Αυτοοργάνωση αμφίφιλων συμπολυμερών σε εκλεκτικούς διαλύτες

Thermogravimetric Analysis ◽

Radical Polymerization ◽

1H Nmr ◽

Size Exclusion ◽

Scanning Calorimetry ◽

Nuclear Magnetic

Στην παρούσα Διδακτορική διατριβή συντέθηκαν επιτυχώς δισυσταδικά συμπολυμερή πολυαιθυλενοξειδίου-b-πολυ(μεθακρυλικού φερροκενυλοκαρβοξυ-2-αιθυλεστέρα) (PEO-b-PMAEFc), δισυσταδικά συμπολυμερή πολυαιθυλενοξειδίου-b-πολυ(μεθακρυλικού βενζυλεστέρα) (PEO-b-PBnMA) και τέλος τρισυσταδικά συμπολυμερή πολυ(μεθακρυλικού βενζυλεστέρα)-b-πολυαιθυλενοξειδίου-b-πολυ(μεθακρυλικού βενζυλεστέρα) (PBnMA-b-PEO-b- PBnMA) μέσω ριζικού πολυμερισμού μεταφοράς ατόμου (Atom Tranfer Radical Polymerization, ATRP).Τα παραπάνω συμπολυμερή χαρακτηρίστηκαν με Χρωματογραφία Αποκλεισμού Μεγεθών (Size Exclusion Chromatography, SEC) και Φασματοσκοπία Πυρηνικού Μαγνητικού Συντονισμού (Nuclear Magnetic Resonanse, 1H-NMR). Έτσι προσδιορίστηκαν τα μέσα μοριακά βάρη, η κατανομή των μοριακών βαρών και η σύσταση των συμπολυμερών. Μέσω της Θερμοσταθμικής Ανάλυσης (Thermogravimetric Analysis, TGA) και της Διαφορικής θερμιδομετρίας Σάρωσης (Differential Scanning Calorimetry, DSC) μελετήθηκε η θερμική τους αποικοδόμηση και προσδιορίστηκαν οι θερμοκρασίες υαλώδους μετάπτωσης και οι θερμοκρασίες τήξης των δισυσταδικών και τρισυσταδικών συμπολυμερών σε σχέση με τα αντίστοιχα ομοπολυμερή. Τέλος μελετήθηκε η αυτοοργάνωση των παραπάνω συμπολυμερών σε εκλεκτικούς διαλύτες (νερό και ακετονιτρίλιο) ως προς τη μια συστάδα (πολυαιθυλενοξείδιο) μέσω της δυναμικής σκέδασης φωτός και επιβεβαιώθηκε ο σχηματισμός μικκυλίων και μικκυλιακών συσσωματωμάτων. Ακολούθως προσδιορίστηκε η υδροδυναμική ακτίνα και ο συντελεστής άπειρης αραιώσης των παραπάνω μικκυλιακών δομών.

Monitoring the chemical heterogeneity of metallocenecatalysed copolymers of ethylene and higher 1-olefins using CRYSTAF and SEC-FTIR

e-Polymers ◽

10.1515/epoly.2003.3.1.51 ◽

2003 ◽

Vol 3 (1) ◽

Cited By ~ 3

Author(s):

Sven M. Graef ◽

Robert Brüll ◽

Harald Pasch ◽

Udo M. Wahner

Keyword(s):

Catalyst System ◽

Size Exclusion ◽

Side Chain ◽

Chemical Heterogeneity ◽

Scanning Calorimetry ◽

Crystallisation Temperature ◽

Abstract Copolymers of ethylene with 1-decene, 1-tetradecene and 1-octadecene were prepared using the catalyst system racEt[Ind]2ZrCl2/MAO and were analysed with regard to chemical heterogeneity using crystallisation analysis fractionation (CRYSTAF), differential scanning calorimetry (DSC) and size exclusion chromatography coupled to FTIR (SEC-FTIR). The melting and crystallisation temperatures from DSC decrease linearly with increasing amount of comonomer, independently of the nature thereof. The decrease in crystallisation temperature from CRYSTAF of copolymers with higher 1-olefin content indicates a small dependence on the length of the side chain. The chemical heterogeneity of the copolymers as analysed by DSC and CRYSTAF broadens with increasing comonomer concentration.

Size-exclusion chromatography and differential scanning calorimetry of low molecular weight resins used as varnishes for paintings

Progress in Organic Coatings ◽

10.1016/j.porgcoat.2004.06.006 ◽

2005 ◽

Vol 52 (1) ◽

pp. 39-45 ◽

Cited By ~ 12

Author(s):

Christopher A. Maines ◽

E. René de la Rie

Keyword(s):

Molecular Weight ◽

Size Exclusion ◽

Low Molecular Weight ◽

Scanning Calorimetry ◽

Characterization of Polyamide 66 Obturator Materials by Differential Scanning Calorimetry and Size-Exclusion Chromatography

10.21236/ada444191 ◽

2005 ◽

Author(s):

Frederick L. Beyer ◽

Eugene Napadensky ◽

Christopher R. Ziegler

Keyword(s):

Size Exclusion ◽

Polyamide 66 ◽

Scanning Calorimetry ◽

Monte Carlo simulation of size exclusion chromatography for branched polymers formed through free-radical polymerization with chain transfer to polymer

Macromolecular Theory and Simulations ◽

10.1002/1521-3919(20001101)9:8<453::aid-mats453>3.0.co;2-a ◽

2000 ◽

Vol 9 (8) ◽

pp. 453-462 ◽

Cited By ~ 19

Author(s):

Hidetaka Tobita ◽

Noritaka Hamashima

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Free Radical ◽

Radical Polymerization ◽

Chain Transfer ◽

Free Radical Polymerization ◽

Branched Polymers ◽

Size Exclusion ◽

The complementary use of 1H NMR, 13C NMR, FTIR and size exclusion chromatography to investigate the principal structural changes associated with composting of organic materials with diverse origin

Organic Geochemistry ◽

10.1016/j.orggeochem.2007.08.007 ◽

2007 ◽

Vol 38 (12) ◽

pp. 2012-2023 ◽

Cited By ~ 46

Author(s):

Marta Fuentes ◽

Roberto Baigorri ◽

Gustavo González-Gaitano ◽

José Ma García-Mina

Keyword(s):

1H Nmr ◽

13C Nmr ◽

Structural Changes ◽

Organic Materials ◽

Size Exclusion ◽

Diverse Origin

Synthesis of sequence-defined acrylate oligomers via photo-induced copper-mediated radical monomer insertions

Chemical Science ◽

10.1039/c5sc02035b ◽

2015 ◽

Vol 6 (10) ◽

pp. 5753-5761 ◽

Cited By ~ 65

Author(s):

Joke Vandenbergh ◽

Gunter Reekmans ◽

Peter Adriaensens ◽

Thomas Junkers

Keyword(s):

Radical Polymerization ◽

Single Unit ◽

Size Exclusion ◽

Insertion Reactions ◽

Photo-induced copper-mediated radical polymerization is used to synthesize monodisperse sequence defined acrylate oligomers via consecutive single unit monomer insertion reactions and intermediate purification of the compounds by column or preparative recycling size exclusion chromatography.

Exploiting the pulsed laser polymerization-size exclusion chromatography technique to retrieve kinetic parameters in radical polymerization: State-of-the-art and future challenges

Advances in Polymer Reaction Engineering - Advances in Chemical Engineering ◽

10.1016/bs.ache.2020.08.001 ◽

2020 ◽

pp. 59-95

Author(s):

Yoshi W. Marien ◽

Mariya Edeleva ◽

Paul H.M. Van Steenberge ◽

Dagmar R. D'hooge

Keyword(s):

Kinetic Parameters ◽

Radical Polymerization ◽

State Of The Art ◽

Pulsed Laser ◽

Size Exclusion ◽

Future Challenges ◽

Pulsed Laser Polymerization

Solvent suppression techniques for coupling of size exclusion chromatography and 1H NMR using benchtop spectrometers at 43 and 62 MHz

Journal of Magnetic Resonance ◽

10.1016/j.jmr.2020.106889 ◽

2021 ◽

Vol 323 ◽

pp. 106889

Author(s):

J. Höpfner ◽

B. Mayerhöfer ◽

C. Botha ◽

D. Bouillaud ◽

J. Farjon ◽

...

Keyword(s):

1H Nmr ◽

Size Exclusion ◽

Solvent Suppression

Synthesis of Polysilsesquioxanes with Double-Decker Silsesquioxane Repeating Units

Journal of Scientific Research ◽

10.3329/jsr.v8i2.26791 ◽

2016 ◽

Vol 8 (2) ◽

pp. 217-227 ◽

Cited By ~ 8

Author(s):

M. A. Hoque ◽

Y. Kawakami

Keyword(s):

Thermal Properties ◽

1H Nmr ◽

Nitrogen Atmosphere ◽

Size Exclusion ◽

29Si Nmr ◽

Air Atmosphere ◽

Double Decker ◽

Average Residual ◽

Polysilsesquioxanes were synthesized with end functional double-decker silsesquioxanes (DDSQ) and the polymers were characterized with 1H NMR, 29Si NMR and size exclusion chromatography (SEC). Polysilsesquioxane containing iso-butyl end capped DDSQ showed better solubility compared to that of methyl end capped DDSQ. Thermal properties investigated with TGA showed that the polymers exhibited exceptionally high stabilities in the range of 470-530°C even in both nitrogen and air atmosphere. The average residual weights of the polymers at 760°C were around 80% in the nitrogen atmosphere.