Παραγωγή πολυεστέρων με βάση το φουρανοδιικό οξύ : Ενζυμικός προπολυμερισμός και μεταπολυμερισμός τήγματος

Πλάγγεση, Ουρανία; Plangesi, Ourania

dc.contributor.author	Πλάγγεση, Ουρανία	el
dc.contributor.author	Plangesi, Ourania	en
dc.date.accessioned	2024-09-03T06:27:28Z
dc.date.available	2024-09-03T06:27:28Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/60094
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.27790
dc.rights	Default License
dc.subject	Φουρανικοί πολυεστέρες	el
dc.subject	Πολυ(φουρανοδιικός βουτυλεστέρας)	el
dc.subject	Ενζυμικός πολυμερισμός	el
dc.subject	Μεταπολυμερισμός τήγματος	el
dc.subject	Παραγωγή πολυμερών	el
dc.subject	Alipharomatic polyesters	en
dc.subject	Melt post-polymerization	en
dc.subject	Enzymatic polymerization	en
dc.subject	Poly(butylene 2,5-furan dicarboxylate)	en
dc.subject	Polymer production	en
dc.title	Παραγωγή πολυεστέρων με βάση το φουρανοδιικό οξύ : Ενζυμικός προπολυμερισμός και μεταπολυμερισμός τήγματος	el
heal.type	bachelorThesis
heal.classification	Μηχανική Πολυμερών	el
heal.language	el
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2024-03-01
heal.abstract	The impact of plastic use on the environment and humans has driven the scientific community to search for ways to achieve a more sustainable production process. Based on the Green Chemistry Principles, research has turned to new polymers, such as furan polyesters, and more environmentally friendly synthesis methods, like enzymatic polymerization. Thus, in this work, the enzymatic pre-polymerization of poly(butylene 2,5-furan dicarboxylate) (PBF) using the commercially available enzyme Novozyme 435 and its further upgrade by melt post-polymerization is studied. Specifically, in the first part of the study, enzymatic polymerization is investigated, with the aim of designing a truly green, solventless and low temperature process. A two-step process is thus proposed, the first of which takes place at 50°C and atmospheric pressure for 24 hours and is intended for enzymatic synthesis at low temperature. The second stage aims to promote chemical equilibrium by increasing the temperature and decreasing the pressure, so its conditions (temperature, pressure, reaction time) are the subject of investigation. Therefore, it is concluded that the optimum conditions are 2 hours at a temperature of 90°C and a pressure of 200 mbar. Hence, a product with a mass of 1.2 g was obtained, which contained monomer residues. The product demonstrated Mn=1800 g/mol and Mw=1900 g/mol, Tm2=72°C, Td,5%=182°C και Td,max =387°C. The application of high vacuum and the frequent use of solvents in similar processes hinder their scaling, but in the framework of this work, the scaling of the above process was achieved, resulting in 6 g of the final product, without significantly downgrading its properties. The second part of this study focused on the investigation of the conditions of melt post-polymerization (temperature and time) and its effectiveness in upgrading the properties of the polymer, while maintaining the green character of the process, selecting the lowest temperatures possible. The process was successful, and resulted in a 87% increase of the Mn and a 179% increase of the Mw, when it took place at 125°C for 16 h.	en
heal.advisorName	Βουγιούκα, Σταματίνα	el
heal.committeeMemberName	Βουγιούκα, Σταματίνα	el
heal.committeeMemberName	Τόπακας, Ευάγγελος	el
heal.committeeMemberName	Αντώνιος, Καραντώνης	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Χημικών Μηχανικών. Τομέας Σύνθεσης και Ανάπτυξης Βιομηχανικών Διαδικασιών (IV). Εργαστήριο Τεχνολογίας Πολυμερών	el
heal.academicPublisherID	ntua
heal.numberOfPages	90 σ.	el
heal.fullTextAvailability	false