Showing papers by "DSM published in 1981"
DSM1
TL;DR: In this article, the influence of the initial polymer volume fraction (ϕ) on the maximum draw ratio (λmax) of the dried films is examined in the temperature region from 90 −130°C.
Abstract: Ultradrawing of films of high-molecular-weight polyethylene (Mw = 15 × 106) produced by gelation crystallization from solution is discussed The influence of the initial polymer volume fraction (ϕ) on the maximum draw ratio (λmax) of the dried films is examined in the temperature region from 90–130°C The results can be described very well by the relation λmax = λ ϕ−1/2 where λ is the (temperature-dependent) maximum draw ratio of the melt-crystallized film An attempt is made to discuss the marked influence of the initial polymer volume fraction on λmax in terms of the deformation of a network with entanglements acting as semipermanent crosslinks
289 citations
DSM1
TL;DR: In this paper, the retention behavior of a series of amines was investigated in phase systems consisting of an alkyl-modified silica as column packing material and an aqueous buffer or buffer-propanol mixtures containing low concentrations of alkylsulphonates as the mobile phase.
74 citations
DSM1
TL;DR: A submitted manuscript is the version of the article upon submission and before peer-review as mentioned in this paper, while a published version is the final layout of the paper including the volume, issue and page numbers.
Abstract: • A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers.
52 citations
TL;DR: The recently discovered extended-chain structure in isotatic polystyrene gels opens new horizons on the stereochemistry of the polyolefins and molecular organization in polymeric gels as mentioned in this paper.
24 citations
DSM1
TL;DR: In this paper, the design and operating characteristics of a micro-type membrane cell as a differential detector for ionized compounds are described, where the column effluent is passed through one compartment of the detector and a reference electrolyte solution of the same composition as the eluent through the other.
17 citations
DSM1
TL;DR: In this paper, the main feature of this equipment is the flat dart with a diameter of 10 mm, which is smaller than most of the normalized dart dimensions for falling weight tests, and properties of the force transducer, especially developed by DSM for this dart, will be described as will the main advantages with respect to larger, hemispherical darts.
7 citations
DSM1
6 citations
DSM1
TL;DR: In this paper, the authors investigated the flammability characteristics of ammonia in mixtures with air, nitrogen and ammonia side-products, and found that flammable regions are not as large as those found in a previous study for mixtures of ammonia and hydrogen.
6 citations
Patent•
DSM1
TL;DR: A process for preparing substituted glyoxylic acid derivatives by oxidizing with a molecular oxygen containing gas an amide or ester of a hydroxy acid in the presence of a catalytic amount of a cobalt compound is described in this article.
Abstract: A process for preparing substituted glyoxylic acid derivatives by oxidizing with a molecular oxygen containing gas an amide or ester of a hydroxy acid in the presence of a catalytic amount of a cobalt compound.
1 citations
Patent•
DSM1
TL;DR: In this paper, a 3-thienylmalonic acid or a diester thereof is prepared by reacting in a polar solvent in the presence of a copper (I) halide a thiophene compound of formula:
Abstract: Preparation of a 3-thienylmalonic acid or a diester thereof comprising reacting in a polar solvent in the presence of a copper (I) halide a thiophene compound of formula: ##STR1## wherein X=I or Br, R1 =H or a C1-4 alkyl group, R2 =H or a C1-2 alkyl group and R3 =H or a C1-2 alkyl group,with the proviso that R2 and R3 cannot be an alkyl group simultaneously, with a mono-deprotonated methylene compound of formula: ##STR2## wherein a cation is present and Z'=Z" is CN or COOR in which R is a C1-4 alkyl group, or Z'=CN and Z"=COOR' in which R' is a C1-2 alkyl group, followed by hydrolysis by methods known per se to get the corresponding free acid.