Preparation and performance of a novel core-shell Gel Polymer Electrolytes
A novel core-shell latex Gel Polymer Electrolytes (GPE) based on poly (methyl methacrylate-acrylonitrile -styrene) (P(MMA-AN-ST)) was prepared for applications in Li-ion batteries. The structure and the performance of the polymer and the GPE were characterized with FTIR, DSC/TG, TEM, SEM, LSV and CA. It is shown that the copolymer has a high thermal stability up to 320°C and the porous structure of the membrane was formed effectively. As-prepared gel polymer electrolytes exhibits a high ionic conductivity of 3.52×10−3 Scm−1 at 25°C and it is electrochemically stable up to 5.2V (vs. Li). This novel GPE can be potentially applied to the manufacture of PLBs.
Polymer Electrolyte from Natural Rubber-Polyacrylic Acid and Polypyrrole and Its Application
A polymer host was prepared by admicellar polymerization of acrylic acid (AA) monomer coated on natural rubber (NR) to form a core-shell material (PAA-adp-NR). To form a polymer electrolyte, the electrical properties, including ionic conductivity and photovoltaic property, were measured to study the potential for use in the dye sensitized solar cells (DSSCs). PAA-adp-NR having the highest shell content (62%) showed the maximum ionic conductivity and energy conversion efficiency (η) at 1.86 mS cm-1 and 1.80%, respectively. The crosslinked structure of 62PAA-adp-NR provided η up to 1.99% (AA:N-methylene bisacrylamide (NMBA) at 500:1 mole ratio) and enhanced a long-term material stability. After oxidative polymerization with polypyrrole (PPy) on 62PAA-adp-NR, the conductivity increased up to 2.43 mS cm-1. In the case of crosslinked PAA-adp-NR/PPy, the conductivity and η showed the highest value at 5.48 mS cm-1 (AA:NMBA at 100:1 mole ratio) and 2.38% (AA:NMBA at 500:1 mole ratio), respectively.
A Study on Technology Embedded English Classes Using QR Codes
The development of information and technology has brought plenty of changes to the educational environment. The prevalence of smart phones is particularly playing a huge role in shaping learning methods. Smart phones provide the opportunity to scan QR codes, which can greatly ease access to information. Due to a high recognition speed, recognition rate, and restoration rate, they can be useful tools for English teachers to use in their class. In this study, we suggest using QR codes for writing and picture descriptions. Based on this study, more research should invest in Technology Embedded English teaching models to create better English classes for students.