Synthesis of a new hyperbranched-linear-hyperbranched triblock copolymer and its use as a chemical modifier for the cationic photo and thermal curing of epoxy resins

2011 ◽  
Vol 50 (6) ◽  
pp. 1133-1142 ◽  
Author(s):  
D. Foix ◽  
X. Ramis ◽  
M. Sangermano ◽  
A. Serra
Keyword(s):  
Epoxy Resins ◽  
Triblock Copolymer ◽  
Chemical Modifier ◽  
Thermal Curing

Use of LR white embedding medium for routine transmission electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 624-625
Author(s):  
Judith A. Murphy ◽  
Robert L. Price
Keyword(s):  
Epoxy Resins ◽  
Thermal Curing ◽  
Low Viscosity ◽  
Lr White ◽  
Transmission Electron ◽  
Toxic Risk ◽  
Low Toxicity ◽  
Embedding Medium ◽  
Significant Health ◽  
Cure Accelerator

Most current EM embedding media require component mixing prior to use. Also, many epoxy resins are carcinogenic and can present significant health hazards in the unpolymerized form. LR White acrylic embedding resin(by London Resin Co.; available Fullam, Pelco, Polaron etc.) is a one component, extremely low viscosity resin. The resin, according to Mfr. has a very low toxicity both in monomeric and polymerized states. We have found no skin sensitivity specifically known to be related to the resin over a period of 1 yr routine resin use. The cold cure accelerator does have some toxic risk, and contact with skin and eyes should be avoided. Accelerator, however, is not used for thermal curing. Because of resin advantages, the purpose of this study was to determine routine TEM methods consistent with LR White resin use for a variety of sample types(fungal, plant, and animal).

Photo-initiated and thermal curing of epoxides by the use of photo-base generators bearing acyloxyimino groups

1995 ◽  
Vol 73 (11) ◽  
pp. 1924-1932 ◽  
Author(s):  
Ken-ichi Ito ◽  
Yoshitaka Shigeru ◽  
Yu-uichi Kawata ◽  
Katsuhiko Ito ◽  
Masahiro Tsunooka
Keyword(s):  
Glass Transition ◽  
Glycidyl Methacrylate ◽  
Epoxy Resins ◽  
Room Temperature ◽  
The Other ◽  
Quantum Yields ◽  
Thermal Curing ◽  
Very High ◽  
Acetophenone Oxime ◽  
Group Photo

The formation of amines by the photolysis of O-acyloximes derived from acetophenone oxime, benzophenone oxime, fluorenone oxime, and 2-acetonaphthone oxime and the curing of epoxides by the resulting amines were investigated. The quantum yields of their photolysis at 366 nm in polystyrene films depend on their structures, and those for bifunctional ones bearing phenyl or naphthyl moieties were found to be very high, at 0.88 and 0.76, respectively. The yields of the resulting amines in polymer matrices were higher than those in solution. The yields for O-acyloximes bearing a naphthyl moiety were ca. 90% and higher than for those bearing a phenyl moiety. Although the resulting amines were efficient photo-cross-linkers for poly(glycidyl methacrylate), they were not effective for curing of epoxy resins (oligomers). On the other hand, polymer amines with a glass transition temperature lower than room temperature, which were obtained by the photolysis of copolymers bearing acyloxyimino groups, were found to be effective photo-cross-linkers for the epoxy resins. Keywords: photo-base generator, acyloxyimino group, photo-initiated and thermal curing, poly(glycidyl methacrylate), epoxy resin.

scholarly journals Mechanical and thermal properties of triblock copolymer modified epoxy resins

BIBECHANA ◽  
2018 ◽  
Vol 16 ◽  
pp. 196-203 ◽  
Author(s):  
Shankar P Khatiwada ◽  
Sabu Thomas ◽  
Jean Marc Saiter ◽  
Ralf Lach ◽  
Rameshwar Adhikari
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resins ◽  
Triblock Copolymer ◽  
Mechanical Performance ◽  
Triblock Copolymers ◽  
Diglycidyl Ether ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Thermoset Resin ◽  
Modified Epoxy

We investigate the ways of improving thermal and mechanical properties of diglycidyl ether of bisphenol-A (DGEBA) based thermoset resin using diaminodiphenylsulphone (DDS) as hardener and using epoxidized polystyrene/polybutadiene-based triblock copolymers as modifier. The epoxidation was performed. The targeted chemical modification using meta-chloroperoxybenzoic acid (m-CPBA) of the copolymer was performed whereby the epoxidation of the butadiene chains mainly took place at 1,4 linkages. The modification copolymer was found to contribute in enhancing the mechanical performance of the blends with epoxy resin. The results indicated the formation of nanostructured morphology in the blends attributable to their enhanced impact strength.BIBECHANA 16 (2019) 196-203

scholarly journals Model reactions of calixarenes and their esterified derivatives with glycidyl phenyl ether for thermal curing reactions of epoxy resins

2010 ◽  
Vol 42 (6) ◽  
pp. 456-463 ◽  
Author(s):  
Shengang Xu ◽  
Hiroto Kudo ◽  
Tadatomi Nishikubo ◽  
Shinya Nakamura ◽  
Shunichi Numata
Keyword(s):  
Epoxy Resins ◽  
Phenyl Ether ◽  
Thermal Curing ◽  
Model Reactions

scholarly journals Improving the toughness of thermosetting epoxy resins via blending triblock copolymers

RSC Advances ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 1603-1612 ◽  
Author(s):  
Lei Tao ◽  
Zeyu Sun ◽  
Wei Min ◽  
Hanwen Ou ◽  
Liangliang Qi ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Methyl Methacrylate ◽  
Epoxy Resin ◽  
Butyl Acrylate ◽  
Epoxy Resins ◽  
Triblock Copolymer ◽  
Triblock Copolymers ◽  
Poly Methyl Methacrylate ◽  
Copolymer Poly ◽  
Thermosetting Epoxy

In this study, the triblock copolymer poly(methyl methacrylate)-b-poly(butyl acrylate)-b-poly(methyl methacrylate) (MAM) was used to modify bisphenol A epoxy resin to improve its toughness.

scholarly journals Photo-generation of Poly-functional Thiol and Thermal Curing Reaction of Epoxy Resins Using the Thiol

1994 ◽  
Vol 26 (7) ◽  
pp. 864-867 ◽  
Author(s):  
Tadatomi Nishikubo ◽  
Atsushi Kameyama ◽  
Koutaro Kashiwagi
Keyword(s):  
Epoxy Resins ◽  
Thermal Curing ◽  
Curing Reaction

New pegylated hyperbranched polyester as chemical modifier of epoxy resins in UV cationic photocuring

2011 ◽  
Vol 71 (4) ◽  
pp. 417-424 ◽  
Author(s):  
D. Foix ◽  
X. Fernández-Francos ◽  
X. Ramis ◽  
A. Serra ◽  
M. Sangermano
Keyword(s):  
Epoxy Resins ◽  
Chemical Modifier ◽  
Hyperbranched Polyester
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