聚合配方及原料对乳聚丁苯橡胶定伸性能的影响研究

简要地论述了在乳聚丁苯橡胶(ESBR)生产过程中,丁二烯及苯乙烯单体配比、相对分子质量调节剂用量、聚合转化率以及乳化剂质量对产品300%定伸应力的影响。结果表明,在产品指标控制范围内,其硫化胶的300%(25min)定伸应力随着结合苯乙烯含量的增加而稍有增大,随着聚合过程中相对分子质量调节剂用量增加而下降。同时实验表明,聚合过程中使用的乳化剂质量,对产品的300%(25min)定伸应力具有重要影响。     

垂直轴5叶片阻力型风力机的动态特性

采用CFD对风轮直径为4 m的垂直轴5叶片阻力型风力机的瞬态流场进行数值模拟. 通过对不同入口风速和风力机转速条件下风力机流场和力矩系数随时间的变化情况的计算模拟,分析了垂直轴5叶片阻力型风力机的动态特性. 结果表明,流场和力矩系数的变化具有周期性,随转速增加,力矩系数的均值和周期均减小,振荡幅度增大;随风速增加,力矩系数均值和振荡幅度均大幅上涨. 力矩系数呈调制波形式,风速对曲线形态有较大影响. 随风速增大,风力机的最佳转速和风能利用率逐渐增加. 当入口风速从7.5 m/s增加到9 m/s时,风力机的最佳转速和风力机的风能利用率最大值分别从13 r/min和23.2%增加到19 r/min和25.8%.     

N‐Bromosuccinimide‐Mediated Radical Cyclization of 3‐Arylallyl Azides: Synthesis of 3‐Substituted Quinolines

Visible light irradiation of N‐bromosuccinimide serves as an effective means to convert methyl 2‐(azidomethyl)‐3‐arylpropenoates and 2‐(azidomethyl)‐3‐arylacrylonitriles to the corresponding iminyl radicals via α‐hydrogen abstraction and subsequent extrusion of dinitrogen. Thus formed iminyl radicals then undergo intramolecular ortho attack on the aryl ring, affording methyl quinoline‐3‐carboxylates and quinoline‐3‐carbonitriles respectively.

     

18.4-26-12PR R-4A工业用农业轮胎的设计

介绍了18.4-26-12PR R-4A工业用农业轮胎设计的结构设计和施工设计情况。结构设计： 断面宽 425mn,外直径1430mm;行驶面宽度385mm,弧度高45mm;胎圈着合直径662mm,胎圈着合宽度390mm;断面水平轴位置(H1／H2) 为0.67;花纹采用R-4A型设计,花纹深度28.5mm,花纹饱和度33%。施工设计：胎面采用两方三块结构;胎体采用6层1400dtex／2锦纶6浸胶帘布,胎冠角55.9°,胎体安全倍数达9.2;钢丝圈为单钢圈,采用直径1.0mm的19#回火钢丝,排列方式为10×10,安全倍数达9.0;采用半鼓轮式成型鼓成型,罐式硫化。成品轮胎试验结果表明,轮胎充气外缘尺寸、物理性能、帘线性能和市场检验均符合相应标准要求。     

氯化铵催化合成烯胺酮化合物

以氯化铵为催化剂,在室温下催化伯胺与β-二酮反应,合成标题化合物。该方法收率高、处理方法简单、反应条件温和、环境友好、催化剂可回收,符合绿色化学要求。     

蔗渣硫酸盐浆漆酶/介体生物漂白流程与工艺的研究

进行了蔗渣硫酸盐浆漆酶 /介体 (LMS)生物漂白流程与工艺的研究。讨论了漆酶的存在和纯化、表面活性剂对LMS的影响 ,分析了碱抽提、螯合处理、酸处理以及压力过氧化氢漂白对漂白结果的影响。检测了含LMS处理的纸浆漂白流程的纸浆性质     

An anionic framework aluminophosphate |(CH2)6N4H3·H2O|[Al11P12O48] and computer simulation of the template positions

A new aluminophosphate compound |(CH₂)₆N₄H₃·H₂O|[Al₁₁P₁₂O₄₈] (denoted AlPO-CJB2) with a three-dimensional open framework and an Al/P ratio of 11/12 has been synthesized solvothermally by using hexamethylenetetramine as a template. It was characterized by X-ray powder diffraction, inductively coupled plasma, elemental (CHN), and thermogravimetric analyses, and the structure was determined by single-crystal X-ray diffraction analysis. AlPO-CJB2 crystallizes in the trigonal space group R-3c with a=14.088(2) Å, c=42.199(9) Å, and Z=6. Its structure features two new kinds of cages, i.e., cage 1, 4¹²4³6⁶8⁶ and cage 2, 4¹²6¹². The two cages alternate along the [0 0 1] direction forming an infinite column by sharing a common snowflake-like chiral motif, which is constructed from an AlO₆-centered six four-membered rings. The title compound is constructed from strictly alternating Al polyhedra (AlO₄ and AlO₆) and P tetrahedra (PO₄) via bridging oxygen atoms, and presents a new type of stoichiometry with an Al/P ratio of 11/12 in the aluminophosphate family. Computer simulation was used to determine the possible positions of the organic template within the cages.     

预处理短纤维对VMQ/EPDM共混导电橡胶某些性能的影响

研究了预处理短纤维用量对乙炔炭黑填充甲基乙烯基硅橡胶（ＶＭＱ）／ＥＰＤＭ共混硫化胶拉伸、撕裂、耐屈挠疲劳和导电性能的影响。实验结果表明，加入适量短纤维对ＶＭＱ／ＥＰＤＭ体系有一定的补强作用；纤维用量较大时，导电性能下降。加入４．０份左右的预处理短纤维，可使ＶＭＱ／ＥＰＤＭ共混导电橡胶获得良好的物理机械性能和导电性能