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《精细化工》2021,(6)
以聚氯乙烯(PVC)为基体,对苯二甲酸二辛酯(DOTP)为增塑剂,与超细活性CaCO_3、钙锌热稳定剂(简写为Ca-Zn)、乳化剂OP-10、润滑剂液体石蜡复合改性制备了PVC基阻尼材料。采用动态流变仪、动态热机械分析仪、SEM对试样的性能和形态进行了表征,运用正交设计探究各组分对材料性能的影响。结果表明,CaCO_3与DOTP的质量比对PVC基阻尼材料阻尼性能的影响最显著;当m(PVC)∶m(Ca-Zn)∶m(CaCO_3)∶m(DOTP)∶m(OP-10)=42.75∶2.25∶31.8∶21.2∶2时,25℃、频率在0.01~150 Hz范围内,制备的阻尼材料的tanδ最大值为0.604;剪切速率0.1和150 s~(-1)时,表观黏度分别为3738和2.19 Pa·s,具有优异的抗流挂性与稳定性。通过对样品形态分析构建了微观聚集态模型,提出刚性填料团聚-解团聚和聚合物微球变形对流变性能的作用机理。 相似文献
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俞丽珍 《现代塑料加工应用》2006,18(5):31-34
考察了填充剂、热稳定剂及碳黑对PVC糊流变性能、存放性能及其力学性能的影响。结果表明,加入纳米TiO_2,PVC糊的粘度在剪切速率变化时,粘度变化很大,存放10d后粘度下降很少,仅下降0.3 Pa·s。玻璃微珠和滑石粉对PVC糊的硬度影响较为明显;添加硬脂酸钡,PVC糊存放10d后粘度仅下降0.4 Pa·s,存放性能较好;碳黑用量为0.5g时,PVC糊流动性能基本不变。 相似文献
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聚硅氧烷侧链高分子液晶电流变液体的性能研究 总被引:1,自引:0,他引:1
研究聚硅氧烷侧链高分子液晶配制成电流变液体的电流变效应 ,以获得高性能的电流变液体 ,应用德国RV2 0电流变仪测试性能。结果表明 ,该电流变液体 5 2℃ ,电场强度由零增至DC 2 0 0 0V/mm ,剪切速率为 30 0s-1时 ,剪切应力由 2 0 0Pa增至 5 4 0 0Pa ,表观黏度由 2 0 0mPa·s增至 10 0 0 0mPa·s;剪切速率为 4 0 0s-1时 ,剪切应力由 2 0 0Pa增至 6 30 0Pa,表观黏度由 2 0 0 0mPa·s增至 76 0 0mPa·s ;剪切速率为 5 0 0s-1时 ,剪切应力由 2 75Pa增至 6 80 0Pa,表观黏度由5 0 0mPa·s增至 90 0 0mPa·s。 77℃时 ,同样条件下 ,剪切速率为 5 0 0s-1时 ,剪切应力达 80 0 0Pa,具有更高的剪切应力 ,说明温度适应性较强。 相似文献
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以二乙醇胺(DEA)、丙烯酸甲酯(MA)、三羟甲基丙烷(TMP)、顺丁烯二酸酐(MAH)为原料,合成了一种端羧基超支化大单体HPAE-C。并以HPAE-C、丙烯酰胺(AM)、丙烯酸(AA)以及2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,在水溶液中进行自由基聚合得到一种四元共聚物稠化剂PHPAE-C。通过FTIR和1HNMR对其结构进行表征。评价了超支化稠化剂的溶液性质和交联性能。结果表明,稠化剂质量浓度为3000 mg/L(剪切速率为7.34 s-1,25℃)时,溶液表观黏度可达846.7 mPa·s,升温至90℃时,黏度仍为570 mPa·s,并且在Na+质量浓度为6000 mg/L、Ca2+和Mg2+质量浓度为600 mg/L时表观黏度仍能达到300mPa·s以上,说明PHPAE-C具有良好的增黏、耐温、耐盐和抗剪切性能;在交联比m(聚合物水溶液)∶m(乙酰丙酮锆)=100∶0.06、交联温度为55 ℃、pH=5时交联效果最佳。并对交联效果最佳的压裂液进行了性能评价,结果表明,在120℃、170s-1下剪切80 min后,该体系的表观黏度可达到450 mPa·s左右,并且是一种具有良好悬砂、破胶性能的低伤害压裂液体系。 相似文献
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吴若;段辉丽;刘春林 《中国塑料》2010,24(12):80-83
采用毛细管流变仪研究无卤阻燃聚碳酸酯/丙烯晴-丁二烯-苯乙烯共聚物(PC/ABS)的流变行为,得到了熔体表观黏度及切应力与剪切速率的关系。结果表明,无卤阻燃PC/ABS合金熔体为假塑性流体,表观黏度随剪切速率的增加而降低;在230 ℃时,合金的非牛顿指数随着阻燃剂含量的增加而增加;在剪切速率为20~3000 s-1时,合金黏度对温度不敏感,即实现黏度降低,采用升温法效果不佳。 相似文献
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The electrical and damping behaviors of chlorinated polyethylene (CPE)/2,2′‐methylene‐bis‐(4‐methyl‐6‐cyclohexylphenol) (ZKF)/vapor‐grown carbon fiber (VGCF) have been investigated. CPE/ZKF/VGCF systems exhibit typical percolation characteristics of filled conductive polymer composites. For CPE/ZKF/VGCF composites, dynamic mechanical analysis (DMA) shows that, at the glass transition temperature (Tg) of CPE/ZKF system, the values of loss factor increase with the increasing VGCF content. Within the temperature range of 60–75°C, the values of loss factor for CPE/ZKF/VGCF samples are higher than that of CPE/ZKF and present a peak at 16 vol% VGCF content. This implies that the piezo‐damping effect is directly related to the conductive network formation in the composites, and the piezo‐damping effect can be regulated by regulating the VGCF content. Therefore, the composite of CPE/ZKF/VGCF is a good damping material with a high and broad loss factor that can be regulated according to practical applications. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3181–3185, 2006 相似文献
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Dejan D. Andjelkovic Yongshang Lu Michael R. Kessler Richard C. Larock 《大分子材料与工程》2009,294(8):472-483
A series of various soybean oil/dicyclopentadiene (DCP) thermosetting copolymers with renewable carbon percentages of 53–86% have been prepared by cationic copolymerization of regular (SOY) or 100% conjugated soybean oils (C100SOY) with DCP initiated by NFO ethyl ester modified and SOY‐ and C100SOY‐diluted BF3 diethyl etherate. The effects of stoichiometry, the type of soybean oil, and the initiator on the mechanical and damping properties of the copolymers have been investigated. The materials exhibit compressive stress/strain behavior ranging from soft rubbers to tough and ductile plastics, and possess good damping properties. They represent promising new materials for efficient sound and vibration damping applications over a broad temperature and frequency range.
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四针状氧化锌晶须改性硅橡胶的性能 总被引:1,自引:0,他引:1
制备了四针状氧化锌晶须(ZnOw)/硅橡胶复合材料;详尽地研究了晶须改性硅橡胶复合材料的力学性能、热稳定性及阻尼性能;通过扫描电镜观察了材料的断面以及晶须在基体中的分散性。结果表明:随氧化锌晶须填充量的增加,硅橡胶的力学性能降低,热稳定性和阻尼性能有明显的提高。当填充量为20份时,与纯硅橡胶相比,复合材料的热分解温度提高了近10 ℃,最大损耗因子提高了21%,有效阻尼温域向高温偏移了约15 ℃。 相似文献
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通过在聚氨酯涂料中添加氢氧化铝[Al(OH)3]、可膨胀石墨(EG)、三(2-氯异丙基)磷酸酯(TCPP),制备了兼具阻尼与阻燃性能的聚氨酯阻尼涂料。研究了3种阻燃剂对涂料力学性能、阻燃性能与阻尼性能的影响,研究结果表明:Al(OH)3能提高材料的力学性能和阻燃性能,温度较低时,能提高阻尼性能,温度较高时,将降低阻尼性能;适量的EG能够显著提高材料阻燃性能与阻尼性能;TCPP可以提高材料的断裂伸长率,在添加量较少时,显著提高材料的阻燃性能,但材料阻尼性能有所降低。 相似文献
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溴化丁基橡胶/C5石油树脂复合材料的制备及性能研究 总被引:1,自引:0,他引:1
在溴化丁基橡胶(BIIR)中添加了不同用量的C5石油树脂(以下简称G),通过模压硫化制备了BIIR/C5复合材料。采用无转子硫化仪、门尼粘度仪、扫描电子显微镜(SEM)和动态热力学分析仪(DMA)等研究了C5含量对BIIR/Cs复合材料的结构与性能的影响。研究结果表明,随着C5用量的增加,BIIR/G复合材料正硫化时间(t90)略有延长,交联程度及门尼粘度下降,加工性提高,损耗峰呈现单峰状,不断向高温偏移,损耗因子(tanδ)峰值及峰面积不断增大,且有效阻尼温域(tan δ≥0.3)大幅度扩宽;拉伸强度、撕裂强度及硬度和冲击回弹率不断下降,断裂伸长率增大,但复合材料在G用量为5~10phr时仍能保持较高的力学强度。 相似文献
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Hongwei Cui Qian Jing Dongwei Li Tingting Zhuang Yixing Gao Xianghai Ran 《应用聚合物科学杂志》2023,140(1):e53262
Rubber damping materials have important applications in modern industrial systems. However, their damping temperature range is low, which is not suitable for the damping demand under high temperature conditions. At present, there is very little research on the damping performance of rubber under high temperature conditions. Silicone rubber has excellent high temperature resistance but poor damping in its application temperature range. In this study, a boron-terminated polysiloxane (PBS) was prepared by modifying hydroxy-terminated polydimethylsiloxane (PDMS-OH) with boric acid (BA). The molecular structure of PBS was confirmed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC) analysis. Rheology measurements revealed that PBS was a “shear hardening” material. Then, the silicone rubber was modified with PBS. With the introduction of boron atoms, boron and oxygen dative bonds with dynamic properties could be formed inside the silicone rubber, which played an energy dissipation role in the process of association/dissociation. Dynamic mechanical analysis (DMA) showed that the loss factor (tan δ) of modified silicone rubber was greater than 0.3 in the temperature range of 81.5°C–250°C, which was higher than the loss temperature range of conventional damping rubber. The cyclic stress–strain test also showed that the modified silicone rubber still had high dissipation coefficient (DE) at high temperature. Therefore, the PBS-modified silicone rubber prepared by this method achieved excellent damping performance under high temperature conditions. 相似文献