Studies on a New Vulcanization Syste

Studies on the chemistry of vulcanization” play a central role in the efforts to achieve better product performance from natural and synthetic rubbers. They provide rubber technologists with an increasingly realistic picture of molecular framework of vulcanizates, from which relation between physical properties and chemical constitution may be deduced. Moreover, these studies are also aimed at the understanding of the vulcanization process, in sufficiently advanced chemical mechanistic terms, so that the effect of changes on vulcanizate structure can rationally be predicted.“ The study of accelerator activity ofthe binary system containing ATU with TMTD, and with MBTS in sulphur vulcanization of dry natural rubber using standard procedures for compounding and vulcanization is described in the third chapter. The study of the gum vulcanizates form part I of this chapter The behaviour of the experimental mixes were compared with those of the controls containing thiourea; diphenyl guanidine

New accelerator system for low temperature curing of elastomers with special reference to NR, NBR and NR/BR blends

The primary objective of this work is to develop an efficient accelerator system for low temperature vulcanization of rubbers. Although xanthates are known to act as accelerators for low temperature vulcanization, a systematic study on the mechanism of vulcanization, the mechanical properties of the vulcanizates at varying temperatures of vulcanization, cure characteristics etc are not reported. Further. xanthate based curing systems are not commonly used because of their chance for premature vulcanization during processing. The proposed study is to develop a novel accelerator system for the low temperature vulcanization of rubbers having enough processing safely. lt is also proposed to develop a method for the prevulcanisation of natural rubber latex at room temperature. As already mentioned the manufacture of rubber products at low temperature will improve its quality and appearance. Also, energy consumption can be reduced by low temperature vulcanization. in addition, low temperature vulcanization will be extremely useful in the area of repair of defective products, since subjecting finished products to high temperatures during the process of repair will adversely affect the quality of the product. Further. room temperature curing accelerator systems will find extensive applications in surface coating industries.

Content Based Image Retrieval System for Malayalam Handwritten Characters

Content Based Image Retrieval is one of the prominent areas in Computer Vision and Image Processing. Recognition of handwritten characters has been a popular area of research for many years and still remains an open problem. The proposed system uses visual image queries for retrieving similar images from database of Malayalam handwritten characters. Local Binary Pattern (LBP) descriptors of the query images are extracted and those features are compared with the features of the images in database for retrieving desired characters. This system with local binary pattern gives excellent retrieval performance