Structure-based coarse-graining for inhomogeneous liquid polymer systems

2013 ◽  
Vol 139 (5) ◽  
pp. 054901 ◽  
Author(s):  
Motoo Fukuda ◽  
Hedong Zhang ◽  
Takahiro Ishiguro ◽  
Kenji Fukuzawa ◽  
Shintaro Itoh
Keyword(s):  
Coarse Graining ◽  
Polymer Systems ◽  
Liquid Polymer

Rotational Moulding of Liquid Polymers

1996 ◽  
Vol 210 (5) ◽  
pp. 437-447 ◽  
Author(s):  
E Harkin-Jones ◽  
R J Crawford
Keyword(s):  
Ring Opening ◽  
Material Handling ◽  
Bubble Formation ◽  
Rotational Moulding ◽  
Polymer Systems ◽  
Moulding Process ◽  
Cycle Times ◽  
Liquid Polymer ◽  
Liquid Polymers ◽  
Rotationally Moulded

The vast majority of rotationally moulded articles are produced from powdered polymers. However, the moulding process developed originally from the use of liquid polymers and nowadays there is a renewed interest in such systems because of some unique advantages that they offer. This paper compares the behaviour of three different liquid polymer systems—nylon 6 by ring-opening caprolactam, polyvinyl chloride plastisol and polyurethane. The flow behaviour of each material is examined with particular reference to wall thickness distributions and bubble formation in the product. On the basis of this, criteria for the production of fault-free mouldings have been established. The interrelationships between mould shape and resin viscosity are also examined and an ideal viscosity—time—temperature profile is proposed for liquid polymer systems. Finally, a general comparison of the materials is made with regard to material handling, safety, cycle times, etc.

Coarse-graining in simulations of multicomponent polymer systems

2014 ◽  
Vol 141 (24) ◽  
pp. 244904 ◽  
Author(s):  
Vaidyanathan Sethuraman ◽  
Bryan H. Nguyen ◽  
Venkat Ganesan
Keyword(s):  
Coarse Graining ◽  
Polymer Systems ◽  
Multicomponent Polymer

scholarly journals Dynamic coarse-graining of polymer systems using mobility functions

2021 ◽  
Vol 33 (19) ◽  
pp. 194004
Author(s):  
Bing Li ◽  
Kostas Daoulas ◽  
Friederike Schmid
Keyword(s):  
Coarse Graining ◽  
Polymer Systems

Liquid Carboxyl-Terminated Poly(Butadiene)

1973 ◽  
Vol 46 (1) ◽  
pp. 139-147 ◽  
Author(s):  
R. F. Hoffman ◽  
R. H. Gobran
Keyword(s):  
Physical Properties ◽  
Aromatic Amines ◽  
Chain Extension ◽  
Moderate Amount ◽  
Polymer Systems ◽  
Liquid Polymer ◽  
Reinforcing Fillers ◽  
Curing Agents ◽  
Cure Reactions ◽  
Chromium Salt

Abstract In general HC-434 is a relatively homogeneous, difunctional polymer that can be readily chain extended through a variety of cure reactions. To date most of the work has been done with epoxide and aziridinyl curing agents, and a moderate amount of work has been done to improve the rates of cure by means of catalysts. Both aromatic amines and chromium salt complexes have proven to be effective catalysts. The physical properties of the chain-extended polymer with reinforcing fillers approach those of SBR vulcanizates, but improvement is still needed to achieve the properties required for tire formulations. The liquid polymer systems are suitable for belting, hose, and molding applications. However, additional work is required to develop the optimum cure systems for physical properties, faster catalysts, and alternative chain-extension reactions with other reactive curing agents.

Comparison Between Coarse-Graining Models for Polymer Systems: Two Mapping Schemes for Polystyrene

2007 ◽  
Vol 208 (19–20) ◽  
pp. 2109-2120 ◽  
Author(s):  
Vagelis A. Harmandaris ◽  
Dirk Reith ◽  
Nico F. A. van der Vegt ◽  
Kurt Kremer
Keyword(s):  
Coarse Graining ◽  
Polymer Systems

Structure-property relationships of PE/PP sandwiched films

1987 ◽  
Vol 45 ◽  
pp. 454-455
Author(s):  
J. Petermann ◽  
G. Broza ◽  
U. Rieck ◽  
A. Jaballah ◽  
A. Kawaguchi
Keyword(s):  
Mechanical Tests ◽  
Polymer Materials ◽  
Ionic Crystals ◽  
Structure Property ◽  
Polymer Systems ◽  
Structure Property Relationships ◽  
Oriented Films ◽  
Materials Used ◽  
Polymer Laminates ◽  
Heated Glass

Oriented overgrowth of polymer materials onto ionic crystals is well known and recently it was demonstrated that this epitaxial crystallisation can also occur in polymer/polymer systems, under certain conditions. The morphologies and the resulting physical properties of such systems will be presented, especially the influence of epitaxial interfaces on the adhesion of polymer laminates and the mechanical properties of epitaxially crystallized sandwiched layers.Materials used were polyethylene, PE, Lupolen 6021 DX (HDPE) and 1810 D (LDPE) from BASF AG; polypropylene, PP, (PPN) provided by Höchst AG and polybutene-1, PB-1, Vestolen BT from Chemische Werke Hüls. Thin oriented films were prepared according to the method of Petermann and Gohil, by winding up two different polymer films from two separately heated glass-plates simultaneously with the help of a motor driven cylinder. One double layer was used for TEM investigations, while about 1000 sandwiched layers were taken for mechanical tests.

Approaches for TEM imaging of cavitation in toughened nylon

1989 ◽  
Vol 47 ◽  
pp. 352-353
Author(s):  
Barbara A. Wood
Keyword(s):  
Morphological Characteristics ◽  
Structure Property ◽  
Polymer Systems ◽  
Selective Staining ◽  
Structure Property Relationships ◽  
Rubber Toughened ◽  
Shear Yield ◽  
Controversial Topic ◽  
Selection Of ◽  
Diamond Knife

A controversial topic in the study of structure-property relationships of toughened polymer systems is the internal cavitation of toughener particles resulting from damage on impact or tensile deformation.Detailed observations of the influence of morphological characteristics such as particle size distribution on deformation mechanisms such as shear yield and cavitation could provide valuable guidance for selection of processing conditions, but TEM observation of damaged zones presents some experimental difficulties.Previously published TEM images of impact fractured toughened nylon show holes but contrast between matrix and toughener is lacking; other systems investigated have clearly shown cavitated impact modifier particles. In rubber toughened nylon, the physical characteristics of cavitated material differ from undamaged material to the extent that sectioning of heavily damaged regions by cryoultramicrotomy with a diamond knife results in sections of greater than optimum thickness (Figure 1). The detailed morphology is obscured despite selective staining of the rubber phase using the ruthenium trichloride route to ruthenium tetroxide.

Interactions between citrate and montmorillonite-Al hydroxide polymer systems

1997 ◽  
Vol 48 (3) ◽  
pp. 463-472 ◽  
Author(s):  
R.P.T. JANSSEN ◽  
M.G.M. BRUGGENWERT ◽  
W.H. VAN RIEMSDIJK
Keyword(s):  
Polymer Systems
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