Long-Chain Branches in Syndiotactic Polypropene Induced by Vinyl Chloride

2010 ◽  
Vol 211 (13) ◽  
pp. 1472-1481 ◽  
Author(s):  
Florian J. Stadler ◽  
Burçak Arikan ◽  
Joachim Kaschta ◽  
Walter Kaminsky
Keyword(s):  
Vinyl Chloride ◽  
Long Chain

Long chain branching in poly(vinyl chloride)

2007 ◽  
Vol 33 (1) ◽  
pp. 201-209 ◽  
Author(s):  
K. W. Small ◽  
F. Yearsley ◽  
J. C. Greaves
Keyword(s):  
Vinyl Chloride ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Poly Vinyl Chloride ◽  
Long Chain

Polymerizable Derivatives of Long-Chain Fatty Acids - Vinyl Stearate and Copolymerization of Vinyl Chloride with Other Vinyl Esthers

1955 ◽  
Vol 47 (3) ◽  
pp. 472-480 ◽  
Author(s):  
William S. Port ◽  
Edmund F. Jordan ◽  
William E. Palm ◽  
Lee P. Witnauer ◽  
John E. Hansen ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Vinyl Chloride ◽  
Long Chain Fatty Acids ◽  
Derivatives Of ◽  
Long Chain ◽  
Chain Fatty Acids

Polymer Morphology Revealed by Staining Techniques

1981 ◽  
Vol 39 ◽  
pp. 340-341
Author(s):  
A. C. Reimschuessel ◽  
V. Kramer
Keyword(s):  
Polymer Melt ◽  
Nylon 6 ◽  
Morphological Features ◽  
Negative Staining ◽  
Polymer Morphology ◽  
Crystallizable Polymer ◽  
Staining Techniques ◽  
Long Chain

Staining techniques can be used for either the identification of different polymers or for the differentiation of specific morphological domains within a given polymer. To reveal morphological features in nylon 6, we choose a technique based upon diffusion of the staining agent into accessible regions of the polymer.When a crystallizable polymer - such as nylon 6 - is cooled from the melt, lamellae form by chainfolding of the crystallizing long chain macromolecules. The regions between adjacent lamellae represent the less ordered amorphous domains into which stain can diffuse. In this process the lamellae will be “outlined” by the dense stain, giving rise to contrast comparable to that obtained by “negative” staining techniques.If the cooling of the polymer melt proceeds relatively slowly - as in molding operations - the lamellae are usually arranged in a radial manner. This morphology is referred to as spherulitic.

A theory of contamination in electron microscopes by surface diffusion

1978 ◽  
Vol 36 (1) ◽  
pp. 116-117
Author(s):  
J.T. Fourie
Keyword(s):  
Electron Beam ◽  
Surface Diffusion ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Physical Parameters ◽  
Carbon Compounds ◽  
Hydrocarbon Molecules ◽  
Electron Microscopes ◽  
Primary Electrons ◽  
Long Chain

Contamination in electron microscopes can be a serious problem in STEM or in situations where a number of high resolution micrographs are required of the same area in TEM. In modern instruments the environment around the specimen can be made free of the hydrocarbon molecules, which are responsible for contamination, by means of either ultra-high vacuum or cryo-pumping techniques. However, these techniques are not effective against hydrocarbon molecules adsorbed on the specimen surface before or during its introduction into the microscope. The present paper is concerned with a theory of how certain physical parameters can influence the surface diffusion of these adsorbed molecules into the electron beam where they are deposited in the form of long chain carbon compounds by interaction with the primary electrons.

The effects of low-ratio n-6/n-3 PUFA on biomarkers of inflammation: a systematic review and meta-analysis

2021 ◽  
Author(s):  
Yali Wei ◽  
Yan Meng ◽  
Na Li ◽  
Qian Wang ◽  
Liyong Chen
Keyword(s):  
Systematic Review ◽  
Fatty Acid ◽  
Polyunsaturated Fatty Acid ◽  
Meta Analysis ◽  
Chain Polyunsaturated Fatty Acid ◽  
Inflammation Markers ◽  
Pufa Supplementation ◽  
Long Chain

The purpose of the systematic review and meta-analysis was to determine if low-ratio n-6/n-3 long-chain polyunsaturated fatty acid (PUFA) supplementation affects serum inflammation markers based on current studies.

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