聚氨酯/乙烯基酯树脂互穿聚合物网络阻尼性能的研究

采用二步法制备了聚氨酯／乙烯基酯树脂互穿聚合物网络,动态力学分析法研究了ＩＰＮ的阻尼性能。结果表明,聚氨酯／乙烯基酯树脂互穿聚合物网络出现宽温度阻尼范围。当聚氨酯／乙烯基酯树脂＝４０／６０时,材料的宽温度范围的阻尼性能最好。在体系中引入柔性链可改善低温阻尼性能,而引入刚性链则降低阻尼值、提高阻尼温度、阻尼温度范围变窄。在体系中引入大侧基能显著提高聚氨酯／乙烯基酯树脂互穿聚合物网络的阻尼性能,提高交     

胶乳型互穿聚合物网络(LIPN)阻尼材料

详细讨论了LIPN体系的阻尼原理。高分子材料在发生玻璃化转变时,大分子链段在玻璃化转变温度Tg附近的运动可以把振动能转化为热能耗散掉,借此可以达到减振、降噪的目的。这也是LIPN作为阻尼材料的依据。阻尼笥能是分子运动的结果,LIPN组分间的相容性及相互作用是影响阻尼性能的重要因素;采用不同的合成方法,将形成不同的微观形态,也会导致材料阻尼性能的差异。因此本文又深入探讨了各种合成参数及合成条件对体系性能的影响,并且指出了合成过程中特别需要注意的几个问题。     

CIIR/PMAc IPNs阻尼性能

CIIR/PMAc IPNs阻尼性能;氯化丁基橡胶; 互贯聚合物网络; 聚(甲基)丙烯酸酯; 阻尼性能     

均匀增粘剂在橡胶阻尼材料中的应用

本文对均匀增粘剂的作用机理和应用进行了研究。结果表明:均匀增粘剂可显著降低橡胶阻尼材料胶料的门尼粘度,改善混炼胶体系的混炼工艺、分散性和降低胶料相的尺寸,提高相态稳定性,优化了产品的表观质量,对橡胶阻尼材料的力学性能和阻尼性能影响不大。当用量为4份时,可达到加工性能和使用性能的最佳平衡。     

聚氨酯互穿聚合物网络阻尼性能研究进展

介绍了聚氨酯互穿聚合物网络（ＰＵ ＩＰＮ）作为阻尼材料的研究进展,分别讨论了聚氨酯（ＰＵ）／环氧树脂（ＥＰ）ＩＰＮ和ＰＵ／乙烯基聚合物ＩＰＮ的阻尼性,以及影响阻尼性能的因素,并比较了不同类型的ＰＵ ＩＰＮ的优缺点及新的可能的探讨方向。     

聚丙烯酸酯/聚苯乙烯乳胶互穿聚合物网络阻尼性能的研究

聚丙烯酸酯／聚苯乙烯乳胶互穿聚合物网络阻尼性能的研究刘瑞瑛王静媛韩庆国李玉玮汤心颐（吉林大学化学系长春１３００２３）关键词互穿聚合物网络，聚丙烯酸酯，聚苯乙烯，阻尼性能，乳胶自１９６９年Ｓｐｅｒｌｉｎｇ和Ｆｒｉｓｃｈ分别发展了ＭｉｌａｒＩＰＮ的...     

阻尼材料研究进展

对各种阻尼材料的研究进展进行了概述,内容涉及材料阻尼性能的评价方法,各种材料的阻尼机理及其影响因素,还简单介绍了先进的阻尼材料———智能阻尼材料及先进的阻尼技术———等离子真空沉积技术的研究概况。     

（甲基）丙烯酸酯及其共聚体系L′IPN的合成和性能研究Ⅱ．（甲基）丙烯酸酯及其共聚体系L′IPN的阻尼性能和力学性能

通过动态力学谱试验（ＤＭＳ）、应力－应变测量，研究了以丙烯腈、苯乙烯、醋酸乙烯酯等单体为共聚组分引入全（甲基）丙烯酸酯Ｌ′ＩＰＮ（胶乳型互穿聚合物网络）中对共混体系阻尼性能、力学性能的影响，发现通过无规共聚引进不同链结构能有效调节材料室温域的阻尼水平；初步探讨了ＩＰＮ（互穿聚合物网络）中某些组分侧链（基）结构对阻尼性能的影响规律及可能原因；本文所研究的ＩＰＮ体系在力学（物理）状态上处于皮革态，而交联密度、组分含量等对ＩＰＮ的力学性能具有较为复杂的影响。     

P(VA-co-DBM)/PVA乳胶IPN阻尼材料的合成及动态力学性能

用种子乳液聚合法合成了聚（醋酸乙烯酯－co-马来酸二丁酯）／聚醋酸乙烯酯乳胶互穿聚合物网络阻尼材料,动态力学谱结果表明,该阻尼材料在较宽的温域具有很高的阻尼因子。     

混合稀土对ZA27合金阻尼性能的影响

研究了ＺＡ２７合金的稀土变质机制及阻尼性能,利用悬臂梁测试了阻尼能力。结果表明,合金中加入Ａｌ－１０％ＲＥ中间合金可以细化组织和提高阻尼能力,稀土添加量为０．３％时有最佳的变质效果和最佳高的阻尼能力。     

Dichroism of absorption and polarization of phosphorescence of molecules of the closed form of nitrobenzospirothiopyran

The spectral-polarization characteristics of absorption and phosphorescence of molecules of the initial form of nitro-substituted indolinospirobenzothiopyran were studied in oriented polyethylene films and in solutions with different polarity. An oscillator model of the electron transitions responsible for the formation of absorption and luminescence spectra was suggested. It was established that the principal differences in the spectral and photophysical properties of the compound studied and its oxygen-containing analog are associated with the fact that the electronegativity of the S atom is lower than that of the O atom. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1143–1146, June, 1997.     

非那雄胺合成工艺改进

非那雄胺能抑制5α-还原酶的活性,明显降低二氢睾酮水平,是一种治疗良性前列腺增生的有效药品。该合成工艺以甾烯酮酸为原料,将其与氯化亚砜反应,无须分离即与叔丁胺反应得17β-酰胺化合物,再氧化开环,环合,氢化,脱氢合成了非那雄胺。经元素分析、IR、1HNMR、13CNMR、MS分析表征了其结构。该法无须使用昂贵的2,2-二吡啶二硫化物和剧毒药品苯亚硒酸酐,且以乙酸铵代替氨气,降低了对设备的要求和腐蚀,更适用于工业生产。     

Determination of heats of detonation and influence of components of composite explosives on heats of detonation of high explosives

The heats of detonation of 20 simple high explosives and explosive mixtures were determined by means of an adiabatic detonation calorimeter designed by the authors. The results indicated that the performance of the instrument was reliable and the experimental data were very accurate. For explosive mixtures, there was a linear accumulative relationship between the heats of detonation of the explosive mixture and its components. Accordingly, the heats of detonation of explosive mixtures could be calculated directly from the heats of detonation of simple explosives and the characteristic heats of other components. The experiments showed that the gold or brass shell of the cylindrical charge could be substituted by a thick-walled porcelain shell, which had the advantage of cheapness.

     

Synthesis of phenolic components of Grains of Paradise

Two vanilloids, (5E)-8-(4-hydroxy-3-methoxyphenyl)oct-5-en-4-one (1) and 4-[3-hydroxydecyl]-2-methoxyphenol (2), isolated from the dried seeds of Grains of Paradise (Aframomum melegueta), were synthesized; the latter compound was made as the S-enantiomer and the material derived from the seeds was found to be a 1:1.7 mixture of the R and S isomers. The synthetic route used should allow the preparation of analogs having extended alkyl chains and consequently different lipophilicity, and 3, a homolog of 2, was also prepared.     

Summary of development of the theory of stability of colloids and thin films

In this review, the research of the author in the field of colloidal systems is summarized. The factors influencing colloidal stability are systematized and analyzed. Examples are presented to illustrate the practical utilization of the theory of stability of colloids and thin films.This review was prepared on the basis of the works of the author, which were awarded the State Premium for 1991 in the field of science and technology, chemistry section.Institute of Physical Chemistry, Russian Academy of Sciences, 117915 Moscow. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 8, pp. 1708–1717, August, 1992.     

Study of hydration of two cements of different strengths

Main hydration products of two cement pastes, i.e. CSH-gel, portlandite (P) (and specific surface S) were studied by static heating, and by SEM, TEM and XRD, as a function of cement strength (C-33 and C-43) hydration time (th) and subsequent hydration in water vapour.Total change in mass on hydration and air drying, M_o, increased with strength of cement paste and with hydration time. Content of water escaping at 110 to 220°C, defined as water bound with low energy, mainly interlayer and hydrate water, was independent on cement strength but its content increased with (th). Content of chemically bound (zeolitic) water in CSH-gel, escaping at 220-400°C, was slightly dependent on strength and increased with (th). It was possibly derived from the dehydroxylation of CSH-gel and AFm phase. Portlandite water, escaping at 400-500°C, was independent on cement strength and was higher on longer hydration. Large P crystals were formed in the weaker cement paste C-33. Smaller crystals were formed in C-43 but they increased with (th). Carbonate formated on contact with air (calcite, vaterite and aragonite), decomposed in cement at 600-700^oC. It was high in pastes C-33(1 month) and C-43(1 month), i.e. 5.7 and 3.3%, respectively; it was less than 1% after 6 hydration months (low sensitivity to carbonation) in agreement with the XRD study showing carbonates in the air dry paste (1month), and its absence on prolonged hydration (6 months) and on acetone treatment. Water vapour treatment of (6 months) pastes or wetting-drying increased this sensitivity.Nanosized P-crystals, detected by TEM, could contribute to the cement strength; carbonate was observed on the rims of gel clusters.This revised version was published online in November 2005 with corrections to the Cover Date.     

氯氧化镁生成热的研究

用氧化镁氯化镁水溶液制备了8水合氯氧化镁[nMg(OH)2·MgCl2·8H2O], 并测定了其在盐酸中的溶解热, 实验结果表明, 氯氧化镁溶解热与n值呈线性关系, 根据溶解热求出5Mg(OH)2·MgCl2·8H2O和3Mg(OH)2·MgCl2·8H2O的生成热分别为-7727.1和5888.1kJ·mol^1^-。     

Thermodynamics of the formation of oxosulfides of rare-earth elements

The enthalpies of solution of several oxosulfides of rare-earth elements and the high-temperature enthalpies of oxosulfides and oxosulfates of lanthanum and yttrium were measured using solution calorimetry and high-temperature microcalorimetry techniques. Standard enthalpies of formation and some thermodynamic properties of oxosulfides and oxosulfates were calculated. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2 pp. 294–297, February, 1997.     

探究“铁的锈蚀条件”实验创新设计

设计了铁的锈蚀实验,说明了铁钉的处理方法,增加了温度、酸、碱的影响条件,实现了铁跟蒸馏水及空气中氧气快速反应而生锈,使实验在5 min左右就能够得到准确的结果。