Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Peter C. Zhu"'
Publikováno v:
Journal of Macromolecular Science, Part A. 47:545-551
Commercially available grades of fully hydrolyzed PVA are not 100% hydrolyzed. In practice, these polymers actually have residual acetyl groups. The remaining unhydrolyzed PVA can be hydrolyzed to 100%, but the subsequent purification process has pro
Publikováno v:
Journal of Polymer Research. 17:725-730
Crosslinking reactions are one of the most commonly used techniques to improve physical properties of polyvinyl alcohol (PVA). Commonly used crosslinkers for these reactions are di-functional compounds, such as glutaraldehyde and glyoxal. The hydroxy
Publikováno v:
Science in China Series B: Chemistry. 50:249-252
Substituted-benzene-1,2-dicarbaldehydes were synthesized by the reaction of substituted-1,2-bis(dibromomethyl) benzenes with fuming sulfuric acid, followed by hydrolysis. The yields were significantly improved by introducing solid sodium bicarbonate
Publikováno v:
Journal of Heterocyclic Chemistry. 43:361-363
The oxidation of ortho-phthalaldehyde to phthalic acid in aqueous solutions can be remedied by the addition of various cyclic acetals, which, when reacted with phthalic acid, yields ortho-phthalaldehyde, thus prolonging the lifetime of the ortho-phth
Publikováno v:
Journal of Polymer Science Part A: Polymer Chemistry. 35:485-491
The stable cyclic ketene acetal, 2-methylene-1,3-dioxepane, 7, has been polymerized cationically in pentane, CH 2 Cl 2 and THF at 25°C to form a polymer which is composed of both ring-opened (40-50% ) and ring-retained (50-60%) structures-Initiation
Publikováno v:
Journal of Polymer Science Part A: Polymer Chemistry. 34:2195-2203
Copolymers of the cyclic ketene acetals, 2-methylene-5,5-dimethyl-1,3-dioxane, 3, (M 1 ) with 2-methylene-1,3-dioxolane, 4, (M 2 ) or 2-methylene-1,3-dioxane, 5, (M 2 ), were synthesized by cationic copolymerization. An experimental method was design
Autor:
Peter C. Zhu, Charles U. Pittman
Publikováno v:
Journal of Polymer Science Part A: Polymer Chemistry. 34:169-174
Stable polymers were made by the cationic 1,2-polymerization of cyclic ketene acetals initiated by acid-washed glassware or acid-washed glass beads. Among several reactions possible for the very reactive cyclic ketene acetals, only the corresponding
Autor:
Charles U. Pittman, Peter C. Zhu
Publikováno v:
Journal of Polymer Science Part A: Polymer Chemistry. 34:73-80
Stable polymers were made by the cationically initiated 1,2-polymerization of cyclic ketene acetals employing heterogeneous, activated carbon-supported sulfuric acid catalysts. A methodology has been established for the preparation of the carbon blac
Publikováno v:
ChemInform. 27
Publikováno v:
The Journal of Organic Chemistry. 60:5729-5731