摘要:

AbstractScoured ply cotton yarn was slack mercerized and slack mercerized followed by restretching the yarn in the mercerizing solution to 90, 94, 96, 100, and 103% of the original length. The six substrates so obtained together with scoured cotton were grafted independently with methyl methacrylate and acrylonitrile using ceric ammonium nitrate as initiator. The extent and rate of grafting found with slack mercerized cotton were significantly higher than those of scoured cotton irrespective of monomer used.The same holds, but lo lesser degree, good for slack mercerized cotton followed by restretching to 90% of original length. Different situation was encountered with slack mercerized cotton followed by restretching to 94 and 103%; these substrates showed lower extent and rate of grafting than scoured cotton. Moreover, the extent and rate of grafting decreased by increasing the magnitude of stretching. Similar trend was observed when all the said substrates were subjected to oxidation with ceric ions. It is believed that there must be differences in microstructural features between scoured cotton, slack mercerized cotton and slack mercerized‐restretched cottons that account for thi

ISSN:0003-3146    

DOI:10.1002/apmc.1981.051010101

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractPoly(phenylene carboxylate) and the corresponding copolyesters were prepared respectively by homopolycondensation of m‐ and p‐hydroxybenzoyl chlorides and by condensation of a mixture of acid chlorides of ortho‐ and para‐hydroxy benzoic acids. These polyesters which did not undergo Fries rearrangement were hydroyzed to acid monomers on treatment with hot aqueous acid solution. The copolyesters were characterized and compared with the corresponding homopol

ISSN:0003-3146    

DOI:10.1002/apmc.1981.051010102

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractNew poly(ferroccenylene azomethines) were synthesized by polycondensation of 1,1′‐diacetylferrocene and 1,1′‐bis[β‐(2‐furyl)‐acryloyl] ferrocene with several aromatic diamines of the benzidine type and sulphynyl derivatives with ether thioether or disulphide bridges between the benzene rings. The obtained polymers were stable up to 200°C and showed semiconducting properties. The oxygen or sulphur atoms in the diamine component did not modify significantly the pol

ISSN:0003-3146    

DOI:10.1002/apmc.1981.051010103

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractDispersionen anionischer Polyurethane mit SO −3‐Gruppen und Na+als Gegenionen wurden durch Ionenaustausch mit anderen Kationen (H+, Ag+, Ca++, Ba++, Ni++, Cu++, Zn++, Pb++und AI+++) versehen. Der Ionenaustausch erfolgte mit Ausnahme von AI+++nahezu quantitativ. Dies zeigt, daß keine Kationen auf der Partikeloberfläche an Anionen gebunden sind. Weiterhin wurde der Einfluß des Kations auf die Lagerstabilität der Dispersionen und auf die Eigenschaften der aus ihnen hergestellten Folien u

ISSN:0003-3146    

DOI:10.1002/apmc.1981.051010104

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractAm Beispiel von Copolymeren aus Styrol und Butadien wird gezeigt, daß die Haftung des Metalls bei der galvanischen Metallisierung vom Gehalt an Butadien abhängt.Bei einem Butadiengehalt von ∼73 Gew.‐% beträgt die Abzugsfestigkeit der galvanischen Schicht ∼60 N/25 mm, wenn mit klassischen Vorbeizen aus Chromtrioxid, Schwefelsäure und Phosphorsäure gearbeitet wird. Spektroskopisch wird nachgewiesen, daß die Verwendung dieser Beizen zu einer irreversiblen Verankerung von Chrom und Schwefel an der Polymeroberfläche führt. Dadurch wird der elektrische Oberflächenwiderstand des polymeren Basismateri

ISSN:0003-3146    

DOI:10.1002/apmc.1981.051010105

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe porous structure of both the powdered poly(ethylene terephthalate) and polyamide 6 prepared by reprecipitation from the melt of 6‐caprolactam was studied using the combination of a penetration method and a sorption one. The measurements of the apparent density and of the real one were used for the porosity measurements. The pore size measurement by means of the mercury penetration was used for the pore distribution in the range of macropores (7500–15.8 nm). In the range of mesopores (15.8–1.8 nm), the pore measurement by means of the benzene desorption isotherm at 298 K was used for the pore distribution determination. As for the powdered poly(ethylene terephthalate), the porosity was found in the range from 50 to 80%, the volume of mesopores was in the range from 0.2 to 0.5 cm3g−1, and the volume of the macropores ranged from 1.5 to 2.8 cm3g−1. The powdered polyamide 6 did not contain any mesopores and the volume of the macropores was as high as 0.7 cm3g−1.When using further lactams of ω‐aminoacids, i.e. 2‐pyrrolidone, 8‐capryllactam, 12‐laurinlactam, as melt solvents for a preparation of the powdered poly(ethylene terephthalate), it resulted in decreasing of the specific surface area, porosity and furthermore by an abse

ISSN:0003-3146    

DOI:10.1002/apmc.1981.051010106

出版商:Hüthig&Wepf Verlag    

年代:1981

数据来源: WILEY