摘要:

AbstractThe condensation of dimethylamine with epichlorohydrin gave an almost quantitative yield of 2‐hydroxy‐3‐dimethylaminopropyl chloride which was polymerized via the Menschutkin reaction to give 2‐hydroxy‐3‐ionene chloride. This cationically charged polymer was obtained in greater than 90% yields as a white to tan solid when precipitated into acetone. Number‐average molecular weights of up to 10,000 and intrinsic viscosities of up to 0.11 dl/g in 0.4Mpotassium bromide were found. These low molecular weights were attributed to several impurities that were identified as being produced by side reactions. Thermal analysis of the polymers showed an endothermic transition at 32–39°C with the onset of decomposition occurin

ISSN:0360-6376    

DOI:10.1002/pol.1975.170130311

出版商:John Wiley&Sons, Inc.    

年代:1975

数据来源: WILEY

摘要:

AbstractPolyesters were made with aromatic diacid chlorides and 4,4,‐thiodiphenol. Isophthaloyl chloride and/or terephthaloyl chloride were used as acid chlorides alone or together with 5‐cyanoisophthaloyl chloride or [2.2]p‐cyclophane‐3,9‐dicarboxylic acid chloride. The latter components were incorporated in order to make the polymers useful for crosslinking. A polyether could be obtained by polycondensation of 2,4‐dichloro‐benzonitrile and 4,4′‐thiodiphenol. The polycondensations were run in nitrob

ISSN:0360-6376    

DOI:10.1002/pol.1975.170130312

出版商:John Wiley&Sons, Inc.    

年代:1975

数据来源: WILEY

摘要:

AbstractThe polymerization of picryl (PMA), 2,4‐dinitrophenyl (2,4‐DNMA),2,6‐dinitrophenyl (2,6‐DNMA), 2‐methyl‐4,6‐dinitrophenyl (MDNMA), and 2,6‐dimethylphenyl methacrylates (DMMA) was carried out in benzene at 60°C. PMA, 2,6‐DNMA, and MDNMA did not undergo radical homopolymerization, while 2,4‐DNMA and DMMA did. The results suggest that the growing radical readily attacks the oxygen atom of the nitro group at the 2 position of the terminal phenyl group due to the steric effect of the substituent at the 6 position, resulting in chain termination. PMA formed a charge‐transfer complex with 2‐naphthyl methacrylate (NMA). The stoichiometric composition of this complex was shown to be 1:1 molar complex. PMA was readily copolymerized with NMA. The amount of solvent affected the composition of the copolymer obtained at a given same mole fraction in feed. The results suggest that charge‐transfer interaction between the ester groups affects the

ISSN:0360-6376    

DOI:10.1002/pol.1975.170130313

出版商:John Wiley&Sons, Inc.    

年代:1975

数据来源: WILEY

摘要:

AbstractA study designed to ascertain the role of singlet molecular oxygen in the photodegradation of plastics established that most classes of dye chromophores are sensitizers in polymer films, absorbing light and transferring the absorbed energy to ambient triplet ground state molecular oxygen, generating metastable reactive singlet molecular oxygen. Unsaturated polymers containing polybutadiene, polyisoprene, etc. are highly reactive to singlet oxygen produced through photosensitization, generating hydroxylic and carbonyl derivatives and losing their rubbery properties as consequences of such reactions. Many types of transition metal chelates are singlet oxygen quenchers. The relationships of the structures and spectroscopic properties of these chelates to their efficiency in quenching singlet oxygen are examined and discussed.

ISSN:0360-6376    

DOI:10.1002/pol.1975.170130314

出版商:John Wiley&Sons, Inc.    

年代:1975

数据来源: WILEY

ISSN:0360-6376    

DOI:10.1002/pol.1975.170130315

出版商:John Wiley&Sons, Inc.    

年代:1975

数据来源: WILEY

ISSN:0360-6376    

DOI:10.1002/pol.1975.170130316

出版商:John Wiley&Sons, Inc.    

年代:1975

数据来源: WILEY

ISSN:0360-6376    

DOI:10.1002/pol.1975.170130317

出版商:John Wiley&Sons, Inc.    

年代:1975

数据来源: WILEY

ISSN:0360-6376    

DOI:10.1002/pol.1975.170130318

出版商:John Wiley&Sons, Inc.    

年代:1975

数据来源: WILEY

ISSN:0360-6376    

DOI:10.1002/pol.1975.170130319

出版商:John Wiley&Sons, Inc.    

年代:1975

数据来源: WILEY