Bio-based polyurethane films using white dextrins

Several new eco-friendly materials have the potential to replace conventional petroleum-derived materials and monomers. Among them are natural polysaccharides. The use of polysaccharides in polyurethane (PU) synthesis has not yet been studied extensively, even though as multihydroxyl compounds, they can easily serve as crosslinkers in PU synthesis. One naturally occurring (hyper-)branched polymer is amylopectin, a component of starch. In this work, we report the PU synthesis and film-forming capacity using the asymmetric cyclic aliphatic diisocyanate—isophorone diisocyanate (IPDI) with acetylated and pristine partially hydrolyzed amylopectin/white dextrin (AVEDEX W80) as a crosslinker. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47454.     

文化心理结构与地理图式

认为存在着由地理环境因素生成的地域文化心理结构。由此提出地理图式的概念，并结合实例进行了较详尽的阐释。     

低温甲醇洗循环气压缩机选型及设计要点

介绍低温甲醇洗工艺中循环气压缩机的选型要点,并结合实践经验提出设计、制造中应关注的一些细节。     

论陶瓷色釉的运用

本文以色釉的特性在陶瓷中的运用所产生的艺术效果,并结合自己在创作中的体会来畅谈。     

Controlled morphology and optical properties of n-type porous silicon: effect of magnetic field and electrode-assisted LEF

Fabrication of photoluminescent n-type porous silicon (nPS), using electrode-assisted lateral electric field accompanied with a perpendicular magnetic field, is reported. The results have been compared with the porous structures fabricated by means of conventional anodization and electrode-assisted lateral electric field without magnetic field. The lateral electric field (LEF) applied across the silicon substrate leads to the formation of structural gradient in terms of density, dimension, and depth of the etched pores. Apart from the pore shape tunability, the simultaneous application of LEF and magnetic field (MF) contributes to a reduction of the dimension of the pores and promotes relatively more defined pore tips as well as a decreased side-branching in the pore walls of the macroporous structure. Additionally, when using magnetic field-assisted etching, within a certain range of LEF, an enhancement of the photoluminescence (PL) response was obtained.     

Improved conversion efficiency of amorphous Si solar cells using a mesoporous ZnO pattern

To provide a front transparent electrode for use in highly efficient hydrogenated amorphous silicon (a-Si:H) thin-film solar cells, porous flat layer and micro-patterns of zinc oxide (ZnO) nanoparticle (NP) layers were prepared through ultraviolet nanoimprint lithography (UV-NIL) and deposited on Al-doped ZnO (AZO) layers. Through this, it was found that a porous micro-pattern of ZnO NPs dispersed in resin can optimize the light-trapping pattern, with the efficiency of solar cells based on patterned or flat mesoporous ZnO layers increased by 27% and 12%, respectively.     

阳离子纤维改性剂的合成及应用

介绍了阳离子纤维改性剂的研究过程及其用途 ,用此方法合成的阳离子改性剂 ,性能优越 ,在纺织业有着广泛的应用     

气体和气体混合物的单参数状态方程

1 INTRODUCTIONThere are many equations of state that can be appliedto calculate pVT and thermodynamic properties forfluids.The simplest equation of state for gas is thefamous virial equations with the second coefficient B     

卢因三阶段理论在企业激励政策中的应用

通过对卢因三阶段理论主要内容的介绍,以及企业激励政策相关内容的阐述,提出化工企业在制定激励政策时,可将卢因三阶段变革理论加以应用,并在执行中不断调整,从而解决化工企业面临的实际问题。