mechanical properties of the system; the hydroxyl and chain scission mainly interfere with the transport properties; all of these affect the structural conformation. 相似文献