摘要:

AbstractBlock copoly(ether ester)s based on poly(butylene terephthalate) containing different amounts of poly(oxytetramethylene) were oriented by solid state extrusion. The degree of die swell decreases with increasing crystallinity of the extrudates. The morphological properties of the extrudates depend on the extrusion conditions. The long period is only determined by the undercooling. The dependence of the mechanical and dynamical‐mechanical properties of the extrudates on the extrusion condition was investigated. The chemical composition influences the mechanical behaviour strongly. It was concluded that this is due to the different concentration of the taut tie molecule

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051070101

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractA change in the internal structure of porous glass due to the formation of a polymer layer of poly(2,3‐epoxypropyl methacrylate) by polymerization on its surface was investigated. By using the methods of dynamic desorption of nitrogen and mercury porosimetry, the character of the polymer layer and its effect on the final porosity for various types of the original material were determine

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051070102

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe electrical properties of Ni(II) and Cu(II) chelate polymers of bis(2,4‐dihydroxybenzaldehyde), bis(2,4‐dihydroxyacetophenone), bis(2,4‐dihydroxybenzophenone), bis(2,4‐dihydroxybenzaldehyde)ethylenediimine, bis(2,4‐dihydroxyacetophenone)‐ethylenediimine, bis(2,4‐dihydroxybenzophenone)ethylenediimine and bis(2,4‐dihydroxyacetophenoneimine) and aromatic acid chlorides have been studied. The chelate polymers with the most rigid structure were found to have the highest

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051070103

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractChanges of physical properties caused by UV‐irradiation in films of PVC and their blend with modifying copolymers of vinyl chloride‐vinyl acetate or methyl methacrylate‐butadiene‐styrene have been investigated. On the basis of changes in solubility of films caused by UV‐irradiation, weight of gel, intrinsic viscosity of sol, Huggins constant, Charlesby coefficient, and dose for gelling it has been found that 1% of these copolymers in poly(vinyl chloride) changes its resistance to UV‐irradiation. The presence of methyl methacrylate‐butadiene‐styrene copolymers accelerates and raises the efficiency of the process of crosslinking of PVC, vinyl chloride‐vinylacetate copolymers slightly accelerate the degradation of this polymer, governing

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051070104

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractWater and electrolyte sorption (sulfuric acid) in perfluorosulfonic and polyethylene‐poly(styrene sulfonic acid) membranes of different crosslinking were investigated in a temperature range of 293–333 K and a concentration of external electrolyte up to 5.7 mol/kg H2O. Both variables caused deswelling of the membranes. Employing Glueckauf's theory the results were discussed in view of the physical structure of the membranes. Variations of the nonuniformity factors (Z) confirmed that the deswelling of the membrane proceeds mainly at the cost of the nonselective domains diminishing in that way the nonuniformity of the membra

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051070105

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe initial stage of the phosphoric acid‐catalyzed polycondensation reaction of furfuryl alcohol and formaldehyde was studied. The overall kinetics of monomer‐consuming reactions were investigated in dependence of the initial monomer ratio and the temperature by analytical and physical (GPC) methods. A Suitable NMR technique was developed to determine the quantitative change in methylene and methylene ether linkages formed under different reaction conditi

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051070106

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractOn a étudié les relaxations observées dans les copolymères statistiques du chlorure de vinylidène avec l'acrylonitrile et le chlorure de vinyle. Ces relaxations correspondant aux transitions vitreuses et sous‐vitreuses ont été interprétées a partir de la distribution des séquences, en termes de tétrades pour les premières et de diades pour les relaxations observées dans la zone de transition sous‐vitreuse.Dans la zone correspondant à la chute du module que nous assimilons à la zone de transition vitreuse on observe deux transitions dont les températures seraient respectivement 65 et 85 °C pour un copolymère de l'acrylonitrile et du chlorure de vinylidène contenant 25 mol‐% de chlorure de vinylidène. Pour les copolymères du chlorure de vinyle et du chlorure de vinylidène la relaxation correspondant à la transition sous vitreuse ß est observée nettement pour une teneur molaire en chlor

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051070107

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractA novel polyamideimide was synthesized by reacting sulfanilamide and N‐(4‐carboxy phenyl) trimellitimide or its diacid chloride derivative. The solution, thermal, electrical and a few other properties of the polymer were studied. The polymer was found to be soluble in the highly polar solvents. The polymer solution was relatively stable. Thermogravimetric data revealed that the polymer underwent 12% weight loss at 375 °C in air. The dielectric constant of the polymer at 30 °C was found to be 5.45 at 1 kHz. X‐ray diffraction data revealed that the polymer is crystalline in

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051070108

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractMoulded sheets made of high‐impact polystyrene (HI‐PS), containing three different commercial additives of which one at a time was3H‐labelled were kept in contact with14C‐labelled tricaprylin at 40 °C. The penetration of the tricaprylin into the HIPS sheets and the simultaneous migration of the additives into the tricaprylin were analyzed by means of radio‐tracer techniques, applied to thin cut sections of the plastic sheets.It turned out that irrespective of the special additive under investigation, the migration process is nearly totally determined by the swelling of the HI‐PS. The reason for this is to be found in the extraordinary strong interaction between HI‐PS and tricaprylin which is by no means representative of a contact system “plastic/edible fat” in general. By application of a simplified version of the mathematical model developed recently in our institute, a concise description of the migration process in the contact system “HI‐PS

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051070109

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractAus Polyethylen (HD‐PE) hoher Dichte und Polypropylen (PP) wurden unter Zusatz von 3‐(3,5‐Di‐tert.‐butyl‐4‐hydroxyphenyl)‐[3‐14C]propionsäurestearylester‐ genannt Antioxidans‐14C — jeweils 5 Flachfolien hergestellt, die unterschiedliche Mengen — nämlich ca. 0,02, 0,07, 0,1, 0,3 und 0,5 Gew.‐% des14C‐markierten Additivs enthielten. Prüflinge aus diesen HD‐PE bzw. PP‐Flachfolien wurden unter festgelegten Bedingungen mit dest. Wasser und mit dem synthetisierten Triglyceridgemisch HB 307 in Kontakt gehalten, um den Übertritt des Antioxidans‐14C in die Kontaktmedien in Abhängigkeit— von der Anfangskonzentration c0des Antioxidans‐14C in den Polyolefin‐Prüflingen bei konst. Prüfzeit t und Prüftemperatur T— von der Prüfzeit t bei konst. Prüftemperatur T und Anfangskonzentration c0und— von der Prüftemperatur T bei konst. Prüfzeit t und Anfangskonzentration c0radioanalytisch zu ermitteln.Die Untersuchungsergebnisse zeigen, daß der Zusammenhang zwischen der aus einem Polyolefin‐Prüfling in dest. Wasser bzw. Triglyceridgemisch HB 307 übertretenden Menge M an Antioxidans‐14C und den Einflußgrößen c0, t und T durch die folgenden Proportionalitätsbeziehungen beschrieben wird:\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm M}_{{\rm t},{\rm T}} \left( {{\rm c}_0 } \right) \sim {\rm c}_0 ;} & {{\rm M}_{{\rm c}_0 ,{\rm T}} \left( {\rm t} \right) \sim \sqrt {\rm t} ;} & {{\rm M}_{{\rm c}_0 ,{\rm t}} \left( {\rm T} \right) \sim {\rm e}^{{{ - {\rm E}} \mathord{\left/ {\vphantom {{ - {\rm E}} {{\rm RT}}}} \right. \kern-\nulldelimiterspace} {{\rm RT}}}} } \\\end{array} $$\end{document}Diese Proportionalitätsbedingungen können durch Produktbildung zu der Gleichung\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm M} = {\rm K} \cdot {\rm c}_0 \cdot \sqrt {\rm t} \cdot {\rm e}^{ - {{\rm E} \mathord{\left/ {\vphantom {{\rm E} {{\rm RT}}}} \right. \kern-\nulldelimiterspace} {{\rm RT}}}} $$\end{document}(K ist eine Proportionalitätskonstante) vereinigt werden, mit deren Hilfe bei Vorliegen weniger experimentell ermittelter Daten die Mengen an Bestandteilen, die unter beliebigen Temperatur‐ und Zeitbedingungen und bei unterschiedlichen Anfangskonzentrationen aus Polyolefinen in dest. Wasser bzw. Triglyceridgemisch HB 307 übertreten, im voraus berechnet werden können.Die Brauchbarkeit dieses mathematischen Ansatzes zur Be

ISSN:0003-3146    

DOI:10.1002/apmc.1982.051070110

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY