HyperMacs. Long Chain Branched Analogues of Hyperbranched Polymers Prepared by the Polycondensation of AB2 Macromonomers

2006 ◽  
Vol 240 (1) ◽  
pp. 56-67 ◽  
Author(s):  
Lian R. Hutchings ◽  
Jonathon M. Dodds ◽  
Susan J. Roberts-Bleming
Keyword(s):  
Hyperbranched Polymers ◽  
Long Chain

scholarly journals HyperMacs – long chain hyperbranched polymers: A dramatically improved synthesis and qualitative rheological analysis

2008 ◽  
Vol 44 (3) ◽  
pp. 665-676 ◽  
Author(s):  
Nigel Clarke ◽  
Edoardo De Luca ◽  
Jonathan M. Dodds ◽  
Solomon M. Kimani ◽  
Lian R. Hutchings
Keyword(s):  
Hyperbranched Polymers ◽  
Rheological Analysis ◽  
Long Chain

High‐toughening modification of polylactic acid by long‐chain hyperbranched polymers

2021 ◽  
pp. 51295
Author(s):  
Jianjian Sun ◽  
Yujuan Jin ◽  
Bo Wang ◽  
Huafeng Tian ◽  
Kaier Kang ◽  
...  
Keyword(s):  
Polylactic Acid ◽  
Hyperbranched Polymers ◽  
Long Chain ◽  
Toughening Modification

Rheological properties of HyperMacs-long-chain branched analogues of hyperbranched polymers

2007 ◽  
Vol 45 (19) ◽  
pp. 2762-2769 ◽  
Author(s):  
Jonathan M. Dodds ◽  
Edoardo De Luca ◽  
Lian R. Hutchings ◽  
Nigel Clarke
Keyword(s):  
Rheological Properties ◽  
Hyperbranched Polymers ◽  
Long Chain

Intramolecular cyclization of long-chain hyperbranched polymers (HyperMacs) from A2 + Bn step-wise polymerization

2016 ◽  
Vol 7 (29) ◽  
pp. 4717-4727 ◽  
Author(s):  
Qingfu Ban ◽  
Jie Kong
Keyword(s):  
Intramolecular Cyclization ◽  
Topological Analysis ◽  
Hyperbranched Polymers ◽  
Long Chain

We presented a precise topological analysis on intramolecular cyclization for long-chain hyperbranched polymers via the new parameter of the macro-cyclic index (m-CI).

Rheological Properties of HyperMacs—Long Chain Branched Analogues of Hyperbranched Polymers

2008 ◽  
Author(s):  
Jonathan M. Dodds ◽  
Edoardo De Luca ◽  
Lian R. Hutchings ◽  
Nigel Clarke ◽  
Albert Co ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Hyperbranched Polymers ◽  
Long Chain

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.

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