Liquid Carboxyl-Terminated Poly(Butadiene)

1973 ◽  
Vol 46 (1) ◽  
pp. 139-147 ◽  
Author(s):  
R. F. Hoffman ◽  
R. H. Gobran
Keyword(s):  
Physical Properties ◽  
Aromatic Amines ◽  
Chain Extension ◽  
Moderate Amount ◽  
Polymer Systems ◽  
Liquid Polymer ◽  
Reinforcing Fillers ◽  
Curing Agents ◽  
Cure Reactions ◽  
Chromium Salt

Abstract In general HC-434 is a relatively homogeneous, difunctional polymer that can be readily chain extended through a variety of cure reactions. To date most of the work has been done with epoxide and aziridinyl curing agents, and a moderate amount of work has been done to improve the rates of cure by means of catalysts. Both aromatic amines and chromium salt complexes have proven to be effective catalysts. The physical properties of the chain-extended polymer with reinforcing fillers approach those of SBR vulcanizates, but improvement is still needed to achieve the properties required for tire formulations. The liquid polymer systems are suitable for belting, hose, and molding applications. However, additional work is required to develop the optimum cure systems for physical properties, faster catalysts, and alternative chain-extension reactions with other reactive curing agents.

scholarly journals New polymer systems: chain extension by dianhydrides

Polymer ◽  
1973 ◽  
Vol 14 (10) ◽  
pp. 466-468 ◽  
Author(s):  
R.A. Rhein ◽  
J.D. Ingham
Keyword(s):  
Chain Extension ◽  
Polymer Systems

Rotational Moulding of Liquid Polymers

1996 ◽  
Vol 210 (5) ◽  
pp. 437-447 ◽  
Author(s):  
E Harkin-Jones ◽  
R J Crawford
Keyword(s):  
Ring Opening ◽  
Material Handling ◽  
Bubble Formation ◽  
Rotational Moulding ◽  
Polymer Systems ◽  
Moulding Process ◽  
Cycle Times ◽  
Liquid Polymer ◽  
Liquid Polymers ◽  
Rotationally Moulded

The vast majority of rotationally moulded articles are produced from powdered polymers. However, the moulding process developed originally from the use of liquid polymers and nowadays there is a renewed interest in such systems because of some unique advantages that they offer. This paper compares the behaviour of three different liquid polymer systems—nylon 6 by ring-opening caprolactam, polyvinyl chloride plastisol and polyurethane. The flow behaviour of each material is examined with particular reference to wall thickness distributions and bubble formation in the product. On the basis of this, criteria for the production of fault-free mouldings have been established. The interrelationships between mould shape and resin viscosity are also examined and an ideal viscosity—time—temperature profile is proposed for liquid polymer systems. Finally, a general comparison of the materials is made with regard to material handling, safety, cycle times, etc.

Structure-based coarse-graining for inhomogeneous liquid polymer systems

2013 ◽  
Vol 139 (5) ◽  
pp. 054901 ◽  
Author(s):  
Motoo Fukuda ◽  
Hedong Zhang ◽  
Takahiro Ishiguro ◽  
Kenji Fukuzawa ◽  
Shintaro Itoh
Keyword(s):  
Coarse Graining ◽  
Polymer Systems ◽  
Liquid Polymer

Some studies on the effect of bagasse concentration on the mechanical and physical properties of SBR composites

2020 ◽  
Vol 28 (8-9) ◽  
pp. 663-677
Author(s):  
ESA Khalaf ◽  
H Farag ◽  
EM Abdel-Bary
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Agricultural Waste ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
The Road ◽  
Reinforcing Fillers ◽  
Mechanical And Physical Properties ◽  
Grinding Machine ◽  
Styrene Butadiene

This work aims to avoid pollution of the environment resulting from ashes accumulated due to the burning of agricultural wastes. Also, it aims to reduce the cost without impairing the mechanical properties of rubber vulcanizates. For this reason, this work was carried out as a possible solution by incorporation of cellulose fibers derived from bagasse waste as reinforcing fillers in rubber composites. Besides, it aims at reporting an investigation on a series of mixtures based on natural ground bagasse powder (GBP) and carbon black (CB) as reinforcing fillers to study their effects on the mechanical and physical properties of styrene butadiene rubber (SBR) composites. The GBP obtained from the grinding machine has a selective grain size distribution ranging from about 20 µm to 180 µm. In addition, 2.5 phr of added maleic anhydride was used to improve the interfacial adhesion between SBR and agricultural waste fillers (i.e. bagasse). Tensile strength, elongation at break, modulus at 100% elongation, resilience and hardness (Shore A), degree of swelling, and thermal properties of the rubber vulcanizates were studied. The prepared samples were also analyzed by X-ray diffractometer and scanning electron microscopy. The advantage of choosing the 25 phr bagasse concentration as a pivoting factor makes the road clearer to investigate that the optimum concentration of bagasse to be used simultaneously with CB in SBR composites is 30 phr. Furthermore, it was found from the obtained results that the addition of GBP up to 50 phr is possible without impairing the mechanical properties of SBR vulcanizates.

Studies of the Physical Properties of Cycloaliphatic Epoxy Resin Reacted with Anhydride Curing Agents

2017 ◽  
Vol 737 ◽  
pp. 248-255 ◽  
Author(s):  
Tae Hee Kim ◽  
Dae Yeon Kim ◽  
Choong Sun Lim ◽  
Bong Kuk Seo
Keyword(s):  
Physical Properties ◽  
Reaction Kinetics ◽  
Epoxy Resin ◽  
High Performance ◽  
Industrial Applications ◽  
Scanning Calorimetry ◽  
Low Viscosity ◽  
High Performance Polymer ◽  
Curing Agents ◽  
The Impact

The preparation of high performance epoxy composites for industrial applications has been extensively researched. In this report, we study the change in physical properties and reaction kinetics between epoxy resin and curing agents of similar geometry. For the experiments, celloxide 2021P, an epoxy resin having low viscosity, was blended with three different curing agents: methylhexahydropthalic acid, methyltetrahydropthalic acid, and 5-norbornene-2, 3-dicarboxylic anhydride. The amount of 1, 2-dimethylimidazole catalyst was controlled, and the highest heat flow temperature (Tpeak) was observed at around 145 °C. The impact on reaction kinetics relative to the change in heating rate was studied with differential scanning calorimetry (DSC) for each of the curing agents. The glass transition temperature (Tg) of each composition was measured with a second DSC cycle. The prepared epoxy compositions were thermally cured in a metallic mold to provide pure epoxy resins without fillers. Finally, the flexural strengths of these resins were compared to each other. The authors believe that insights into choosing an appropriate epoxy binder are useful when it comes to the overall preparation of high performance polymer composites.

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