Search results for "Solidi"
showing 10 items of 26 documents
SEGREGATION CONTROL AT DIRECTIONAL SOLIDIFICATION USING MAGNETIC FIELD AND ELECTRIC CURRENT
2015
International audience
Parametri di traffico urbano nella raccolta differenziata dei rifiuti solidi urbani
1996
Structure and Morphology Control in Polymer Forming Through the Thermal History
2011
Two examples of the application of the Continuous Cooling Transformation (CCT) method for investigating polymer solidification under processing conditions are illustrated. One example concerns the solidification behaviour of syndiotactic polystyrene (sPS) from the melt, showing an anomalous trend of density versus cooling rate, exhibiting a minimum around 1 °C/s. Once phase composition is obtained from WAXD deconvolution, density can be closely predicted, its minimum depending on the competition among crystalline phases upon increasing cooling rate. Another example regards the formation of Poly-Left Lactic Acid (PLLA) foams via Thermally Induced Phase Separation (TIPS) by starting from ther…
Polymer Solidification under Pressure and High Cooling Rates
2000
Abstract Polymer solidification under processing conditions is a complex phenomenon in which the kinetics of flow, high thermal gradients and high pressures determine the product morphology. The study of polymer structure formed under pressure has been mainly made using conventional techniques such as dilatometry and differential scanning calorimetry under isothermal conditions or non isothermal conditions but at cooling rates several orders of magnitude lower than those experienced in industrial processes. A new equipment has been recently developed and improved to study the crystallization of polypropylene when subjected to pressure and cooled rapidly. An experimental apparatus essentiall…
Structure development in poly(ethylene terephthalate) quenched from the melt at high cooling rates: X-ray scattering and microhardness study
2000
The structure and microhardness of poly(ethylene terephthalate) (PET) cooled from the melt, using a wide range of cooling rates, was studied. PET thin films rapidly cooled from the melt (cooling rates larger than 5°C/s) show a continuous variation of structure and properties depending on cooling rate. Results highlight differences in the micro-mechanical properties of the glass suggesting the occurrence of amorphous structures with different degrees of internal chain ordering. The comparative X-ray scattering study of two glassy PET samples (7500 and 17°C/s) reveals the occurrence of frozen-in electron density states giving rise to an excess of scattering for the amorphous sample solidified…
DAL CONTESTO EUROPEO ALLE CITTÀ ITALIANE. RIFERIMENTI NORMATIVI E ORIENTAMENTI PROGRAMMATICI
2019
Esiste una cospicua letteratura internazionale dedicata alle possibili modalità di gestione dei flussi di risorsa urbani. In ambito comunitario gli studi che possono essere considerati un riferimento sono quelli promossi dalla Commissione Europea. Sui risultati di questi studi è in larga parte fondata l’attuale politica di gestione dei servizi urbani che prevede una gerarchia di principi gestionali mettendo al primo posto la riduzione della produzione degli scarti alla fonte, seguita dal riuso, dal riciclo di materiali, dal recupero indiretto di energia o materiali secondari e solo come estrema soluzione, lo smaltimento in discarica. Particolare attenzione, inoltre, è posta sulla trasformaz…
Qualità pomologica e sensoriale di 10 varietà di mango (Mangifera indica L.) coltivate in Sicilia
2015
Il mango (Mangifera indica L.) è una pianta arborea originaria della regione Indo-Burmese, che appartiene botanicamente alla famiglia delle Anacardiaceae, principalmente coltivata nei paesi a clima tropicale e subtropicale ed oggi, complice il cambiamento climatico, diffusa anche nel bacino del mediterraneo. In Italia il mango viene coltivato solo in Sicilia dove areali della costiera tirrenica hanno fatto registrare produzioni di pregio e una crescente diffusione di nuove cultivar provenienti dai luoghi di origine. Limiti vegetazionali piuttosto stretti, soprattutto in termini di minime termiche stagionali, hanno, in passato, causato l’insuccesso di numerosi nuovi impianti basati sull’intr…
INFLUENCE OF PLASTICIZERS ( OR EXCESS FREE VOLUME ) ON SEMI-CRYSTALLINE POLYESTER BLEND SOLIDIFICATION UNDER PROCESSING CONDITIONS.
2011
The solidification behavior of a PBT/PET blend over a wide range of cooling rate
2009
In recent years, much attention has been paid to the development of high-performance polyester blends, among which blends of polybutylene terephtha- late/polyethylene terephthalate (PBT/PET) are expected to exhibit remarkable prop- erties as far as their crystallization behavior is concerned. Through trial and error, appropriate commercial compositions have been chosen which could not be otherwise explained by a suitable interpretation of the mechanisms determining their solidifica- tion behavior. The solidification behavior of a 60/40 w/w PBT/PET blend was studied in a wide range of cooling conditions, according to a continuous cooling transforma- tion (CCT) procedure developed previously,…