Kinetics and Cure Mechanism in Aromatic Polybenzoxazines Modified Using Thermoplastic Oligomers and Telechelics

2014 ◽  
Vol 47 (6) ◽  
pp. 1935-1945 ◽  
Author(s):  
Ian Hamerton ◽  
Lisa T. McNamara ◽  
Brendan J. Howlin ◽  
Paul A. Smith ◽  
Paul Cross ◽  
...  
Keyword(s):  
Cure Mechanism

Observations on the use of Trichostrongylus colubriformis (Nematoda) infections of guinea-pigs for laboratory experiments

Parasitology ◽  
1963 ◽  
Vol 53 (1-2) ◽  
pp. 189-199 ◽  
Author(s):  
R. F. Sturrock
Keyword(s):  
Multivariate Analysis ◽  
Guinea Pigs ◽  
Worm Burden ◽  
Laboratory Experiments ◽  
Statistical Treatment ◽  
Post Mortem ◽  
Infective Larvae ◽  
Final Weight ◽  
Cure Mechanism ◽  
Experimental Use

Four groups of guinea-pigs were infected with a range of doses of T. colubriformis. The infections were followed by egg counts and weight measurements, and the adult worms were recovered from the animals post mortem. A multivariate analysis, details of which are given in an appendix, showed that the sensitivity of the measures used was, in descending order, final weight, total egg count and worm burden. The course of the infection is discussed in view of the apparent self-cure mechanism. Precautions are outlined for the experimental use of this hostparasite relationship.The author is grateful to Professor B. G. Peters for his advice on this work, to Dr P. Silverman of Allen and Hanburys Limited for a supply of T. colubriformis infective larvae and to Dr R. E. Blackith for his advice on the statistical treatment of the data.

Cure mechanism and thermal properties of the phthalide-containing bismaleimide/epoxy system

2013 ◽  
Vol 559 ◽  
pp. 52-58 ◽  
Author(s):  
Xuhai Xiong ◽  
Ping Chen ◽  
Rong Ren ◽  
Fang Lu ◽  
Qi Yu
Keyword(s):  
Thermal Properties ◽  
Epoxy System ◽  
Cure Mechanism

The effect of host lactation on a second infection of Nippostrongylus brasiliensis in rats

Parasitology ◽  
1972 ◽  
Vol 64 (2) ◽  
pp. 229-233 ◽  
Author(s):  
R. M. Connan
Keyword(s):  
Research Council ◽  
Technical Assistance ◽  
Agricultural Research ◽  
The Self ◽  
Nippostrongylus Brasiliensis ◽  
Essential Factor ◽  
Infective Larvae ◽  
The Third ◽  
Agricultural Research Council ◽  
Cure Mechanism

Rats were infected with 1000 larvae at the time of mating and they were given a second infection while suckling a new-born litter some 3½ weeks later. Although they did have significantly more worms than immune controls such rats were nevertheless highly resistant to challenge with infective larvae. However, when challenged with adult worms, immunized lactating rats were unable to eliminate the second infection.That the failure of self-cure in this case was not because adult worms are less antigenic in lactating rats was shown in the third experiment. Lactating rats were immunized by infection either with adult worms only or with larvae allowed to complete their life-cycle. When subsequently challenged with infective larvae during the same lactation, both groups were equally resistant. It is therefore concluded that in lactating rats the gut phase of N. brasiliensis infection is in some way protected from the self-cure mechanism. This may be due either to absence of an essential factor operating late in the process, or to the presence of a potentiating factor which allows the worms to survive.The author would like to thank Professor W. I. B. Beveridge in whose Department this work was carried out, and the Agricultural Research Council for their financial assistance. It is also a pleasure to acknowledge the technical assistance of Mr J. A. Wilson and Mr P. W. Holmes.

Hybrid organic/inorganic coatings produced using a dual-cure mechanism

2012 ◽  
Vol 9 (4) ◽  
pp. 423-431 ◽  
Author(s):  
Jie He ◽  
Bret J. Chisholm ◽  
Bret A. Mayo ◽  
Hanzhen Bao ◽  
Jared Risan ◽  
...  
Keyword(s):  
Inorganic Coatings ◽  
Cure Mechanism

Thermoanalytical Methods in Vulcanizate Analysis I. Differential Scanning Calorimetry and the Heat of Vulcanization

1975 ◽  
Vol 48 (1) ◽  
pp. 26-40 ◽  
Author(s):  
D. W. Brazier ◽  
G. H. Nickel
Keyword(s):  
Differential Scanning Calorimetry ◽  
Natural Rubber ◽  
Magnesium Oxide ◽  
Significant Contribution ◽  
Scanning Calorimetry ◽  
Future Studies ◽  
Sulfur Vulcanization ◽  
Cure Mechanism ◽  
Soft Rubber ◽  
Made In

Abstract Our objective has been to demonstrate that DSC is a convenient and rapid technique for the study of elastomer vulcanization characteristics. Although we have been concerned only with NR and NR-BR blends, the observation of exothermicity in sulfur vulcanization is quite general. Similar observations on sulfur vulcanization of IIR, SBR, EPDM, CSM, and NBR rubbers have been made in our laboratory. In non-sulfur vulcanization systems, we have found the diurethane cure of natural rubber to be exothermic and amenable to DSC study. As reported by Bruce et al., the magnesium oxide cure of chloroprenes is exothermic, but magnesium oxide-diamine vulcanization of fluoroelastomers is characterized by very low exothermicity. Future studies of the effect of various additives on soft rubber cure could make a significant contribution to our understanding of the complex cure mechanism. Successful kinetic analysis of DSC scans is perhaps the major hurdle to be overcome before the DSC technique can be meaningfully applied to such problems.

Structural Investigations and Monitoring of Polymerisation by NIR Spectroscopy

1998 ◽  
Vol 6 (1) ◽  
pp. 299-306 ◽  
Author(s):  
Gilbert Lachenal
Keyword(s):  
Hydrogen Bonding ◽  
Water Content ◽  
Physical State ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Relevant Information ◽  
Degree Of Cure ◽  
Structural Investigations ◽  
Mechanism Of Reaction ◽  
Cure Mechanism

Near infrared (NIR) spectra can give relevant information on the chemical and physical state of polymers and polymeric composites. Degree of cure, mechanism of reaction, crystallinity, orientation, water content and hydrogen bonding can be studied using NIR spectra without any sophisticated mathematical treatments. Some NIR applications are reviewed.

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