摘要:

AbstractThe modification of epoxy resins by reactions involving their hydroxyl groups is described. For example, reactions with enol ethers, acrylonitrile, ethyl acetoacetate and certain other carboxylic esters, or triethyl orthoformate, gave products which had reduced reactivities towards various hardeners, and which therefore gave lower peak temperatures on cure and/or longer usable lives. Suitable modification of epoxy resins with various other reagents(certain acid anhydrides, epichlorohydrin, orN‐hydroxymethylacrylamide) introduces additional useful functional groups. The uses of a diisocyanate and of α‐naphthyl isocyanate to modify epoxy resins or their mixtures prior to GPC analysis are also menti

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810101

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe cationic polymerization of a series of pentafulvenes with two exocyclic substituents yields highly reactive unsaturated polymers, which are soluble in nonpolar organic solvents. The preparative aspects as well as some properties of the polymers are discussed. Most polymers are very sensitive to oxygen. For instance poly(5‐isopropylidene‐3‐cyclopenten‐1,2‐ylene) (2a), which is obtained with molecular weights up to 350 000, consumes more than one mol‐equivalent of oxygen per rep

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810102

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe cationic polymerisation of pentafulvenes1a–gyields highly unsaturated macromolecules. The structure of the resulting polymers2a–ghas been proved by combination of spectroscopic methods, especially by analysis of the13C NMR‐sp

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810103

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe structure of cationic poly(6,6‐dimethylfulvene) (2a) has been confirmed by synthesis of 4 model compounds6, 7, 8, 9and comparison of the spectral data with those of the polyfulvene. 5‐Isoproylidenetricyclo[5.2.1.02.6]dec‐3‐ene (6) shows the same sensitivity towards oxygen as2a. The reaction of6with oxygen yields a 1:1‐copolymer, for which structure10has been proved by means of spectroscopi

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810104

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractPoly(propylene) has been oxidized at temperatures between 240 and 289°C. The products were GC separated and on‐line identified by an interfaced GC peak identification system. The major products are CO2, H2O, acetaldehyde, acetone, butanal, formaldehyde, methanol and other ketones and aldehydes. Most of the products can be accounted for by well‐known reactions of alkoxyl and peroxyl radicals; the major products are derived from the secondary alkoxy and peroxy species. Oxygen starvation is manifested in diffusion limited products of olefins and dienes, and the increase of CO2and H2O formation in pure oxygen atmosphere. The first order rate constant at 240°C is 2,4·10−3S−1with an overall activation energy of ca. 16 kcal·mol−1(67 kJ·mol−1). If one assumes the oxidative pyrolysis to share the same reaction pathways as autoxidation at lower temperatures, then the observed rate constants and activation energy may be calculated from kinetic parameters measured earlier for autoxidation of poly(propylene) from 71 to 140°C. Good agreement was obtained implying a similarity of oxidative degradation of the polymers spanning a large

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810105

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe present paper describes the synthesis of tetrakis [4‐(1‐phenylvinyl)phenyl]plumbane (1). It was found that “living” mono‐ or difunctional carbanionic polystyrenes are able to react with compound1to form star‐shaped polymers or tetrafunctional crosslinked networks, resp., and it could also be shown that this polyfunctional lead compound can be used to prepare starshaped copolymers containing polystyrene and poly(methyl methacrylat

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810106

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractBased on a previous work the polymerization mechanism of anthracene was studied and it was found that the initial reaction step is represented by the formation of a radical ion. Poly(9,10‐anthrylene) was prepared in order to study the relevant properties with respect to its technological applicability. Pure poly(9,10‐anthrylene)s even of relatively low molecular weight (about 3 000) are infusable and nearly insoluble. Poly(9,10‐anthrylene)s show good photocondu

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810107

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractAttempts were made to obtain fusible or soluble derivatives of poly(9,10‐anthrylene) by incorporation of intermediate links in 9‐ and 10‐position, i.e., by preparing a polyester and a polyanhydride of 9,10‐anthracenedicarboxylic acid as well as a polycarbonate of 9,10‐anthrahydroquinone. The results showed that the preparation of the polyester is very difficult and that its thermal resistance is very low (m.p. 140°C, decomposition). The polyanhydride could be obtained in good yields, but it is insoluble and decomposes at the melting point. The polycarbonate could easily be prepared, but it decomposes in a strongly exothermic reaction at 185°C and forms an

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810108

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

Abstract5‐Methacryloyl‐ and 5‐isobutyrylaminosalicylaldehydes (5aand5b, respectively) and diastereomeric complexes of their Schiff bases with amino acids and Co(III): potassium Λ‐ and Δ‐bis‐[N‐5‐methacryloylaminosalicylidene‐(S)‐valinato]cobaltate(III) (6a,b), potassium Λ‐ and Δ‐bis[N‐5‐isobutyrylaminosalicylidene‐(S)‐norvalinato]cobaltate(III) (7a, b), potassium Λ‐ and Δ‐bis[N‐5‐methacryloylaminosalicylidene‐(S)‐norvalinato]cobaltate(III) (8a, b), have been synthesized. Copolymerization of6–7a, bwith acrylamide andN,N′‐methylenebis(acrylamide) leads to the formation of transparent hydrophilic gels in which the amino acid fragments preserve their ability of exchanging α‐hydrogen for deuterium in an alkaline medium. Comparison of the behaviour of polymer complexes ℗‐7aand ℗‐7bin the process of base‐catalyzed epimerization with their monomer analogues8aand8bshows that their stereoselectivity substantially changes when one goes from8ato ℗‐7a. Such an effect may be explained by stabilization of the initial conformation of the complex molec

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810109

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractCopolymerization of phenyl methacrylate,p‐tolyl methacrylate, andp‐chlorophenyl methacrylate with styrene was carried out in the absence and in the presence of ZnCl2. It was found by13C NMR,1H NMR, and IR spectroscopy that complexes of zinc chloride with the corresponding methacrylates are formed. Reactivity ratios as well asQandevalues for the monomers and complexes were calculated. A correlation betweenevalues and13C chemical shift of the vinyl group of monomers and complexes with ZnCl2was fo

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810110

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY