摘要:

AbstractThe main components of the “C9 cut”, a by‐product from steam cracking of gasoil or naphtha, have been cationically homopolymerized. The properties of the resulting homopolymers have been related to their structure. As some of the main application areas of the C9 resins are printing ink resins and adhesives, we focused primarily on these fields of application when considering the properties of these homopol

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051940101

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractThe interpenetrating polymer networks (IPN) of polyurethanes (PU) and a glycidyl ether of phenol formaldehyde (GEPF) were prepared by a simultaneous polymerization method. The dynamic mechanical properties and morphologies of the IPNs were investigated. It was found that multiphased morphology was formed in the PU/GEPF IPNs. With the PU based on polyester‐ or polyether‐type polyols, the dynamic mechanical analysis (DMA) of these IPNs exhibited various shifts in the loss moduli (E″) of the high and low temperature transition domains depending upon the types and molecular weights of the polyols employed in the PU. Three distinct transition domains were observed as the PU content increased up to a certain

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051940102

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractStarch‐g‐polystyrene and starch‐g‐poly(methyl acrylate) copolymers were synthesized and extruded without separating homopolymer PS or PMA. The extrusion behavior resembled that of thermoplastic melts in that these products were shear thinning and exhibited significant extrudate swelling and entrance pressure losses in capillary flow. These and other observations indicate that the materials comprise deformable polymer‐grafted starch particles suspended in the corresponding homopolymer melt. Flow is apparently by superparticle, rather than continuum melt m

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051940103

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractBei der industriellen Herstellung von polymeren Werkstoffen ist eine möglichst genaue Kenntnis des spezifischen Volumens v in Abhängigkeit vom Druck p und von der Temperatur T erforderlich. Dafür ist ein sogenannter „Biegeschwinger”︁ entwickelt worden, mit dem man v im Bereich von 1 bis 800 bar und von 20 bis 200°C ermitteln kann. Dieses wird an Testmessungen mit destilliertem Wasser bewiesen. Am Beispiel von fünf flüssigen Polymeren und Copolymeren wird die Brauchbarkeit sowohl empirischer als auch theoretisch fundierter Zustandsgleichungen überprüft. Dabei zeigt sich, daß die rein empirische Tait‐Gleichung und die zum Teil theoretisch fundierte Simha‐Somcynsky‐Gleichung mit sechs bzw. fünf anpasbaren Parametern die Meßwerte

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051940104

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractAn approach for the calculation of the optimal monomer addition policies for polymer composition control in emulsion terpolymerization is presented. The model allows the calculation of the composition of the initial charge of the reactor and the time dependent monomer addition rates. Monomer addition strategies for reactors with limited capacity for heat removal were obtained. A heat removal rate dependent on the latex solids content was considered. Simulation showed that the present approach leads to the production of homogeneous terpolymers in process times which are significantly shorter than that required by the classical starved process to produce a terpolymer of similar homogeneity.

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051940105

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractThe UV absorption characteristics of a number of dihydroxynaphthyl‐2H‐benzotriazoles, their (meth)acryloyloxy derivatives and the corresponding polymers have been studied in a range of solvents of different polarity. It was shown that the formation of hydrogen bonds in these compounds strongly depends on the polarity of the solvent and an equilibrium exists between intramolecular and intermolecular hydrogenbonded states. The stability of the intramolecular hydrogen bond was determined quantitatively. The equilibrium between the intramolecular and the intermolecular hydrogen‐bonded state of the molecule was strongly affected by the chemical structure of the naphthyl‐2H‐benzotriazole. The stability of the intramolecular hydrogen bond increased when electron‐donating substituents were introduced into the benzotriazole or when the naphthyl‐2‐benzotriazole was fixed to a p

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051940106

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractThe modification reaction of dextran with succinic anhydride using pyridine as catalyst and N,N‐dimethylformamide/lithiumchloride system as solvent was studied. The structure of the resulting polymers was determined by means of1H and13C NMR spectroscopy. A linear dependence of the reaction rate on succinic anhydride concentration was found. The orders with respect to pyridine and polymer concentrations were 1 and 2, respectively. The activation energy was found to be 69.0 kJ/mol.13C NMR spectra at 75.4 MHz of partially modified dextran with monosuccinate groups were studied in order to evaluate the selectivity of the reaction of dextran with succinic anhydride in the homogeneous phase. Analysis of the spectra of ring carbons in the anhydroglucose units shows that the reactivity of individual hydroxy groups decreases in the order C‐2 ∽ C‐3>C‐4. For samples with higher degree of substitution the order is C‐4>C‐3>C‐2. The results were explained by considering the formation of intramolecular hydrogen bonds as well as by steric

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051940107

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractUltra low density polyethylene (PE‐ULD), the newest and most recently commercialized member of polyethylene family, has been characterized in terms of structure, thermal and rheological properties, and molecular parameters. Since the prime use of PE‐ULD is polyolefin modifier, emphasis is put on the melt rheology of the samples to provide data base for blending with other res

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051940108

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractCommercially available Araldite™‐type polymers have been modified with cinnamic and furan acrylic acid chlorides. The polymers were photochemically crosslinked via a [2 + 2] cycloaddition. The resulting polymers show glass transition temperatures up to 130°C and dielectrical constants of ϵr= 3.0. Therefore, these polymers can be applied as permanent resists in multi‐layered wiring structures. Numerous well‐defined multifunctional modifiers have been synthesized. The effect of those modifiers on the polymerization and properties of the araldite‐type polymers has been studied in

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051940109

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractN,N′‐4,4′‐Diphenylmethan‐bismaleimid (BMI) wurde in halbfesten Phenolnovolak‐Epoxidharzen (EP) bis P̄, = 10 oligomerisiert. Die novolakgehärteten EP‐BMI‐Festharze bilden eine Zweiphasenstruktur, bestehend aus einer EP‐BMI‐Mischphase der beiden sich durchdringenden Netzwerke (interpenetrating polymer network, IPN) und einer BMI‐Phase. Die dynamisch‐mechanischen Eigenschaften hängen vom Gesamt‐BMI‐Anteil w2und vom Oligomerisierungsgrad P̄ndes BMI ab. Der relative Schubmodul des EP‐BMI‐Harzes im kautschukelastischen Zustand zeigt, daß beide Phasen kohärent sein können. Die Glastemperatur Tgkorreliert mit dem Oligomerisierungsgrad, z. B. entspricht ΔPn≡ 10 einem ΔTg≡ 35 K und einem BMI‐Anteil Δ wx2≡ 0,25 in der Mischpha

ISSN:0003-3146    

DOI:10.1002/apmc.1992.051940110

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY