Size Effect of Nanoparticle Diffusion in a Polymer Melt

2014 ◽  
Vol 47 (20) ◽  
pp. 7238-7242 ◽  
Author(s):  
Christopher A. Grabowski ◽  
Ashis Mukhopadhyay
Keyword(s):  
Size Effect ◽  
Polymer Melt ◽  
Nanoparticle Diffusion

scholarly journals Characterization of the Fluidity of the Ultrasonic Plasticized Polymer Melt by Spiral Flow Testing under Micro-Scale

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 357 ◽  
Author(s):  
Bingyan Jiang ◽  
Yang Zou ◽  
Tao Liu ◽  
Wangqing Wu
Keyword(s):  
Size Effect ◽  
Amorphous Polymer ◽  
Polymer Melt ◽  
Mold Temperature ◽  
Polyamide 66 ◽  
Spiral Flow ◽  
Crystalline Polymers ◽  
Micro Scale ◽  
Flow Length ◽  
And Control

The fluidity of a molten polymer plasticized by ultrasonic vibration was characterized by spiral flow testing based on an Archimedes spiral mold with microchannels. Mold inserts with various channel depths from 250 to 750 µm were designed and fabricated to represent the size effect under micro-scale. The effect of ultrasonic plasticizing parameters and the mold temperature on the flow length was studied to determine the rheological nature of polymers and control parameters. The results showed that the flow length decreased with reduced channel depth due to the size effect. By increasing ultrasonic amplitude, ultrasonic action time, plasticizing pressure, and mold temperature, the flow length could be significantly increased for both the amorphous polymer polymethyl methacrylate (PMMA) and the semi-crystalline polymers polypropylene (PP) and polyamide 66 (PA66). The enhanced fluidity of the ultrasonic plasticized polymer melt could be attributed to the significantly reduced shear viscosity.

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.

Probabilistic modelling of the size effect on ductility of a C-Mn steel

1998 ◽  
Vol 08 (PR8) ◽  
pp. Pr8-63-Pr8-70
Author(s):  
S. Carassou ◽  
M. Soilleux ◽  
B. Marini
Keyword(s):  
Size Effect ◽  
Probabilistic Modelling ◽  
Mn Steel

Ring size effect in McMurry cyclization of 1,ω-di((azulen-1-yl)-carbonyl) alkanes

2020 ◽  
Vol 65 (1) ◽  
pp. 83-88
Author(s):  
Eugenia Andreea DRAGU ◽  
◽  
Alexandru C. RAZUS ◽  
Keyword(s):  
Size Effect ◽  
Ring Size
Sign in / Sign up

Export Citation Format

Share Document