摘要:

Colloidal palladium supported on a chelate resin containing iminodiacetic acid groups was prepared by refluxing the palladium chelate resin in methanol-water. Using the resin-supported colloidal palladium as a catalyst, cyclopentadiene was hydrogenated to cyclopentene in 97.1% selectivity at 100% conversion of cyclopentadiene under 1 atm of hydrogen in methanol at 30°C. Finely dispersed metal particles ranging from 10 to 60 Å in diameter were observed in the resin by electron microscopy. Both x-ray microanalysis for palladium and elution analysis of palladium ion with an aqueous solution of ethylenediaminetetraacetic acid disodium salt demonstrated the existence of large amounts of palladium ion complexes in the resin. The amount of palladium metal in the resin was estimated to be about 5% of the total palladium. Since the resin, after removal of most of the ionic palladium, exhibited almost the same catalytic activity as before, it was concluded that the finely dispersed metal particles are the active species in the catalyst.

ISSN:0022-233X    

DOI:10.1080/00222338608081102

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Photopolymerization of acrylonitrile was studied with the isopropanol-Ag(I) system as initiator in aqueous medium. The rate of polymerization increased with time and reached a steady state within 10 min. The rate of polymerization was found to be proportional to [acrylonitrile]1.5, [Ag(I)]0.5, and [isopropanol]0.5. A probable mechanism consistent with the observed results is proposed and discussed.

ISSN:0022-233X    

DOI:10.1080/00222338608081103

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

p-Acryloylaminophenyl-2-(trimethylammonium)ethyl phosphate, p-methacryloylaminophenyl-2- (trimethylammonium)ethyl phosphate, and p-methacryloylbenzoylaminophenyl-2-(trimethylammonium)ethyl phosphate were prepared, characterized, and polymerized with 2,2′-azobisisobutyronitrile (AIBN). The properties of the resultant polymers are described.

ISSN:0022-233X    

DOI:10.1080/00222338608081104

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A new trend in flame- and heat-resistant polymers is the modification of organic by-products such as lignins. Here we continue a discussion of lignin modification; in particular, the reaction of lignosulfonates with chlorophosphazenes. The reactivity of Borregaard-type lignosulfonates toward chlorophosphazenes was studied. The properties of the products obtained, especially their flame and heat resistance, as well as SEM data, were investigated.

ISSN:0022-233X    

DOI:10.1080/00222338608081105

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Poly(acryloyl-L-valine) microspheres containing peroxyester groups were prepared by copolymerization of acryloyl-L-valine with di-t-butyl peroxyfumarate in acetophenone. Graft copolymerization of some vinyl monomers onto the microspheres was carried out by photolysis or thermolysis of the peroxyester groups in the microspheres. When benzyl methacrylate (BzMA) was used as the second monomer, BzMA conversion and grafting efficiency were found to increase with time. This might be ascribed to long lifetime of the polymer radicals in the microspheres. In fact, the very stable propagating radical of BzMA was observed by ESR in the photoinduced graft copolymerization system of the microspheres and BzMA at room temperature. The copolymerization process was investigated by ESR.

ISSN:0022-233X    

DOI:10.1080/00222338608081106

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Micelle formation by several styrene-isoprene two-block copolymers in selective solvents, viz., n-heptane, n-dodecane, N,N′-dimethylformamide, and N,N′ -dimethylacetamide, was studied by viscometry and photon correlation spectroscopy (PCS). Aggregation number and micellar weight were deduced by combining viscosity and PCS data. The temperature effect on the viscosity behavior of micellar solutions of block copolymers in different selective solvents is examined and explained.1H-NMR spectra of the copolymer in n-heptane were recorded at different temperatures to explain the characteristic features of micellar solutions.

ISSN:0022-233X    

DOI:10.1080/00222338608081107

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The polymerization of some kinds of vinyl monomer was found to occur without an ordinary initiator in aqueous solutions of AB-type block or random copolymers of sodium methacrylate with styrene as a so-called “uncatalyzed polymerization.” Although the spin trapping technique showed that the initiation mechanism by the block copolymer was the same as that by the random copolymer, the initiating ability of the block copolymer was lower than that of the random copolymer. Such results are attributable to the difference in the incorporating ability of monomer into the micelles formed by the block copolymer and into the hydrophobic areas formed by the random copolymer.

ISSN:0022-233X    

DOI:10.1080/00222338608081108

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

ISSN:0022-233X    

DOI:10.1080/00222338608081109

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0022-233X    

DOI:10.1080/00222338608081101

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor