基于SPOC理念的波谱化学翻转课堂教学设计

The SPOC course of spectroscopic methods in organic chemistry explored a combination of online and offline hybrid teaching methods based on the Chinese University MOOC network (https://www.icourse163.org/). Based on the characteristics of students at normal universities, the course was designed by improving teaching methods, designing course processes and contents, improving the contents of online video course, experiencing lessons and learning processes, and analyzing actual teaching results. The course aims to explore SPOC teaching rules, carry out teaching reforms, and provide more in-depth, meaningful, and effective teaching methods.     

阻燃聚丙烯共混体系结晶形态研究

本工作利用WAXD、DSC、PLM、PCM和SAIS等手段,对几种具有代表性的阻燃PP共混体系的结晶形态和结晶行为进行了研究。结果表明各种阻燃剂存在,对阻燃PP体系中PP的结晶形态和结晶行为有明显影响。其影响情况取决于这些阻燃剂自身的各种特性。另外,PP的结晶对某些阻燃剂的分散也有一定的影响,其结晶过程是体系中阻燃剂的一个再分散过程。     

Synthesis and Characterization of Small Band-gap Conjugated Polymers - Poly(pyrrolyl methines)

A kind of small band-gap conjugated polymers-poly (pyrrolyl methines) and their precursors-(poly pyrrolyl methanes) have been synthesized by a simple method and characterized by 1HNMR, FT-IR, TGA and UV-Vis. These polymers can be dissolved in high polar solvents such as DMSO, DMF or NMP. The results reveals that the band-gap of the synthesized conjugated polymers are in the range of 0.96～1.14 eV and they all belong to the small band-gap polymers. The conductivity of doped products with iodine is in the range of semiconductor.     

PVP改性氧化硅溶胶的微结构和流变性

以正硅酸乙酯为前驱体,聚乙烯吡咯烷酮（PVP）为聚合物改性添加剂,在碱性条件下制备氧化硅溶胶,通过小角X射线散射测量了改性溶胶的微结构参数,辅以动态光散射观测溶胶颗粒生长,研究了聚合物量、碱催化剂量和水量对溶胶颗粒度、分形特征以及流变性的影响规律.由于PVP链中强极性的分子内酰胺基团和氧化硅颗粒表面的羟基形成氢键,致使溶胶颗粒被聚合物链包裹,严重阻碍了溶胶颗粒的生长,使凝胶时间延长,流变性发生变化,同时对溶胶颗粒的微结构产生影响.     

Design a thieno[3,2-b]thiophene bridged nonfullerene acceptor to increase open-circuit voltage,short-circuit current-density and fill factor via the ternary strategy

In this study, we report a new small molecule acceptor (named TT-4F) which uses 3,6-dimethoxylthieno[3,2-b]thiophene (TT) as the π-bridge. Addition of 0.05 weight ratio amount of TT-4F into the host binary blend of PTB7-Th:IEICO-4F, resulting in a ternary blend in a weight ratio of 1:1:0.05, enables increased open-circuit voltage (V_oc), short-circuit current-density (J_sc), and fill-factor (FF) at the same time. Finally, 12.1% efficiency is obtained. Compared to the 3-(2-ethylhexyloxylthiophene) bridge on IEICO-4F, the additional methoxyl group on the TT-6 position is involved in the lowest unoccupied molecular orbital (LUMO) and the larger π-system on TT increases the electron-donating nature, both of which help to raise the LUMO level, one reason of the increased V_oc. Upon addition of 0.05 TT-4F, the hole mobility is increased, the monomolecular recombination is reduced, and the charge dissociation and collection is enhanced. All of these contribute to the increased J_sc and FF.     

Electrochemically controlled transport of small charged organic molecules across conducting polymer membranes

The transport of a range of functionalised sulfonated aromatics across conducting polypyrrole membranes has been considered. In the course of these studies several unique aspects of the chemical selectivity of these conducting materials have been identified. Using electrochemical quartz crystal microbalance (EQCM) the ion-exchange behaviour of these membranes was investigated to further elucidate the transport mechanism.     

Weighted Norm Inequalities for Marcinkiewicz Integrals with Non-Smooth Kernels on Spaces of Homogeneous Type

In this article, we obtain some weighted estimates for Marcinkiewicz integrals with non-smooth kernels on spaces of homogeneous type. The weight $\omega$ considered here belongs to the Muckenhoupt’s class $A_∞.$ Moreover, weighted estimates for commutators of BMO functions and Marcinkiewicz integrals are also given.     

Hardy factorization in terms of fractional commutators in Lorentz spaces

We provide a constructive proof of H^1\left({\text{ℝ}}^d\right) (the classical Hardy space) factorization in terms of fractional commutators in Lorentz spaces. As a direct application, we obtain a characterization of functions in BMO space. Furthermore, we also obtain a Lorentz compactness characterization of fractional commutators.     

Calorimetry on small systems—a thermodynamic contribution

Another thermodynamic approach to the Gibbs-Thomson equation, starting from an incremental composition of enthalpy and entropy of the chain molecule, is presented. This describes the melting temperature of (lamella) crystals of linear, folded and cyclic alkanes as well as polyethylenes (PEs) of different type with only one set of parameters. The essential variable turns out to be the number of repeat units (r.u.) (“beads”) of the respective molecule, incorporated into the crystallite, rather than the crystallite size. The finding supports the melting being a dynamic process which starts at the surface (interface) of the crystallite. The approach helps to understand the melting behavior of semi-crystalline polymers, it enables the cyclic and normal alkanes to serve as model substances for polymer crystals although their crystals are nearly perfect and large by contrast to the situation in semi-crystalline polymers.