Results 21 to 30 of about 90,342 (264)
Polyvinyl Alcohol Obtained From Hydrolysis of Polyvinyl Trifluoroacetate
Kobunshi Kagaku, 1959 ポリ三フッ化酢酸ビニル塊状重合物を, BPOを開始剤として合成し, 種々の方法でケン化してポリビニルアルコール (PVA) を得た。これらのPVAは95～115℃で水に可溶であるが, 水溶液は室温で不安定で, 濃度1～5%において, 試料により, ゲル化 (可逆性) や, ゆるい流動を与えたとき不溶物が生成するなどの挙動を示す。90℃で行なった粘度測定で が得られ, 過ヨウ素酸消費量から定量した1, 2グライコール結合含有量は, 0.105%であった。
Ito, Taisuke +2 more
openaire +2 more sources
Advanced Functional Materials, EarlyView.Molecular rotors are fluorescent molecules that are sensitive to viscosity and temperature variations in the environment. They exhibit a direct correlation between fluorescence and viscosity within Newtonian fluids. However, this correlation becomes less straightforward in complex systems.
Flavia Di Scala +6 more
wiley +1 more source
Molecular Weight Distribution of Polyvinyl Acetate and Polyvinyl Chloride
The Journal of the Society of Chemical Industry, Japan, 1967 市販ポリ酢酸ビニル,市販ポリ塩化ビニルおよび低温重合ポリ塩化ビニルの分子量分布を,ゲル・パーミエイションクロマトグラフィーとカラム分別で検討した。ポリ酢酸ビニル(粒状重合体,重合度1500)については,メチルエチルケトン-n-ヘキサン系でのカラム分別(40℃)の結果とGPCのそれとはよく一致した。また,溶液重合でえられた重合度700,1200,2000のものの重合度分布をGPCで検討した結果,重合度の高いものほど分布が広かった。一方,ポリ塩化ビニル(懸濁重合体,重合度1500)については,種々な条件でカラム分別を行なった結果,ポリマーを選択的に付着させ,かつ高温のシクロヘキサノン-エチレングリコール系での結果がGPCとほぼ一致した。また,重合度800,1000 ...
Saburoe YAMADA +3 more
openaire +2 more sources
Advanced Functional Materials, EarlyView.A magnetically assisted snap‐through liquid crystal elastomer transforms photochemical deformation into a high‐power mechanical impulse, enabling remote microneedle actuation and highlighting its potential for future smart livestock intervention systems.
Chae Won Lee +3 more
wiley +1 more source
Architecting highly hydratable polymer networks to tune the water state for solar water purification
Science Advances, 2019 Highly hydratable light-absorbing hydrogels with reduced water vaporization energy promote efficient solar water purification. Water purification by solar distillation is a promising technology to produce fresh water.
Xingyi Zhou +4 more
semanticscholar +1 more source
Designing Dendrite‐Free Zinc Anodes for Advanced Aqueous Zinc Batteries
Advanced Functional Materials, 2020 Zn metal has been regarded as the most promising anode for aqueous batteries due to its high capacity, low cost, and environmental benignity. Zn anode still suffers, however, from low Coulombic efficiency due to the side reactions and dendrite growth in ...
Junnan Hao +8 more
semanticscholar +1 more source
Advanced Healthcare Materials, EarlyView.We introduce a new fabrication method that overcomes the current limitation of tubular gap electrospinning. We successfully fabricated a seamless hollow tube with fibers aligned along the longitudinal axis in diameters as small as 300 µm, and then reinforced it using 4‐axis 3D printing.
Seyed Aliakbar Hosseini Toopghara +9 more
wiley +1 more source
Infrared Analysis of Polyvinyl Chloride-Polyvinyl Acetate Copolymer
The Journal of the Society of Chemical Industry, Japan, 1965 PVC-PVAc共重合物についてフィルム法,KBr錠剤法により共重合度の迅速定量法および状態分析の研究を行なった。状態分析としては, >CH2 の伸縮振動2913cm-1に対するPVCの1099cm-1の強度比が共重合と共に増大すること,およびPVCのアイソタクチックな非晶性バンドといわれる690cm-1の2913cm-1に対する強度比が共重合と共に減少するが,減少割合が混合物の場合に比して少ないことから,共重合物と混合物との識別が可能であることを見出した。更に前者の事実からPVCの1099cm-1の吸収は従来結晶化度と関係がないように思われているが,この吸収はむしろ非晶性バンドと考えられる。共重合度の定量法としては>CH2 の変角振動1425cm-1と>C=Oの伸縮振動1744cm-1 ...
Tsugio TAKEUCHI, Sadao MORI
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Transient Charging of Mixed Ionic‐Electronic Conductors by Anomalous Diffusion
Advanced Materials, EarlyView.This article explores charge transport in mixed ionic‐electronic conductors (MIECs) through electrochemical impedance spectroscopy and transient current analysis. Focusing on PEDOT:PSS, WO3, and n‐doped PBDF, it uncovers the impact of anomalous diffusion via fractional modeling. The study reveals key correlations that deepen understanding and guide the
Heyi Zhang +9 more
wiley +1 more source
Science of the Total Environment, 2019 The ecological stress of microplastics (MPs) contamination in agroecosystems raise worldwide concerns. However very few studies concentrated on the effects of MPs exposure on soil microbial community. The alterations of enzymatic activities and bacterial
Y. Fei +8 more
semanticscholar +1 more source