配方优化改善轮胎胎冠变色

以在产轮胎胎面冠部胶配方为基本配方,对增塑体系、防护体系和硫化体系进行优化,以改善胎冠变色问题。结果表明,在胶料各项性能相当的前提下,适当降低配方中防老剂等易迁移小分子组分的用量可以大大减轻模具的污染,胎冠变色明显减弱。

手性纳米材料:生物成像、生物传感与治疗

手性无机纳米结构不仅形貌和结构可调控、易于表面功能化修饰,而且光学性质独特,在生物领域的应用上展现了很大的优异性.本文综述了近年来手性纳米技术在生物医学领域的研究进展,重点介绍了手性金属和手性半导体纳米结构的合成策略、圆二色效应、光手性机制及在生物成像、生物传感、肿瘤以及神经退行性疾病等医学领域的应用.手性纳米材料的研究丰富了生物化学的纳米技术手段,促进了肿瘤等重大疾病诊断与治疗技术的进步,推动了手性在生命科学中的发展,鼓励了研究者对这一新兴领域的持续探索与挑战.

不同牌号溶聚丁苯橡胶在轮胎胎面胶中的应用性能

研究3种牌号溶聚丁苯橡胶(SSBR)在轮胎胎面胶中的应用性能。结果表明:RC2557S胶料的门尼粘度最大,但流动性最好;RC2564S硫化胶的耐磨性能和抗湿滑性能最好,压缩温升最低;RC2557S,RC2564S和LG2550胶料的硫化特性、物理性能和滚动阻力相当,3种牌号SSBR在相同配方体系下可以实现相互替换。

BB430型密炼机混炼工艺的研究

试验研究BB430型密炼机混炼工艺对混炼效果的影响。结果表明,与传统混炼工艺相比,使用胶药炭同投或胶药炭油同投配以50~60 r·min^(-1)的高速混炼工艺混炼的胶料物理性能相当或较优,分散性和加工性能较高,同时生产效率提高20%~27%。

白炭黑分散剂FNS-22W在半钢子午线轮胎胎面胶中的应用

研究白炭黑分散剂FNS-22W在半钢子午线轮胎胎面胶中的应用。结果表明:在胎面胶中加入2或3份白炭黑分散剂FNS-22W,胶料的门尼粘度减小,门尼焦烧时间缩短,流动性提高;硫化胶的物理性能和抗湿滑性能变化不大,滚动阻力降低,且胶料加工成本下降。

Differential Antibacterial Effects of Chiral Co_(3)O_(4)

With the global spread of antimicrobial resistance,it is imperative to satisfy the need to develop novel antibacterial agents.Here,we synthesized chiral Co_(3)O_(4) nanoparticles (NPs) with obvious bactericidal effects.It was found that the circular dichroism (CD) spectra of L-Co_(3)O_(4) NPs and D-Co_(3)O_(4) NPs exhibited perfect mirror image inversion.Specifically,the survival rate of primary uterine fibroblast (PCS) cells reached above 90% by co-culturing with chiral Co_(3)O_(4) NPs.Besides,the chiral Co_(3)O_(4) NPs showed obvious killing ability on Gram-positive (Staphylococcus aureus);Gram-negative (Escherichia coli O157:H7) bacteria both in vitro and in vivo.Particularly,D-Co_(3)O_(4) NPs showed better antibacterial activity.Mechanistic studies confirmed that the level of reactive oxygen species level generated by D-Co_(3)O_(4) NPs was higher than that of L-Co_(3)O_(4) NPs.Overall,the synthesized D-Co_(3)O_(4) NPs have the potential to become a kind of novel antibacterial nanomaterials.