Tetra Schiff bases were used as thermal stabilizers to enhance the properties of polyvinyl chloride (PVC) when operated at high temperatures. The stability PVC films doped with was tested by weight-loss method, Fourier transform infrared (FTIR) spectroscopy, aging test, optical microscope, and atomic force microscope (AFM). Results showed that embedding these additives increased time polymer, w...

This report describes the construction technique for a simple and inexpensive cuff occluder for various size blood vessels. The occluder is made from polyvinyl chloride tubing and consist of two main parts, the balloon and catheter section, and the reinforcing back section. The occluders have functioned reliably in chronic dog preparations for up to 3 mo.

Occupational asthma due to the pyrolysis products of polyvinyl chloride (PVC) produced by shrink wrapping processes has previously been reported. The first case of occupational asthma in a shrink wrap worker using a different plastic, polyethylene, is reported; the association was confirmed by specific bronchial provocation testing.

One of the major environmental threats is the least rate of degradation or non biodegradability of the organic materials under natural condition, e.g. plastics. The plastics of various forms such as nylon, polycarbonate, polyethylene-terephthalate, polyethylene, polypropylene, polystyrene, polytetraflouro ethylene, polyurethane and polyvinyl chloride (Smith, 1964) are being continuously used in...

The color stability of polyvinyl chloride, polyurethane, and silicone polymers for maxillofacial applications was determined after accelerated aging using reflectance spectrophotometry. On the basis of color stability after accelerated aging, and ease of processing, several silicone materials were the most promising.

The design of an oesophageal cannula for goats, sheep and cattle is described. The cannula consists of a base, threaded bar and stopper made of polyvinyl chloride (PVC) or wood. The surgical procedure in goats for inserting the cannula is described as well as how to keep the wound around the cannula clean.