Ultrasound-induced nucleation in microcellular polymers
نویسندگان
چکیده
منابع مشابه
Polarons as nucleation droplets in nondegenerate polymers.
We present a study of the nucleation mechanism that allows the decay of the metastable phase (trans-cisoid) to the stable phase (cis-transoid) in quasi one-dimensional non-degenerate polymers within the continuum electronphonon model. The electron-phonon configurations that lead to the decay, i.e. the critical droplets (or transition state), are identified as polarons of the metastable phase. W...
متن کاملPhenomenology of bubble nucleation in the solid-state nitrogen–polystyrene microcellular foams
Experimental results on bubble nucleation in the solid-state polystyrene–nitrogen system are presented. It was found that the bubble nucleation occurs over a period of approximately 30 s, and is not instantaneous as previously suggested. Over the range of nitrogen pressures explored, 4–14 MPa, the cell nucleation density increased exponentially. However this increase was many orders of magnitud...
متن کاملUltrasound assisted nucleation of water during freezing
Nucleation of ice during freezing is an important phenomenon affecting the probability distribution of the ice crystal size and crystal growth. Power ultrasound has been proved to be useful in promoting the nucleation of ice in water based solutions. In the present work, the use of ultrasound waves to induce dynamic nucleation was studied on deionized water, 8% sucrose solution, and agar gel sa...
متن کاملInhibition of bacterial ice nucleation by polyglycerol polymers.
The simple linear polymer polyglycerol (PGL) was found to apparently bind and inhibit the ice nucleating activity of proteins from the ice nucleating bacterium Pseudomonas syringae. PGL of molecular mass 750 Da was added to a solution consisting of 1 ppm freeze-dried P. syringae 31A in water. Differential ice nucleator spectra were determined by measuring the distribution of freezing temperatur...
متن کاملA Discrete Complex Compliance Spectra Model of the Nonlinear Viscoelastic Creep and Recovery of Microcellular Polymers
The present work reports a discrete stress-dependent, complex compliance spectra method that may be used to predict the mechanical response of nonlinear viscoelastic polymers during creep and recovery processes. The method is based on the observation that the real and imaginary parts of a discrete complex compliance frequency spectra obtained from creep and recovery measurements are smooth, eas...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Applied Polymer Science
سال: 2015
ISSN: 0021-8995
DOI: 10.1002/app.43079