Ring-Opening Polymerization of Lactide Using Aluminum Salen-Type Initiators

2014 ◽  
Vol 915-916 ◽  
pp. 713-716
Author(s):  
Qing Zhang ◽  
Jing Tian ◽  
Zhi Qi Cao ◽  
Ru Xia Xu ◽  
Zhen Zhen Sun ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Reaction Time ◽  
Magnetic Resonance ◽  
Schiff Bases ◽  
Reaction Temperature ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Resonance Spectroscopy ◽  
Aluminum Complex

In this investigation, Schiff bases aluminum complex was synthesized and used as the initiator in the polymerization of D,L-lactide. The aluminum complex was characterized by infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). The influences of different factors, including reaction time, reaction temperature, and the ratio of D, L-lactide/Al3+ on the synthesis of polylactide were described. The results showed that Schiff bases aluminum complex could be successfully applied in the ring opening polymerization. The optimum condition of the ring opening polymerization of D,L-lactide, which included D,L-lactide/Al3+ (mol/mol) ratio of 250, reaction temperature of 120 °C, and reaction time of 16 hours.

Study of Salen(Al) Complex Catalytic System in Ring-Opening Polymerization of Lactide

2015 ◽  
Vol 1095 ◽  
pp. 407-410
Author(s):  
Yun Nie ◽  
Jing Tian ◽  
Qing Zhang ◽  
Meng Fei Du ◽  
Xiao Lun Hao ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Reaction Time ◽  
Magnetic Resonance ◽  
Optimum Condition ◽  
Catalytic System ◽  
Reaction Temperature ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Resonance Spectroscopy

In this paper, salen (Al) complex catalytic system was synthesized and used in the polymerization of lactide. The salen (Al) complex catalytic system was characterized by infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). The influences of different factors, including reaction time, reaction temperature, and the ratio of lactide/Al3+ on the synthesis of polylactide were also described in the investigation. The results showed that the complex catalytic system could be successfully applied in the ring opening polymerization. The optimum condition of the ring opening polymerization of lactide, which included lactide/Al3+ (mol/mol) ratio of 300, reaction temperature of 140 °C, and reaction time of 12 hours.

Copolymerization of Propylene Oxide and Carbon Oxide Catalyzed by Nano SalenCoCl Complex

2014 ◽  
Vol 703 ◽  
pp. 17-20
Author(s):  
Jing Tian ◽  
Sai Dan Zhang ◽  
Qing Zhang ◽  
Ming Zhe Liu ◽  
Yan Guo Wang
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Reaction Time ◽  
Magnetic Resonance ◽  
Reaction Temperature ◽  
Propylene Oxide ◽  
Carbon Oxide ◽  
Resonance Spectroscopy ◽  
Optimum Conditions ◽  
Temperature And Pressure

In this investigation, nanoSchiff bases Cobaltic complex was synthesized and used as the initiator in the copolymerization of carbon oxide and propylene oxide (PO). The nanoCobaltic complex was characterized by infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). The influences of different factors, including reaction time, reaction temperature, and pressure of CO2 on the synthesis of polycarbonate were described. The results show that nanoCobaltic complex could be successfully applied in the copolymerization of CO2 and PO. The optimum conditions of the polymerization, which include CO2 pressure of 30 bar, reaction temperature of 80 °C, and reaction time of 3 hours.

Σύνθεση γραμμικών και αστεροειδών πολυμερών αποτελούμενα από συστάδες με υψηλή παράμετρο αλληλεπίδρασης Flory-Huggins χ

2020 ◽  
Author(s):  
Μαρία-Μαλβίνα Σταθουράκη
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Size Exclusion ◽  
Resonance Spectroscopy ◽  
X Ray ◽  
X Ray Scattering ◽  
Exclusion Chromatography

Σκοπό της διατριβής αυτής αποτελεί η σύνθεση και η μελέτη της αυτοοργάνωσης γραμμικών και αστεροειδών συμπολυμερών με υψηλή παράμετρο αλληλεπιδρασης Flory-Huggins, χ. Τα πολυμερή αυτά, λόγω της μικρής αναμιξιμότητας που παρουσιάζουν τα συστατικά τους, έχουν την δυνατότητα σε μικρά μοριακά βάρη να μπορούν να σχηματίζουν πολύ μικρές και καλά καθορισμένες δομές κατά το μικροφασικό διαχωρισμό. Αρχικά, πραγματοποιήθηκε η σύνθεση των γραμμικών δισυσταδικών συμπολυμερών πολυ(2-βινυλοπυριδίνης)-b-πολυ(l-λακτιδίου) (P2VP-b-PLLA) και των τρισυσταδικών πολυ(l-λακτιδίου)-b-πολύ(διμεθυλοσιλοξάνη)-b-πολύ(l-λακτιδίου) (PLLA-b-PDMS-b-PLLA), καθώς και γραμμικών και αστεροειδών συμπολυμερών πολύ(στυρένιο)-b-πολυ(μονομεθακρυλική γλυκερόλη), PS-b-PGMA, (πολυστυρένιο)2(πολυ(μονομεθακρυλική γλυκερόλη)), (PS)2(PGMA), και (πολυστυρένιο)3(πολυ(μονομεθακρυλική γλυκερόλη)), (PS)3(PGMA), σε διάφορες αναλογίες μοριακών βαρών των συστατικών τους. Χρησιμοποιήθηκαν τεχνικές ζωντανού ανιοντικού πολυμερισμού για τη σύνθεση της P2VP, καθώς και για τη σύνθεση των αστεροειδών πολυμερών, ενώ η σύνθεση των PLLA πραγματοποιήθηκε με χρήση πολυμερισμού διάνοιξης δακτυλίου (Ring Opening Polymerization, ROP). Ο μοριακός χαρακτηρισμός των πολυμερών έγινε μέσω Χρωματογραφίας Αποκλεισμού Μεγεθών (Size Exclusion Chromatography, SEC) και Φασματοσκοπίας Πυρηνικού Μαγνητικού Συντονισμού Πρωτονίου (Nuclear Magnetic Resonance Spectroscopy, 1H-NMR). Τέλος, τίθενται τα αποτελέσματα που αφορούν τα γεωμετρικά χαρακτηριστικά (μέγεθος, μορφολογία) των περιοδικών νανοδομών που σχηματίζουν στο τήγμα τα συμπολυμερή, μέσω σκέδασης ακτίνων Χ σε μικρές γωνίες (Small-angle X-ray Scattering, SAXS).

Influence of Co(ii) Ionic Liquids Catalytic System for Polycarbonate (CHO/CO2) Synthesis

2015 ◽  
Vol 1095 ◽  
pp. 345-348
Author(s):  
Jing Tian ◽  
Qing Zhang ◽  
Wei Feng Li ◽  
Yue Meng ◽  
Tong Yan ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Ionic Liquids ◽  
Infrared Spectroscopy ◽  
Reaction Time ◽  
Catalytic System ◽  
Reaction Temperature ◽  
Carbon Oxide ◽  
Resonance Spectroscopy ◽  
Cyclohexene Oxide ◽  
Temperature And Pressure

In the report, Co (ii) ionic liquids catalytic system was synthesized and used in the polycarbonate (CHO/CO2) synthesis. The Co (ii) ionic liquids catalytic system was characterized by infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). The influences of different factors, including reaction time, reaction temperature, and pressure of CO2 on the synthesis of polycarbonate (CHO/CO2) were described. The results show that Co (ii) ionic liquids catalytic system could be successfully applied in the copolymerization of carbon oxide (CO2) and cyclohexene oxide (CHO). The optimum synthetic conditions of the polycarbonate, including reaction temperature of 90 °C, reaction time of 8 hours , and CO2 pressure of 25 bar.

Sign in / Sign up

Export Citation Format

Share Document