可见光引发剂研究进展

光固化技术的应用非常广泛，常用于光固化涂料、油墨、牙科固化、胶粘剂以及 3D打印材料等领域。与紫外光固化相比，可见光固化具备辐射安全、固化深度高、设备价格低廉等优势。作为光固化体系的重要组成部分，光引发剂的研究一直备受关注。本文对近 2~3 a可见光引发剂的研究进展进行了综述，主要从 TPO类、萘酰亚胺类、蒽醌类、咔唑类、硅酮类、肟酯类、共轭染料类、光生酸剂类和金属配合物类光引发剂 9个方面进行了综述，并对可见光引发剂的发展方向做了简单的概述。     

动态交联热塑性弹性体增韧聚丙烯合金

用动态交联方法制备聚烯烃热塑性弹性体（ＴＰＯ）增韧聚丙烯，制备了具有低温冲击性能良好、综合力学性能比较均衡的聚丙烯合金。同时，研究了ＴＰＯ组成、工艺及基体组成与ＴＰＯ增韧聚丙烯共混物力学性能的关系。并通过差热扫描量热计和扫描电镜考察了共混物的形态结构。     

Investigation of CH4 Reforming with CO2 on Meso-Porous Al2O3-Supported Ni Catalyst

Meso-porous Al₂O₃-supported Ni catalysts exhibited the highest activity, stability and excellent coke-resistance ability for CH₄ reforming with CO₂ among several oxide-supported Ni catalysts (meso-porous Al₂O₃ (Yas1-2, Yas3-8), -Al₂O₃, -Al₂O₃, SiO₂, MgO, La₂O₃, CeO₂ and ZrO₂). The properties of deposited carbons depended on the properties of the supports, and on the meso-porous Al₂O₃-supported Ni catalyst, only the intermediate carbon of the reforming reaction formed. XRD and H₂-TPR analysis found that mainly spinel NiAl₂O₄ formed in meso-porous Al₂O₃ and -Al₂O₃-supported catalysts, while only NiO was detected in -Al₂O₃, SiO₂, CeO₂, La₂O₃ and ZrO₂ supports. The strong interaction between Ni and meso-porous Al₂O₃ improved the dispersion of Ni, retarded its sintering and improved the activated adsorption of CO₂. The coking reaction via CH₄ temperature-programed decomposition indicated that meso-porous Al₂O₃-supported Ni catalysts were less active for carbon formation by CH₄ decomposition than Ni/-Al₂O₃ and Ni/-Al₂O₃.     

Comments on the characterisation of oxidation catalysts using TPR/TPO

Temperature programmed reduction (TPR) and oxidation (TPO) are used extensively in catalyst characterisation. In this paper, we examine the use of TPR/TPO cycles for the characterisation of a range of molybdates and single oxides. In particular we observe that the first cycle differs from that of subsequent analyses, even when the maximum temperature is limited to that used in the catalytic reaction. The effect is independent of heating rates and cooling atmospheres and has been demonstrated using different bed configurations. This observation has significance when these oxides are used in periodic flow reactors that involve many cyclical reduction/oxidation.     

基于CAN总线的道路照明控制系统设计与实现

传统城市道路照明系统对回路实现整体控制,只能实现回路路灯整体开关,不能对回路中的单个路灯进行单点控制,且灵活性差.为实现路灯节能降耗,提出了一种基于CAN总线的道路照明控制系统的设计与实现方法,采用智能化控制策略对传统路灯照明系统进行改进,使用英飞凌16位单片机对车辆通过信息进行采集和处理,预先调整路灯亮度.论述了系统...     

耐根穿刺TPO防水卷材干铺法施工技术研究

种植屋面技术难点在于屋面结构层与功能层的耐根系穿刺能力,而本文即对耐根穿刺型TPO防水卷材的施工技术作为研究对象,简要介绍了该材料在屋面应用中干铺法施工技术实施的方法,并结合施工质量得出相应的保证措施。     

Methane Combustion and TPR/TPO Properties of Pd/CexZr1-xO2/Al2O3 Catalysts

Methane Combustion and TPR/TPO Properties of Pd/Ce_xZr_ 1-xO_2/Al_2O_3 Catalysts     

Supported Rh catalysts for the indirect partial oxidation of isooctane

The production of hydrogen from isooctane over three rhodium-based catalysts has been examined. The reaction entailed total oxidation of a proportion of the fuel followed by reforming of isooctane to produce hydrogen. Rhodium (1% wt) was impregnated on three different supports: alumina, ceria-alumina, and ceria-zirconia. No differences in catalytic activity were observed, but reaction yield changed with the support. Ceria-zirconia was found to be the preferred support since methanation did not occur over the catalyst.     

Quantitative probing the interfacial structure of TPO/CPO blends by transmission electron microscopy via EDX

High-resolution scanning transmission electron microscope (HR STEM) measurements were performed on a thermoplastic polyolefin (TPO) substrate coated with chlorinated polyolefin (CPO). This CPO was a maleated chlorinated polypropylene containing 21.8 wt% Cl. The TPO investigated was a blend of high-modulus isotactic polypropylene (iPP) with a crystalline ethylene-butene copolymer (EB9) containing 9 wt% butene. For these injection-molded samples, examined ca. 10 mm from the mold gate, a stratified morphology found at TPO surface consisting of thin fibers of EB9 trapped in a transcrystalline iPP matrix, with crystalline lamellae propagating from the matrix across the EB9 domains. This structure was unperturbed when the plaques were coated (from tetrahydrofuran solution) with a 5 μm layer of CPO, but underwent changes of increasing severity when subjected either to a dry bake at 120 °C or annealing at 120 °C in the presence of xylene vapor. The interfacial structure between the CPO and the TPO was probed by TEM with energy dispersive X-ray imaging (EDX). The elemental chlorine across the interface gave good fits to a tan h function, and the interface thickness increased from 23 ± 2 nm to 28 ± 1 nm upon annealing at 120 °C for 30 min. After annealing in the presence of xylene vapor, this value increased to 50 ± 4 nm. As reference points, we determined an interface thickness of 29 ± 3 nm for the CPO-EB interface and 15 ± 2 nm for the interface between CPO and iPP.     

Effect of Cooling Press on the Optical Transmission Through Photovoltaic Encapsulants

In certain laminators for poly (ethylene-co-vinyl acetate) (EVA) encapsulation process of photovoltaic modules, cooling press (CP) is applied to the module after encapsulation. Here, the effect of CP on the optical transmission through common PV encapsulants is studied. Interestingly, CP is shown to reduce drastically the scattering of the light between 400 and 700 nm traveling through the thermoplastic polyolefin (TPO)-based encapsulant. Post-annealing tests prove this effect to be stable at the temperature up to 85°C. This work has discovered a simple solution to mitigate the milky appearance of the TPO encapsulant and hence greatly enhanced its competitiveness against EVA.