Results 221 to 230 of about 22,448 (261)
Some of the next articles are maybe not open access.
Crosslink density in polybutadiene
Journal of Polymer Science, 1958AbstractThe crosslink density in polybutadiene has been determined by measurement of the polymer molecular weight by osmometry and the primary chain molecular weight by modifier analysis involving radioactive materials. Since the number of polymer molecules is equal to the number of primary chains less the number of crosslinkages, the experimental ...
L. H. Howland +3 more
openaire +1 more source
Polymer, 1986
Abstract Electron microscopy studies of crosslinked polyethylenes show that with increasing crosslinking conventional superstructures, their nucleation density and the nature of lamellae are greatly modified. With increasing crosslinking, the growth of spherulites is suppressed producing sheaves and ultimately bundles of lamellae.
R.M. Gohil, P.J. Phillips
openaire +1 more source
Abstract Electron microscopy studies of crosslinked polyethylenes show that with increasing crosslinking conventional superstructures, their nucleation density and the nature of lamellae are greatly modified. With increasing crosslinking, the growth of spherulites is suppressed producing sheaves and ultimately bundles of lamellae.
R.M. Gohil, P.J. Phillips
openaire +1 more source
Determination of effective crosslink density in silicone rubber
Journal of Applied Polymer Science, 1965Abstract As a result of the investigations reported here, a simple and precise method was evised to measure the compression-deflection of solvent-swollen silicone rubber. The method was found to be reliable, and the resultant data were used to calculate effective crosslink densities of solid and cellular silicone rubber compounds.
Robert D. Seeley, George W. Dyckes
openaire +1 more source
Crosslink density and fracture toughness of epoxy resins
Journal of Materials Science, 1991A series of networks of diverse crosslink density were prepared using bifunctional epoxide prepolymers of different molecular weight, crosslinked with diamine diphenyl sulphone, and their fracture behaviour investigated. The same set of resins was also modified with a reactive rubber.
G. Levita +3 more
openaire +1 more source
The Dependence of Dielectric Properties on Crosslink Density of Rubbers
Rubber Chemistry and Technology, 1975Abstract The dielectric properties of natural rubber, synthetic polyisoprene, andpolybutadiene samples crosslinked with sulfur and of natural rubber samplescrosslinked simultaneously with sulfur and dicumyl peroxide were studied. Inthe investigated systems, the number of polar groups in unit volume and thecrosslink density may be changed ...
R. Bakule, A. Havránek
openaire +1 more source
Research Journal of Chemistry and Environment, 2021
In this study, we report the synthesis and characterization of polymer hydrogels. The polymer gels have been prepared from acrylic acid (AA) monomer using allyl pentaerythritol as the crosslinker in the presence of potassium persulfate initiator. The synthesized polymer gels have been characterized by Fourier-transform infrared (FT-IR) spectroscopy ...
Anamica ., Poorn Prakash Pande
openaire +1 more source
In this study, we report the synthesis and characterization of polymer hydrogels. The polymer gels have been prepared from acrylic acid (AA) monomer using allyl pentaerythritol as the crosslinker in the presence of potassium persulfate initiator. The synthesized polymer gels have been characterized by Fourier-transform infrared (FT-IR) spectroscopy ...
Anamica ., Poorn Prakash Pande
openaire +1 more source
Crosslinking density and resorption of dimethyl suberimidate‐treated collagen
Journal of Biomedical Materials Research, 1997Collagen was purified from bovine Achilles tendon and crosslinked with dimethyl suberimidate (DMS) and glutaraldehyde (GTA). Under optimal conditions, the shrinkage temperature (Ts) was raised to 74 degrees C for collagen crosslinked with DMS and to 80 degrees C for those crosslinked with GTA.
V, Charulatha, A, Rajaram
openaire +2 more sources
Determination of the Crosslinking Density of a Silicone Elastomer
Journal of Chemical Education, 2019A laboratory experiment for the determination of the cross-linking density of silicone elastomers is described on the basis of swelling experiments and mechanical tests. In the experiment, the macroscopic swelling and mechanical behaviors of the elastomers were discussed as a function of the cross-linking density, which can be easily controlled by ...
Julie Schweitzer +4 more
openaire +1 more source
Chemically crosslinked high‐density polyethylene
Journal of Applied Polymer Science, 1969AbstractChemical crosslinking of high‐density polyethylene was studied. The amount of gel produced by a given peroxide concentration depends on the molecular weight of the polymer. More scission reactions, during the crosslinking process, occur in low‐density than in high‐density polyethylene crosslinked with Varox and Luperox 130 peroxides.
Moshe Narkis, Joseph Miltz
openaire +1 more source
Angewandte Chemie, 2020
AbstractThe chemical structures and topologies of the crosslinks in supramolecular networks play a crucial role in their properties and functions. Herein, the preparation of a type of poly(N‐isopropylacrylamide) (PNIPAAM)‐based supramolecular networks crosslinked by emissive hexagonal metallacycles is presented.
Ponmani Jeyakkumar +9 more
openaire +2 more sources
AbstractThe chemical structures and topologies of the crosslinks in supramolecular networks play a crucial role in their properties and functions. Herein, the preparation of a type of poly(N‐isopropylacrylamide) (PNIPAAM)‐based supramolecular networks crosslinked by emissive hexagonal metallacycles is presented.
Ponmani Jeyakkumar +9 more
openaire +2 more sources