Journal ArticleDOI
Phase separation and thermal degradation of poly(vinyl alcohol)/poly(methacrylic acid) and poly(vinyl alcohol)/poly(acrylic acid) systems by 13C c.p./m.a.s. n.m.r.
TLDR
In this article, phase separation and chemical structure changes occurring during thermal degradation were studied by high-resolution solid-state 13C n.m. spectra and 1H T1ϱ for samples subjected to various heat treatments.About:
This article is published in Polymer.The article was published on 1992-01-01. It has received 42 citations till now. The article focuses on the topics: Poly(methacrylic acid) & Vinyl alcohol.read more
Citations
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Facile preparation of 3D regenerated cellulose/graphene oxide composite aerogel with high-efficiency adsorption towards methylene blue.
TL;DR: This investigation provides the guidance for the development of green environmental adsorbents to remove organic dye from sewage water by showing the methylene blue elimination efficiency of RCE/GO aerogel reached 99.0% and still remained at 90.5% after five-time reused under oscillation adsorption.
Journal ArticleDOI
Polyvinyl Alcohol-Cellulose Nanofibrils-Graphene Oxide Hybrid Organic Aerogels
Alireza Javadi,Qifeng Zheng,Francois Payen,Abdolreza Javadi,Yasin Altin,Zhiyong Cai,Ronald Sabo,Shaoqin Gong +7 more
TL;DR: These environmentally friendly, biobased hybrid organic aerogels exhibited a series of desirable properties including a high specific compressive strength and compressive failure strain, ultralow density and thermal conductivity, good thermal stability, and moisture resistance, making them potentially useful for a broad range of applications including thermal insulation.
Journal ArticleDOI
pH-sensitive membranes from poly(vinyl alcohol)/poly(acrylic acid) interpenetrating networks
TL;DR: In this paper, the authors used an interpenetrating networks of poly(vinyl alcohol) and poly(acrylic acid) with varying degree of crosslinking and ionic content to determine the average molecular weight between crosslinks, crosslink density and mesh size.
Journal ArticleDOI
Thermal decomposition chemistry of starch studied by 13C high-resolution solid-state NMR spectroscopy
TL;DR: The chemical structure and thermal reaction pathway of four native and modified starch samples after being heated up to 600°C have been examined by 13 C high-resolution solid-state NMR spectroscopy as mentioned in this paper.
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Functionalized organic-inorganic nanostructured N-p-carboxy benzyl chitosan-silica-PVA hybrid polyelectrolyte complex as proton exchange membrane for DMFC applications.
Bijay P. Tripathi,Vinod K. Shahi +1 more
TL;DR: Developed PEMs were extensively characterized by studying their physicochemical and electrochemical properties under DMFC operating conditions and showed high stabilities and proton conductivity and low methanol permeability.
References
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Journal ArticleDOI
Resolution in 13C NMR of organic solids using high-power proton decoupling and magic-angle sample spinning
TL;DR: In this paper, the authors investigated important 13C line-broadening mechanisms in organic solids and their dependences on experimental parameters, notably static and rf magnetic field strength, and showed that no significant gain in resolution will be enjoyed at high magnetic fields, especially when variable-temperature operation is available.
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Setting the magic angle using a quadrupolar nuclide
James S. Frye,Gary E. Maciel +1 more
TL;DR: In particular, the 79Br signal from powdered KBr is especially convenient for monitoring the angle in 13C MAS experiments as discussed by the authors, and large crystals of KBr offer greater sensitivity to angle but are less convenient to use than powder.
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Thermal characterization of poly(acrylic acid)
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Thermal decomposition products of poly(vinyl alcohol)
Yoshio Tsuchiya,Kikuo Sumi +1 more
TL;DR: The thermal decomposition of polyvinyl alcohol is known to occur in two stages as mentioned in this paper, and the main products were water, aldehydes having the general formula and methyl ketones having the formula, where n = 0, 1, 2, 3, etc.