scholarly journals Effect of polymer molecular weight on adsorption and suspension rheology

2016 ◽  
Vol 124 (4) ◽  
pp. 484-488 ◽  
Author(s):  
Ungsoo KIM ◽  
William Michael CARTY
Keyword(s):  
Molecular Weight ◽  
Suspension Rheology ◽  
Polymer Molecular Weight

The Effect of Polymers on Ceramic Suspension Rheology and Green Component Properties

1992 ◽  
Vol 289 ◽  
Author(s):  
Jennifer A. Lewis ◽  
Andrea L. Ogden ◽  
David Schroeder ◽  
Kirk J. Duchow
Keyword(s):  
Molecular Weight ◽  
Polymer System ◽  
Polyvinyl Butyral ◽  
Shear Thinning ◽  
Suspension Rheology ◽  
Low Molecular Weight ◽  
Polymer Molecular Weight ◽  
Green Component ◽  
Ceramic Suspensions ◽  
Packing Efficiency

AbstractCeramic suspensions were formulated based on an alumina/plasticized-polymer system. The total polymer volume in suspension was held constant, while the relative amount of high-to-low molecular weight polyvinyl butyral (PVB) in suspension was varied. Experiments were performed to elucidate the effects of polymer molecular weight and distribution on the rheological properties of these casting suspensions as well as on the green microstructure of tape-cast components. The polymer properties affected not only the suspension viscosity at a given shear rate as expected, but also the shear thinning behavior of each suspension. Tapes (thickness ≈ 250 μm) were cast from these suspensions and their properties were evaluated. Pore volume, a measure of the packing efficiency, was found to depend strongly on the polymer molecular weight and distribution. In addition, preliminary lamination studies revealed that dimensional stability and anisotropy were also affected by the relative amount of high-to-low molecular weight PVB. A direct correlation was shown to exist between the shear thinning behavior of these suspensions and the resulting dimensional anisotropy exhibited by the tapes cast from each of them. These results demonstrate that polymeric aids influence not only the suspension rheology, but the green component microstructure as well, and, hence, are an integral aspect of ceramic processing.

Crystallization of Isotactic Poly(propylene) in Solution as Followed by Slow Calorimetry

1995 ◽  
Vol 60 (11) ◽  
pp. 1905-1924 ◽  
Author(s):  
Hong Phuong-Nguyen ◽  
Geneviève Delmas
Keyword(s):  
Molecular Weight ◽  
Crystal Growth ◽  
High Temperature ◽  
Heat Of Fusion ◽  
Complete Dissolution ◽  
Polymer Molecular Weight ◽  
Solvent Quality ◽  
Temperature Ramp ◽  
Poly Propylene

Dissolution, crystallization and second dissolution traces of isotactic poly(propylene) have been obtained in a slow temperature ramp (3 K h-1) with the C80 Setaram calorimeter. Traces of phase-change, in presence of solvent, are comparable to traces without solvent. The change of enthalpy on heating or cooling, ∆Htotal, over the 40-170 °C temperature range, is the sum of two contributions, ∆HDSC and ∆Hnetwork. The change ∆HDSC is the usual heat obtained in a fast temperature ramp and ∆Hnetwork is associated with a physical network whose disordering is slow and subject to superheating due to strain. When dissolution is complete, ∆Htotal is equal to ∆H0, the heat of fusion of perfect crystals. The values of ∆Htota for nascent and recrystallized samples are compared. Dissolution is the tool to evaluate the quality of the crystals. The repartition of ∆Htotal, into the two endotherms, reflects the quality of crystals. The crystals grown more rapidly have a higher fraction of network crystals which are stable at high T in the solvents. A complete dissolution, i.e. a high temperature (170 °C or more) is necessary to obtain good crystals. The effect of concentration, polymer molecular weight and solvent quality on crystal growth is analyzed.

scholarly journals The Influence of Polymer Molecular Weight in Lamellar Gels Based on PEG-Lipids

1998 ◽  
Vol 75 (1) ◽  
pp. 272-293 ◽  
Author(s):  
Heidi E. Warriner ◽  
S.L. Keller ◽  
Stefan H.J. Idziak ◽  
Nelle L. Slack ◽  
Patrick Davidson ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Polymer Molecular Weight

Effects of drug and polymer molecular weight on drug release from PLGA-mPEG microspheres

2014 ◽  
Vol 132 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Shuibin Feng ◽  
Lei Nie ◽  
Peng Zou ◽  
Jinping Suo
Keyword(s):  
Molecular Weight ◽  
Drug Release ◽  
Polymer Molecular Weight

Optimisation of diketopyrrolopyrrole:fullerene solar cell performance through control of polymer molecular weight and thermal annealing

2014 ◽  
Vol 2 (45) ◽  
pp. 19282-19289 ◽  
Author(s):  
Zhenggang Huang ◽  
Elisa Collado Fregoso ◽  
Stoichko Dimitrov ◽  
Pabitra Shakya Tuladhar ◽  
Ying Woan Soon ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Solar Cells ◽  
Solar Cell ◽  
Thermal Annealing ◽  
Bulk Heterojunction ◽  
Cell Performance ◽  
Polymer Molecular Weight ◽  
Solar Cell Performance ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells

The performance of bulk heterojunction solar cells based on a novel donor polymer DPP-TT-T was optimised by tuning molecular weight and thermal annealing.

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