摘要:

AbstractAcrylamide/maleic acid hydrogels in the form of rods were prepared by γ‐irradiating ternary mixtures of acrylamide–maleic acid–water with 2.00–5.71 kGy γ‐rays. The influence of dose and relative content of maleic acid on the spectroscopic, thermal and mechanical properties, swelling properties, diffusional behavior of water and diffusion coefficients of hydrogel systems are examined. Acrylamide/maleic acid hydrogels were swelled in the range of 1000–2800%, While polyacrylamide hydrogels were swelled in the range of 650–700%. Water diffusion to hydrogels in non‐Fickian type diffusion. The diffusion coefficients varied from 4.5 × 10−2to

ISSN:1042-7147    

DOI:10.1002/pat.1995.220061201

出版商:John Wiley&Sons, Ltd.    

年代:1995

数据来源: WILEY

摘要:

AbstractChitin–cellulose blends dissolved in dimethylacetamide containing LiCl (7% w/w) have been studied in a wide concentration range, from very dilute solutions to medium concentrations and up to solid films (absence of diluent).The intrinsic viscosities at various chitin–cellulose ratios, as well as the phase diagram behavior, imply a good compatibility between the components. The result is confirmed by the infrared measurements on solid films. The lack of anisotropic phase formation in chitin–diluent binary solutions and the anomalous trend of v′CH–CEline on the phase diagram are both interpreted on the basis of aggregation

ISSN:1042-7147    

DOI:10.1002/pat.1995.220061202

出版商:John Wiley&Sons, Ltd.    

年代:1995

数据来源: WILEY

摘要:

AbstractA bifunctional vinyl ether urethane derivative (BVU) was synthesized and characterzed. Photoresist systems consisting of BVU and a photoacid generator (PAG) along with various matrix polymers were prepared and the photoresist characteristics were evaluated. In the presence of BVU and a PAG, poly(methylmethacrylate‐co‐acrylic acid) and poly(methylmethacrylate) exhibited positive and negative tone behavior, respectively, where as poly(p‐hydroxystyrene) showed both positive and negative working properties depending on the prebake temperature of the system. The depandence of the photoresist behaviors on these matrix polymers was studied. The mechanism of the thermal and photochemical reactions was rev

ISSN:1042-7147    

DOI:10.1002/pat.1995.220061203

出版商:John Wiley&Sons, Ltd.    

年代:1995

数据来源: WILEY

摘要:

AbstractA series of push–pull chromophores (R‐HANB) based on 4′(N,N′‐dihydroxyethyl)amino‐4‐nitro azobenzene has been designed and synthesized. R‐HANB chromophores show a strong tendency to undergo intramolecular charge transfer and show high nonlinear optical effects. During the poling process, the trimer of hexamethylene diisocyanate reacted with R‐HANB to give four various thermosetting polyurethanes simultaneously at higher temperature. The second harmonic generations (SHG) of three crosslinked polyurethane films are fairly high and stable at ambient temperature. The real‐time measurement of SHG intensity vs. poling voltage indicates that orientation of chromophores is still feasible in this

ISSN:1042-7147    

DOI:10.1002/pat.1995.220061204

出版商:John Wiley&Sons, Ltd.    

年代:1995

数据来源: WILEY

ISSN:1042-7147    

DOI:10.1002/pat.1995.220061205

出版商:John Wiley&Sons, Ltd.    

年代:1995

数据来源: WILEY