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Henan Tongwei Medical Equipment Co., LtdCall us : +86 − −19139704654 // Email us : [email protected]
Polymer any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units Polymers make up many of the materials in living organisms and they constitute the basis of certain minerals and human-made materials such as paper and plastics
Effect of molecular weight on secondary Newtonian plateau at high shear rates for linear isotactic melt blown polypropylenes: Autor: Drbek Jiř Zatloukal Martin Martyn Mike T Typ dokumentu: Recenzovan odborn člnek (English) Zdrojov dok : Journal of Non-Newtonian Fluid Mechanics 2018 vol 251 p 107-118: ISSN: 0377-0257 (Sherpa/RoMEO JCR) Journal Impact This chart shows
Biodegradable polymers play a crucial role in the medical device field with a broad range of applications such as suturing drug delivery tissue engineering scaffolding orthopaedics and fixation devices Poly-l-lactic acid (PLLA) is one of the most commonly used and investigated biodegradable polymers The objective of this study was to determine the influence low shear microbore
M Molecular weight of the base fluid used nanofluid of Newtonian as well as non-Newtonian types to investigate the effect of solid particle concentra-tion on magneto-hydrodynamic flow over stretching sheet [5 21 28] It was concluded that nanofluid with metallic nanoparticle shows better performance than that of base fluid It has been proven by many researchers that the induced
Introducing Polyolefins 1 2 Content Importance of polyolefins Global consumption Domestic production and consumption Application Polyolefins family PE classification PP structures Key properties Additivation 3 Polyolefins: the most important synthetic polymers Global plastics production in 2013 approximately 300 Million tons Polyolefins represent 45% PVC 14% PS 7% PET 6% PUR 5% ABS
On the other hand the viscosity at the secondary Newtonian plateau η ∞ reported in this work for low molecular weight PPs is almost one order of magnitude lower in comparison with conventional high molecular weight PPs reported in at the same temperature 230 C This can be understood by considering a lower friction between highly oriented macromolecules At very high shear rates
HEAT AND MASS TRANSFER IN PYROLYSIS The experimental data reviewed in the previous chapter generally referred to small particles 100 ~m) and low pressures (atmospheric or lower) Under these conditions heat and mass transfer are rapid and have relatively small influence on weight loss and product yields In this chapter we will examine the more general situation in which mass and to a
PAN molecular weight and flow curve of spinning solution were tested by high temperature GPC and senior rotary rheometer to study influence factors of rheological characteristic of spinning solution The re-sults show that molecular weight of PAN decreaseds and distribution narrowes with initiator concentration's in-creasesing At the temperature of 60 degrees celsius PAN/DMSO spinning
In this research the flow of Newtonian and drag reducing fluids through a helical tube i e Dean's flow was experimentally studied The primary concern was to investigate the effect of added polymer on the secondary motion caused by the centrifugal force
Free Online Library: Shear rheology and melt compounding of compatibilized-polypropylene nanocomposites: effect of compatibilizer molecular weight by Polymer Engineering and Science Engineering and manufacturing Science and technology general Colloid chemistry Analysis Polypropylene Chemical properties Mechanical properties Structure Rheology
CFD modeling of the effect of polymer elasticity on residual oil saturation at the pore-scale Ali Afsharpoora Matthew T Balhoffa n Roger Bonnecazeb 1 Chun Huha a Petroleum and Geosystems Engineering The University of Texas at Austin 1 University Station C0300 Austin TX 78712-0228 USA b Department of Chemical Engineering The University of Texas at Austin 1 University Station C0400
Rheological behaviour of polyurethane prepolymers as potting compound for hollow fibre haemodialyzer P P Lizymol M Jayabalan* Polymer Division Sree Chitra Thirunal Institute for Medical Sciences and Technology Poojappura Thiruvananthapur am 695 012 India Received 22 August 1996 accepted 22 October 1996 The effect of reaction conditions on the rheological behaviour of various
Secondary Newtonian viscosities η ∞ were identified between 2 10 6 − 7 10 6 1/s • η ∞ is related with weight average molecular weight M w as η ∞ = 1 1870 10 − 6 M w 1 0844 • Novel viscosity models were developed to describe measured flow data
Newtonian fluids Milad Khatibi Nikita Potokin and Rune W Time Chalmers University of Technology 41258 Gothenburg Sweden University of Stavanger Norway Simultaneous In-situ Analysis of Instabilities and First Normal Stress Difference during Polymer Melt Extrusion Flows Roland Kdr1 2 Ingo F C Naue2 and Manfred Wilhelm2 1 2 Karlsruhe Institute of Technology - KIT 76128 Karlsruhe
Notes about this lecture: – For high molecular weight polymers modulus drops to a secondary plateau region i e rubbery plateau • 3 Rubbery plateau – Results from the formation of entanglements in high molecular weight polymers – Modulus is inversely proportional to the molecular weight between entanglements M e – For semi-crystalline materials the modulus is higher • 4
Introducing Polyolefins 1 2 Content Importance of polyolefins Global consumption Domestic production and consumption Application Polyolefins family PE classification PP structures Key properties Additivation 3 Polyolefins: the most important synthetic polymers Global plastics production in 2013 approximately 300 Million tons Polyolefins represent 45% PVC 14% PS 7% PET 6% PUR 5% ABS
INVESTIGATIONS ON THE EFFECT OF APT AS A SECONDARY ACCELERATOR IN NR LATEX SYSTEMS Natural rubber latex obtained from Hauea brasiliensis is a colloidal dispersion of negatively charged rubber particles suspended in an aqueous medium It has a rubber content of 25-40 percent by weight which depends on the type of tree the tapping intensity soil condition season etc It is a
Recent studies have reported the roles of Hyaluronic acid (HA) chains of diverse length in wound repair especially considering the simultaneous occurrence in vivo of both high- (H-HA) and low-molecular weight (L-HA) hyaluronan at an injury site It has been shown that HA fragments (5 ≤ MW ≤ 20 kDa) usually trigger an inflammatory response that on one hand is the first signal in the
Lanhe Zhang and John M Torkelson Influence of initiator fragments as chain ends on the Tg-confinement effect and dewetting of thin films of ultralow molecular weight polymer Polymer 10 1016/j polymer 2015 03 056 65 (105-114) (2015)
1 Drop Formation and Breakup of Low Viscosity Elastic Fluids: Effects of Molecular Weight and Concentration V Tirtaatmadja1 G H McKinley2 and J J Cooper-White1* 1Particulate Fluids Processing Centre Department of Chemical and Biomolecular Engineering The University of
20 08 2015Hyaluronan's molecular weight in normal physiological conditions ranges from 1 10 5 to 1 10 7 whereas the low-molecular weight hyaluronan has relevance to inflammation and cancer The very high-molecular weight hyaluronan from naked mole rat (molecular weight 6 10 6 –1 2 10 7) has an anti-malignant activity
HAs exhibit unique viscoelastic properties with highly non-Newtonian characteristics that allow the synovial fluid to provide the fluid dynamic properties of lubrication as well as resistance to compression and shear forces Healthy synovial fluid is primarily composed of HA of high molecular weight but during the development of OA the concentration of HA drops and the average polymer length
Biodegradable polymers play a crucial role in the medical device field with a broad range of applications such as suturing drug delivery tissue engineering scaffolding orthopaedics and fixation devices Poly-l-lactic acid (PLLA) is one of the most commonly used and investigated biodegradable polymers The objective of this study was to determine the influence low shear microbore
Read Shear rheology and melt compounding of compatibilized‐polypropylene nanocomposites: Effect of compatibilizer molecular weight Polymer Engineering Science on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips
16 12 2019The effect of ethanol on oil‐in‐water emulsions stabilized with low molecular weight surfactants was investigated Oil‐in‐water emulsions were prepared containing varying percentages of ethanol and sunflower oil and stabilized with different emulsifiers (Tween 20 Tween 80 and Lecithin) Droplet size viscosity density and interfacial tension measurements were carried out The
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