Polypropylene Oxide. IV. Preparation and Properties of Polyether Networks

1967 ◽  
Vol 40 (5) ◽  
pp. 1421-1425
Author(s):  
G. Allen ◽  
H. G. Crossley
Keyword(s):  
Energy Density ◽  
Natural Rubber ◽  
Physical Properties ◽  
Propylene Oxide ◽  
Cohesive Energy ◽  
Dynamic Properties ◽  
Point Of View ◽  
Polypropylene Oxide ◽  
Cohesive Energy Density

Abstract Stable vulcanizates of copolymers of propylene oxide and butadiene monoxide have been prepared and some physical properties studied. The cohesive energy density of a copolymer containing 84 per cent propylene oxide is determined from swelling measurements to be 83 cal cm−. The dynamic properties of the copolymer are similar to those of natural rubber. From a thermodynamic point of view the copolymer is more ideal in its rubbery behavior than natural rubber.

The study of natural rubber/polybutadiene rubber hybrid matrix-based magnetorheological elastomer

2019 ◽  
pp. 089270571987822
Author(s):  
Xincheng Song ◽  
Wenju Wang ◽  
Fufeng Yang ◽  
Guoping Wang ◽  
Xiaoting Rui
Keyword(s):  
Energy Density ◽  
Natural Rubber ◽  
Cohesive Energy ◽  
Md Simulation ◽  
Magnetic Particles ◽  
Homogeneous System ◽  
Magnetorheological Elastomer ◽  
Cohesive Energy Density ◽  
Hybrid Matrix ◽  
Polybutadiene Rubber

Magnetorheological elastomer (MRE) that consists of matrix materials and magnetic particles is a kind of smart material, whose mechanical properties were controllable under external magnetic field. In this work, natural rubber (NR)/polybutadiene rubber (BR) hybrid matrix-based MRE was prepared. The compatibility of NR and BR was studied by experiment and molecular dynamic (MD) simulation. The hybrid matrix was prepared using the physical mixing method. The characterization results showed that BR had excellent compatibility with NR. The measurement result using rheometer showed that the MR effect can be increased to 44.19% by the addition of BR. Dynamic mechanical analysis showed that the hybrid matrix formed a homogeneous system when the ratio of BR and NR is 1:9 and 3:7. The MD simulation showed that the BR and NR are compatible and the cohesive energy density of hybrid matrix was smaller than BR and NR. The cohesive energy density of hybrid matrix was increased with the increase of BR.

Liquid Structure, Thermodynamics, and Mixing Behavior of Saturated Hydrocarbon Polymers. 1. Cohesive Energy Density and Internal Pressure

1998 ◽  
Vol 31 (20) ◽  
pp. 6991-6997 ◽  
Author(s):  
Janna K. Maranas ◽  
Maurizio Mondello ◽  
Gary S. Grest ◽  
Sanat K. Kumar ◽  
Pablo G. Debenedetti ◽  
...  
Keyword(s):  
Energy Density ◽  
Internal Pressure ◽  
Cohesive Energy ◽  
Saturated Hydrocarbon ◽  
Liquid Structure ◽  
Cohesive Energy Density ◽  
Mixing Behavior ◽  
Hydrocarbon Polymers

The Interaction between Rubber and Liquids. III. The Swelling of Vulcanized Rubber in Various Liquids

1943 ◽  
Vol 16 (2) ◽  
pp. 263-267 ◽  
Author(s):  
G. Gee
Keyword(s):  
Energy Density ◽  
Cohesive Energy ◽  
Molecular Volume ◽  
Substantial Agreement ◽  
Swelling Power ◽  
Cohesive Energy Density ◽  
Vulcanized Rubber ◽  
A Value

Abstract The entropy of swelling of vulcanized rubber is estimated, and assumed independent of the nature of the swelling liquid. The heat of swelling is related to the cohesive energy of the liquid, and a value of 66 calories per cc. deduced for the cohesive energy density of rubber. The swelling power of a liquid can be calculated approximately if its cohesive energy and molecular volume are known. Substantial agreement with theory is found in most cases, although it is necessary to consider aliphatic and aromatic liquids separately. The anomalously high swelling power of acids and alcohols arises from their association.

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