Cure Monitoring for Composites and Adhesives by D. Mulligan

By D. Mulligan

This record makes a speciality of in-line treatment tracking as a key manner of optimising construction. the majority of this evaluation is dedicated to assurance of the diversity of options used for healing tracking. those were grouped by way of the fabrics houses which are undefined: thermal, mechanical, electric, and optical. particular components coated contain approach modelling, off-line treatment evaluate and caliber coverage. during this part the writer additionally experiences the technical and useful concerns linked to many of the recommendations. an extra listed part containing a number of hundred abstracts from the Rapra Polymer Library database offers precious references for extra examining.

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Exposure time. This is useful to determine how fast a material will cure using a particular light source. Attenuated total reflectance (ATR) allows for the determination of % cure at a particular surface. This is useful for quantifying the degree of surface tack due to surface oxygen inhibition commonly seen in acrylates. It has been discovered that the degree on surface inhibition is related to the intensity of exposure. As the intensity increases, the amount of surface inhibition due to oxygen decreases.

8 refs. 67-77 REPAIR OF UNDERGROUND BURIED PIPES WITH RESIN TRANSFER MOULDING Dai Gil Lee; Woo Seok Chin; Jae Wook KKwon; Ae Kwon Yoo Korea,Advanced Institute of Science & Technology; TBI A new resin transfer moulding process was described for repairing and reinforcing underground pipes using fibrereinforced composite materials (a glass fibre-reinforced orthophthalic type unsaturated polyester). The interior of the pipe was cleaned using a mobile robot. The reparing reinforcement (consisting of a glass fibre preform and two covering plastic films) was connected to a rope, pulled through the pipe and both ends of the reinforcement were then closed.

22 refs. On-line mixing of thermoset prepolymers and curing agents is the main technique used commercially for the manufacture of composite parts. A disadvantage of this process is that the concentrations of curing agent are fixed throughout, causing the resin that is mixed with its curing agent earlier in the process to cure before the resin that enters the mould towards the end of the filling. This results in inhomogeneous gelation in the part. The results of the present study show that, by adjusting the concentrations of a set of retarder, accelerator and initiator for a vinyl ester resin, spatially homogeneous gelation can be achieved.

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