确定高圆簧两端串联橡胶弹簧系统横刚度的一种新方法

由高圆黄和橡胶簧中串联组成的机车辆悬系统为超静结构。将弹性杆理论应用     

匙座橡胶注射模设计

匙座橡胶注射模采用了夹持固定的方式，将金属零件牢固地固定在动模上，以完成在金属零件上注射橡胶的注射工艺过程。     

甲基乙烯基硅橡胶的化学交联及溶胶与凝胶分布的研究EI

研究了二甲基及乙烯基含量不同的甲基乙烯基硅橡胶的化学法交联的凝胶生成动力学及凝胶溶胶分配关系。在化学法交联过程中,溶胶平均分子量及单位交联剂量的交联度均是交联剂量的减函数。从溶胶与凝胶分配关系可知,二甲基硅橡胶的交联为无规过程,ln((1-S)/S]～Ⅰβ为线性关系,而甲基乙烯基硅橡胶的交联不能以无规过程来描述,ln[(1-S)/S]～Ⅰβ为非线性关系。     

橡胶硫化促进剂CBS的双氧水氧化法合成

以二巯基苯骈噻唑(促进剂M)、环己胺为原料,水作溶剂,在不使用强酸、强碱及其他催化剂的条件下,采用双氧水作氧化剂合成了N-环己基-2-苯骈噻唑次磺酰胺(CBS)。并通过正交实验对其合成工艺进行了优化。结果表明,CBS的最佳合成工艺条件为:n(促进剂M)/n(环己胺)为1.0∶3.0,n(促进剂M)/n(H2O2)为1.0∶1.9,n(环己胺)/n(溶剂水)为1∶55,反应温度为55℃;在此条件下,合成的CBS收率为95.28%,熔点为99.0℃,灰分为0.04%,挥发分为0.07%,其质量达到了国内企业行业标准HG 2096—91优级品指标。     

导电SBS/SBR复合材料的研究

本文研究了碳黑填充ＳＢＳ／ＳＢＲ复合材料的基本电性能，对复合材料电阻率随温度的变化特性进行了详细研究。讨论了碳黑种类、结构和性质、填充浓度以及ＳＢＳ含量对复合材料电阻率和电阻——温度特性的影响。实验结果指出，碳黑（Ｎ５５０）／ＳＢＳ／ＳＢＲ（ＳＢＳＳＢＲ＝１１ｗｔ）复合材料的电阻率随温度的变化呈一定强度的正温度系数（ＰＴＣ）效应。     

嵌段共聚聚丙烯抗冲击性能研究

通过研究乙烯含量、熔体流动速率（MFR）、橡胶含量、橡胶形态等因素和β成核剂对嵌段共聚聚丙烯（PPB）抗冲击性能的影响，发现PPB的抗冲击性能随着MFR的增大而显著下降；树脂中的乙烯含量、橡胶含量增加有利于提高抗冲击性能；橡胶与PP-PE基体互容成均相有利于提高PPB的抗冲击性能；β成核剂对提高PPB的抗冲击性能有一定效果。     

TM900×1800型橡胶托辊式摩擦传动球磨机的研制及应用

该机是以瑞典ＳＡＬＡ公司生产的ＳＲＲ型磨矿机为基础，结合我国设计球磨机的经验和我国国情而研制出的。该机可节省功率３２％，是一种全新概念的橡胶托辊式摩擦传动球磨机。     

Use of rice bran oil and epoxidized rice bran oil in carbon black–filled natural rubber–polychloroprene blends

In the present study we report the results obtained on the use of rice bran oil (RBO), a naturally occurring nontoxic oil, and its epoxidized variety (epoxidized RBO, or ERBO) in the compounding and vulcanization of different natural rubber–chloroprene rubber (NR–CR) blends. The processability, cure characteristics, and physical properties of the blends prepared with these oils were compared with those of control mixes prepared with aromatic oil. The optimum cure time and scorch time values of the different blends prepared with these oils were found to be lower than those of the respective control blends prepared with aromatic oil. Evaluation of physical properties of the different experimental blends showed that replacement of aromatic oil with these oils did not adversely affect their physical properties. Because RBO contains a good amount of free fatty acids it was tried as a coactivator in addition to its role as a processing aid. The level of these oils required for the blend preparation was optimized in a Brabender plasticorder. Physical properties such as tensile strength, elongation at break, tear strength, swelling index, and abrasion loss, for example, were evaluated for both experimental and control mixes. Comparison of cure characteristics and physical properties of the blends prepared with aromatic oil and with these oils showed that these oils could be used in place of aromatic oil in the above blends. It is also to be noted that aromatic oil is of petroleum origin and is reported to be carcinogenic. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 4084–4092, 2003     

Deformation mechanism of polystyrene toughened with sub‐micrometer monodisperse rubber particles

Core–shell polybutadiene‐graft‐polystyrene (PB‐g‐PS) rubber particles with different ratios of polybutadiene to polystyrene were prepared by emulsion polymerization through grafting styrene onto polybutadiene latex. The weight ratio of polybutadiene to polystyrene ranged from 50/50 to 90/10. These core‐shell rubber particles were then blended with polystyrene to prepare PS/PB‐g‐PS blends with a constant rubber content of 20 wt%. PB‐g‐PS particles with a lower PB/PS ratio (≤70/30) form a homogeneous dispersion in the polystyrene matrix, and the Izod notched impact strength of these blends is higher than that of commercial high‐impact polystyrene (HIPS). It is generally accepted that polystyrene can only be toughened effectively by 1–3 µm rubber particles through a toughening mechanism of multiple crazings. However, the experimental results show that polystyrene can actually be toughened by monodisperse sub‐micrometer rubber particles. Scanning electron micrographs of the fracture surface and stress‐whitening zone of blends with a PB/PS ratio of 70/30 in PB‐g‐PS copolymer reveal a novel toughening mechanism of modified polystyrene, which may be shear yielding of the matrix, promoted by cavitation. Subsequently, a compression‐induced activation method was explored to compare the PS/PB‐g‐PS blends with commercial HIPS, and the result show that the toughening mechanisms of the two samples are different. Copyright © 2006 Society of Chemical Industry     

New fabricate of styrene-butadiene rubber/montmorillonite nanocomposites by anionic polymerization

Styrene-butadiene rubber/montmorillonite (SBR/MMT) nanocomposites were successfully synthesized by in situ living anionic polymerization with n-BuLi as initiator. The results from kinetics study and ¹H NMR indicated that the addition of organophilic montmorillonite (OMMT) did not changed the living copolymerization and the components of the copolymer on the whole when OMMT content was lower than 3 wt %. However, gel permeation chromatography showed that the introduction of OMMT resulted in small amount of high-molecular weight fraction of SBR in the composites, leading to an increase in the weight-average molecular weight and polydispersity index, but the unchangeableness of the number-average molecular weight. The result from transmission electron microscopy and X-ray diffraction revealed that a completely exfoliated structure existed in the nanocomposite with 25 wt % styrene and OMMT content from 1 to 4 wt %, and styrene played an important role in the expanding of OMMT layers. Moreover, the nanocomposites possessed higher glass-transition temperature, thermal stability, tensile strength and elongation at break than SBR when the OMMT content ranged from 2.5 to 4 wt %. A schema was proposed to illustrate the formation of the nanocomposite and the exfoliation structure with physical cross-linking between SBR chains and OMMT.