集成橡胶SIBR臭氧老化过程的研究

本文跟踪考察了集成橡胶SIBR的臭氧老化过程,并对老化过程中微观结构及其样品表面臭氧龟裂的变化规律进行了研究。结果表明：在臭氧老化过程中SIBR分子链中双键含量减少,并且伴有羰基结构的产生。双键和羰基结构的变化趋势与丁苯橡胶SBR相似,老化后期均趋于平缓。未填充和填充SIBR产生臭氧龟裂的初裂时间均居于丁苯橡胶SBR和异戊橡胶IR之间,但是发生初裂之后,未填充和填充SIBR表面裂纹的增长速度均较慢。经臭氧老化后,SIBR的力学性能变化率均较低,由此说明,SIBR的耐臭氧老化性能优于SBR和IR。     

促进剂ZDTP及ZDTP/ZMBT并用对天然胶乳性能影响的研究

烷基二硫代磷酸锌(ZDTP)属无亚硝胺硫化促进剂,具有优越的抗硫化返原性,与橡胶相容性好且不易喷霜,有很好的应用前景。本文采用硫磺硫化体系,研究了促进剂ZDTP及ZDTP/2-硫醇基苯并噻唑锌(ZMBT)并用对配合天然胶乳的粘度、热稳定度、机械稳定度及配合胶乳胶膜硫化硫化特性、硫化胶膜力学性能的影响。试验结果表明：1.促进剂ZDTP对配合胶乳的胶体性能及贮存性能有较大影响,其所制备的配合胶乳的粘度大、热稳定度和机械稳定度低,随贮存时间的延长,配合胶乳的粘度增加较快,机械稳定度显著降低;促进剂ZDTP单用对配合胶膜硫化促进作用较小,硫化胶膜的硫化程度低,其拉伸强度等力学性能较小; 2.促进剂ZDTP/ZMBT并用比对配合胶乳的胶体性能影响较大,随ZDTP/ZMBT中ZDTP比例的增加,胶乳的粘度逐渐增大,热稳定度逐渐减小,当促进剂用量为1.5份时,机械稳定度在ZDTP/ZMBT并用比为0.75:0.75时最大;贮存时间对促进剂ZDTP/ZMBT并用制得的配合胶乳的胶体性能影响较小,随贮存时间的延长,配合胶乳的粘度、热稳定度和机械稳定度变化均较小;促进剂ZDTP/ZMBT并用对配合胶膜有较大的硫化促进作用,配合胶膜硫化速度较快,其所制备的硫化胶膜的交联密度高,其拉伸强度较高,ZDTP与ZMBT具有很好的协同作用。     

21.00－35 40PR港口工程机械轮胎的设计

介绍21.00-35 40PR港口工程机械轮胎的设计。结构设计:外直径2 005 mm,断面宽510 mm,行驶面宽度475 mm,行驶面弧度高45 mm,胎圈着合直径885 mm,胎圈着合宽度405 mm,断面水平轴位置(H_1/H_2)0.931 0,花纹深度38 mm,花纹周节数30,花纹饱和度78%。施工设计:胎面采用3种配方,胎面冠部胶采用缠绕成型,胎体帘布和缓冲层帘布分别采用20层2100dtex/2V_1和2层930dtex/2V_3锦纶66帘布,成型采用838.2~889 mm(33~35英寸)成型机成型,单模硫化机硫化。成品轮胎室内试验结果表明,轮胎充气外缘尺寸和物理性能均达到设计和相应标准要求。     

Novel flexible electrically conductive adhesives from functional epoxy,flexibilizers, micro‐silver flakes and nano‐silver spheres for electronic packaging

In this study, five different flexibilizers were added into a matrix resin to improve the flexibility of electrically conductive adhesives (ECAs). The flexible ECAs were fabricated from the matrix resin and electrically conductive fillers. Their curing was fixed at 150 °C for 30 min. Of the five flexibilizers, 1,3‐propanediol bis(4‐aminobenzoate) (PBA) had the best effect on the electrical, mechanical and thermal properties of the ECAs. During curing, PBA reacted with the functional epoxy in the matrix resin. The soft ether segments in PBA were grafted into the crosslinked epoxy network to form an orderly spaced mesh structure. This led to high‐temperature stability, with the pyrolysis temperature being above 350 °C. Flexible ECAs with a 10% weight ratio of PBA in the matrix resin had the best properties. Their viscosity and bulk resistivity were the lowest. Their flexibility and electrical conductivity were the highest. They also had low storage modulus which could effectively dissipate or reduce the residual shear stress generated by the mismatch of thermal expansion coefficient between chip and substrate. Their impact strength was the lowest, and the toughening effect was so significant that the improvement was about 48% compared to ECAs. © 2013 Society of Chemical Industry     

Formation of formic acid from glycerine using a hydrothermal reaction

BACKGROUND: Glycerine, a main by‐product of the biodiesel manufacturing process, has potential to be an important biorefinery feedstock with the rapid increase in biodiesel production all over the world. Hydrothermal experiments with glycerine were carried out at 250 °C using H₂O₂ as an oxidant. RESULTS: Glycerine was converted into formic acid with a yield of 31.0% based on the starting mass of carbon in glycerine. A possible oxidation pathway for the formation of formic acid from glycerine is proposed. In the proposed pathway, glycerine may first be oxidised and then decomposed into formic acid and oxalic acid. Oxalic acid was indirectly attributed to the increase of formic acid production from glycerine, but it instead acts as a retardant to prevent further oxidation of formic acid. However, when an alkali was added to the experimental conditions, the yield of formic acid was not greatly improved, reaching only 34.7%. CONCLUSION: The present work should help to facilitate further studies to develop a new green process for the production of formic acid from renewable biomass. © 2012 Society of Chemical Industry     

多形貌周期性介孔有机硅的合成和表征

采用低温水热合成法,通过改变2种硅源物质的量比合成了一系列周期性介孔有机硅(PMOs)。通过XRD、TEM、SEM和N吸附-脱附物理吸附仪等方法对其结构进行了2表征。结果表明,通过改变硅源1,2-双-三乙氧基硅基乙烷(BTESE)的物质的量比,可获得宏观形貌从六面体变化到纳米空心小球的一系列PMOs。当物质的量比为0.2和1时,可以制备出具有六面体和空心小球宏观形貌的PMOs。     

石墨炉原子吸收光谱法检测烟用接嘴胶中铬的含量

为了建立石墨炉原子吸收光谱法检测烟用接嘴胶中铬含量的方法,研究了待测接嘴胶的用量、灰化温度、原子化温度及基体改进剂对检测的影响.确定的优化检测条件为：烟用接嘴胶用量为0.3000 9,铬的灰化温度、原子化温度、基体改进剂分别为800℃,2300℃和1.00 g/L氯化钯.在优选的实验条件下检出限分别为0.245 μg/kg,相对标准偏差分别为1.26％,回收率范围分别在93.8～106.8％之间.本方法检出限低,重复性好,回收率高,简单方便.     

Au/Fe3O4纳米复合材料的制备及其催化性能

通过将金纳米粒子铆接到Fe3O4载体表面,制得了Au/Fe3O4纳米复合粒子。首先以对苯二酚为还原剂还原HAuCl4制得球形金纳米粒子;然后采用溶剂热法制备Fe3O4磁性纳米颗粒,并用巯基丙酸(MPA)对其修饰;最后通过MPA与金纳米粒子之间的相互作用,将金纳米颗粒固定到Fe3O4表面。采用透射电子显微镜(TEM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)和振动样品磁强计(VSM)和紫外-可见分光光度计(UV-vis)对所制备材料进行形貌、晶型、磁性和催化性能的表征。结果表明,金纳米颗粒成功包覆在Fe3O4表面,所得到的Au/Fe3O4复合纳米材料具有单分散性和超顺磁性,并且对NaBH4还原对硝基苯酚(4-NP)制备对氨基苯酚(4-AP)的反应显示出优良的催化性能。     

新能源在轮胎企业的应用

简单介绍新能源的类型和特点,主要阐述太阳能在轮胎企业的应用,并对其经济效益和社会效益进行了分析。新能源主要包括太阳能、地热能、生物质能以及风力、天然气水合物等其他清洁能源。利用价值最高的太阳能利用技术就是太阳能集热板。在轮胎企业,太阳能的应用主要体现在用集热板加热循环介质,通过热交换完成太阳能的利用。分析认为,轮胎企业使用太阳能的节能效果显著,发展前景广阔。     

动态场景中运动物体搜寻与跟踪算法及系统研究

本论文旨在研究一套自动对动态影像中正在运动的物体进行自动搜索和分割,并对该物体运动轨迹进行追踪和记录的方法。