Direct Grafting Reactions of Thermo-responsive (1→2)-Glucopyranan Derivatives Using a Sugar-based Cyclic Sulfite as Monomer

2018 ◽  
Vol 47 (11) ◽  
pp. 1375-1378 ◽  
Author(s):  
Sangeetha Srinivasa Shetty ◽  
Abu Bin Ihsan ◽  
Yasutomo Masugata ◽  
Yasuhito Koyama
Keyword(s):  
Cyclic Sulfite ◽  
Grafting Reactions

scholarly journals Radiation-Induced Asymmetric Grafting of Different Monomers into Base Films to Prepare Novel Bipolar Membranes

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2028
Author(s):  
Shin-ichi Sawada ◽  
Yasunari Maekawa
Keyword(s):  
Acrylic Acid ◽  
Anion Exchange ◽  
Graft Polymerization ◽  
The Other ◽  
Practical Applications ◽  
Bipolar Membranes ◽  
Graft Polymers ◽  
Grafting Reactions ◽  
Radiation Induced

We prepared novel bipolar membranes (BPMs) consisting of cation and anion exchange layers (CEL and AEL) using radiation-induced asymmetric graft polymerization (RIAGP). In this technique, graft polymers containing cation and anion exchange groups were introduced into a base film from each side. To create a clear CEL/AEL boundary, grafting reactions were performed from each surface side using two graft monomer solutions, which are immiscible in each other. Sodium p-styrenesulfonate (SSS) and acrylic acid (AA) in water were co-grafted from one side of the base ethylene-co-tetrafluoroethylene film, and chloromethyl styrene (CMS) in xylene was simultaneously grafted from the other side, and then the CMS units were quaternized to afford a BPM. The distinct SSS + AA- and CMS-grafted layers were formed owing to the immiscibility of hydrophilic SSS + AA and hydrophobic CMS monomer solutions. This is the first BPM with a clear CEL/AEL boundary prepared by RIAGP. However, in this BPM, the CEL was considerably thinner than the AEL, which may be a problem in practical applications. Then, by using different starting times of the first SSS+AA and second CMS grafting reactions, the CEL and AEL thicknesses was found to be controlled in RIAGP.

Flash grafting of functional random copolymers for surface neutralization

2014 ◽  
Vol 2 (25) ◽  
pp. 4909-4917 ◽  
Author(s):  
F. Ferrarese Lupi ◽  
T. J. Giammaria ◽  
G. Seguini ◽  
M. Ceresoli ◽  
M. Perego ◽  
...  
Keyword(s):  
Thermal Processing ◽  
Silicon Surface ◽  
Rapid Thermal Processing ◽  
Random Copolymer ◽  
Random Copolymers ◽  
Grafting Reactions

Rapid Thermal Processing (RTP) technology was employed to perform flash grafting reactions of a hydroxyl terminated poly(styrene-r-methylmethacrylate) random copolymer to a silicon surface.

Anticonvulsant sugar sulfamates. Potent cyclic sulfate and cyclic sulfite analogues of topiramate

1993 ◽  
Vol 3 (12) ◽  
pp. 2653-2656 ◽  
Author(s):  
Bruce E. Maryanoff ◽  
Michael J. Costanzo ◽  
Ricahrd P. Shank ◽  
James J. Schupsky ◽  
Marta E. Ortegon ◽  
...  
Keyword(s):  
Cyclic Sulfite

Effect of 172-nm UV irradiation on polyimide and its application in surface modification by grafting

2020 ◽  
Vol 32 (7) ◽  
pp. 761-774
Author(s):  
Lopamudra Das ◽  
John C Poutsma ◽  
Michael J Kelley
Keyword(s):  
Uv Irradiation ◽  
Photoelectron Spectroscopy ◽  
Secondary Ion Mass Spectrometry ◽  
Mechanical Stability ◽  
Uv Light ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Wide Range ◽  
Grafting Reactions ◽  
Sample Position

Polyimides (PIs) have a wide range of industrial and scientific applications due to their excellent thermal and mechanical stability and chemical resistance. Their response to ultraviolet (UV) irradiation is of further interest in high-value applications such as spacecraft technology and electronics packaging. In this work, we investigated the effect of 172-nm UV xenon excimer lamp irradiation on samples of pyromellitimido-oxydianiline (PMDA-ODA) commercial films in the absence of oxygen. The average irradiance received at the sample position was 90 mW/cm2, and the total radiation dosage varied from 0 to 64 J/cm2. X-Ray photoelectron spectroscopy, time-of-flight-secondary ion mass spectrometry, atomic force microscopy, and contact angle measurements were used to characterize the effect. Calculated UV-visible spectroscopy absorption spectra were obtained using the ZINDO//B3LYP/3-21G method to give an indication of which orbitals are involved in the transitions near 172 nm. The reactivity of the different UV-treated PI samples toward nitrogen-borne heptafluorodecene vapor was then investigated using the above techniques. Grafting reactions occurred on the surface of the photochemically activated polymer. This study explored the potential for modification of PI surfaces using UV-light-assisted grafting to impart valuable functionalities.

scholarly journals Grafting of Polypyrrole-3-carboxylic Acid to the Surface of Hexamethylene Diisocyanate-Functionalized Graphene Oxide

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1095 ◽  
Author(s):  
José Antonio Luceño-Sánchez ◽  
Ana Maria Díez-Pascual
Keyword(s):  
Graphene Oxide ◽  
Carboxylic Acid ◽  
Flexible Electronics ◽  
Mechanical Performance ◽  
Ester Group ◽  
Hexamethylene Diisocyanate ◽  
Acyl Chloride ◽  
Functionalized Graphene Oxide ◽  
Modified Graphene Oxide ◽  
Grafting Reactions

A polypyrrole-carboxylic acid derivative (PPy-COOH) was covalently anchored on the surface of hexamethylene diisocyanate (HDI)-modified graphene oxide (GO) following two different esterification approaches: activation of the carboxylic acids of the polymer by carbodiimide, and conversion of the carboxylic groups to acyl chloride. Microscopic observations revealed a decrease in HDI-GO layer thickness for the sample prepared via the first strategy, and the heterogeneous nature of the grafted samples. Infrared and Raman spectroscopies corroborated the grafting success, demonstrating the emergence of a peak associated with the ester group. The yield of the grafting reactions (31% and 42%) was roughly calculated from thermogravimetric analysis, and it was higher for the sample synthesized via formation of the acyl chloride-functionalized PPy. The grafted samples showed higher thermal stability (~30 and 40 °C in the second decomposition stage) and sheet resistance than PPy-COOH. They also exhibited superior stiffness and strength both at 25 and 100 °C, and the reinforcing efficiency was approximately maintained at high temperatures. Improved mechanical performance was attained for the sample with higher grafting yield. The developed method is a valuable approach to covalently attach conductive polymers onto graphenic nanomaterials for application in flexible electronics, fuel cells, solar cells, and supercapacitors.

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