Microphase separation of short wormlike diblock copolymers with a finite interaction range

Soft Matter ◽  
2016 ◽  
Vol 12 (8) ◽  
pp. 2481-2490 ◽  
Author(s):  
Ying Jiang ◽  
Xinghua Zhang ◽  
Bing Miao ◽  
Dadong Yan ◽  
Jeff Z. Y. Chen
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Structural Properties ◽  
Diblock Copolymers ◽  
Microphase Separation ◽  
Low Molecular Weight ◽  
Interaction Range ◽  
High Molecular Weight Polymers

A study on the structural properties of low-molecular weight AB diblock copolymers indicates substantial deviations from the properties of high-molecular weight polymers.

Phase Behavior of Binary Blends of High Molecular Weight Diblock Copolymers with a Low Molecular Weight Triblock

2008 ◽  
Vol 41 (15) ◽  
pp. 5785-5792 ◽  
Author(s):  
Rafal A. Mickiewicz ◽  
Eleftherios Ntoukas ◽  
Apostolos Avgeropoulos ◽  
Edwin L. Thomas
Keyword(s):  
Molecular Weight ◽  
Phase Behavior ◽  
High Molecular Weight ◽  
Diblock Copolymers ◽  
Low Molecular Weight ◽  
Binary Blends

Microphase Separation in Low Molecular Weight Styrene-Isoprene Diblock Copolymers Studied by DSC and13C NMR

1980 ◽  
Vol 13 (1) ◽  
pp. 100-106 ◽  
Author(s):  
B. Morèse-Séguéla ◽  
M. St-Jacques ◽  
J. M. Renaud ◽  
J. Prod'homme
Keyword(s):  
Molecular Weight ◽  
Diblock Copolymers ◽  
Microphase Separation ◽  
Low Molecular Weight

Toxicological Considerations in the Selection of Flexible Packaging Materials for Foodstuffs

1977 ◽  
Vol 40 (1) ◽  
pp. 65-68 ◽  
Author(s):  
FRED B. SHAW
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Polymeric Films ◽  
Low Molecular Weight ◽  
High Molecular Weight Polymers ◽  
Flexible Packaging ◽  
Aseptic Packaging ◽  
Commercial Polymers ◽  
Metallic Foils ◽  
Molecular Weight Fractions

High molecular weight polymers are the “backbone” of the flexible packaging industry, although a variety of papers, fabrics, and metallic foils are also employed. Almost without exception, high molecular weight polymers are physiologically inert and, therefore, pose no toxicological problems in themselves. However, monomers and low molecular weight fractions that may be incorporated in certain commercial polymers can be a source of concern, as can be other low molecular weight chemicals purposely added to commercial polymers, in some instances, to modify their processing or functioning characteristics. Conditions of use must also be considered when employing polymeric films (with or without additives) as the food contact components of packages. A polymer may be completely nontoxic and an adequate barrier to other package constituents when used to contain foodstuffs if the resultant package is subsequently stored at room temperature, under refrigeration, or frozen. However, when used as the inner ply of a boil-in pouch, a retortable pouch, or an oven bag, it must be determined that it is not subject to some degree of thermal breakdown or allows permeation of adhesive or ink components not approved for direct contact with food. Finally, if there is a requirement to sterilize packages before filling, as in aseptic packaging, the effect of the sterilizing medium on the packaging material must be fully understood.

Investigation of the microphase separation transition in low-molecular-weight diblock copolymers

1989 ◽  
Vol 22 (8) ◽  
pp. 3380-3387 ◽  
Author(s):  
John N. Owens ◽  
Irena S. Gancarz ◽  
Jeffrey T. Koberstein ◽  
Thomas P. Russell
Keyword(s):  
Molecular Weight ◽  
Diblock Copolymers ◽  
Microphase Separation ◽  
Low Molecular Weight

The Effect of Dextran of Various Molecular Weight on the Coagulation in Dogs

1961 ◽  
Vol 06 (01) ◽  
pp. 015-024 ◽  
Author(s):  
Sven Erik Bergentz ◽  
Oddvar Eiken ◽  
Inga Marie Nilsson
Keyword(s):  
Molecular Weight ◽  
Body Weight ◽  
High Molecular Weight ◽  
Bleeding Time ◽  
Factor Vii ◽  
Low Molecular Weight ◽  
Factor V ◽  
Coagulation Mechanism ◽  
Coagulation Defects

Summary1. Infusions of low molecular weight dextran (Mw = 42 000) to dogs in doses of 1—1.5 g per kg body weight did not produce any significant changes in the coagulation mechanism.2. Infusions of high molecular weight dextran (Mw = 1 000 000) to dogs in doses of 1—1.5 g per kg body weight produced severe defects in the coagulation mechanism, namely prolongation of bleeding time and coagulation time, thrombocytopenia, pathological prothrombin consumption, decrease of fibrinogen, prothrombin and factor VII, factor V and AHG.3. Heparin treatment of the dogs was found to prevent the decrease of fibrinogen, prothrombin and factor VII, and factor V otherwise occurring after injection of high molecular weight dextran. Thrombocytopenia was not prevented.4. In in vitro experiments an interaction between fibrinogen and dextran of high and low molecular weight was found to take place in systems comprising pure fibrinogen. No such interaction occurred in the presence of plasma.5. It is concluded that the coagulation defects induced by infusions of high molecular weight dextran are due to intravascular coagulation.

Stereo-chemical contributions to the glass transition and liquid–liquid phase separation in high molecular weight poly(N-vinyl carbazole)

RSC Advances ◽  
2016 ◽  
Vol 6 (35) ◽  
pp. 29326-29333 ◽  
Author(s):  
Abdul G. Al Lafi ◽  
James N. Hay
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Phase Separation ◽  
Liquid Phase ◽  
High Molecular Weight ◽  
Structural Properties ◽  
Thermal History ◽  
Liquid Phase Separation ◽  
High Molecular Weight Poly ◽  
Liquid Liquid Phase Separation

Thermal history and purification effects on the structural properties of PVK were investigated. Liquid–liquid phase separation is suggested to occur by separation of isotactic rich segments from a matrix which is predominantly atactic.

Sign in / Sign up

Export Citation Format

Share Document