Polymer characterization by ultrasonic wave propagation

• DOI: 10.1002/adv.20124
• Publication Date: 2010-07-09T11:21:31Z
• Authors: Francesca Lionetto; Alfonso Maffezzoli
• Keywords: Characterization

Abstract The propagation of low‐intensity ultrasound in polymers, acting as a high‐frequency dynamic mechanical deformation, can be successfully used to monitor changes the modulus polymers associated with glass transition, crystallization, cross‐linking, and other chemical physical phenomena related viscoelastic behavior, such gelation phenomena. velocity sound is polymer storage density, whereas absorption ultrasonic waves energy dissipation material and, therefore, loss modulus. Accordingly, measurements have been by several authors evolution moduli function time or temperature recently, become characterization technique its own right, generally known analysis (UDMA). Often conjunction rheological methods means providing better insight into behavior systems. As yet UDMA underutilized primarily because low operating temperatures (usually below 100○C) commercially available transducers, also due requirement coupling medium ensure an efficient transfer mechanism between transducer test material. Despite these limitations, this paper shows that use ultrasonics potentially powerful method for particularly tool online monitoring events occurring during processing manufacture matrix composites. aim review progress made recent years, highlighting potential reliability transitions melting, well taking place curing thermosetting resins. © 2009 Wiley Periodicals, Inc. Adv Polym Techn 27:63–73, 2008; Published InterScience ( www.interscience.wiley.com ). DOI 10.1002/adv.20124