1H-NMR sequence analysis of poly(ethylene terephthalates) containing various additional diols

1981 ◽  
Vol 4 (9) ◽  
Author(s):  
HansR. Kricheldorf ◽  
Michael Dr�scher ◽  
WilliamE. Hull
Keyword(s):  
Sequence Analysis ◽  
1H Nmr ◽  
Poly Ethylene

Triad Sequence Analysis of Poly(ethylene/butylene terephthalate) Copolymer Using1H NMR

2002 ◽  
Vol 35 (12) ◽  
pp. 4664-4668 ◽  
Author(s):  
Hironori Matsuda ◽  
Tetsuo Asakura ◽  
Tetsuro Miki
Keyword(s):  
Sequence Analysis ◽  
Butylene Terephthalate ◽  
Poly Ethylene

scholarly journals Synthesis of Mono- and Dithiols of Tetraethylene Glycol and Poly(ethylene glycol)s via Enzyme Catalysis

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 228 ◽  
Author(s):  
Prajakatta Mulay ◽  
Gayatri Shrikhande ◽  
Judit Puskas
Keyword(s):  
Nmr Spectroscopy ◽  
Ethylene Glycol ◽  
1H Nmr ◽  
Enzyme Catalysis ◽  
1H Nmr Spectroscopy ◽  
13C Nmr Spectroscopy ◽  
Tetraethylene Glycol ◽  
Candida Antarctica Lipase ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

This paper investigates the transesterification of methyl 3-mercaptopropionate (MP-SH) with tetraethylene glycol (TEG) and poly(ethylene glycol)s (PEG)s catalyzed by Candida antarctica Lipase B (CALB) without the use of solvent (in bulk). The progress of the reactions was monitored by 1H-NMR spectroscopy. We found that the reactions proceeded in a step-wise manner, first producing monothiols. TEG-monothiol was obtained in 15 min, while conversion to dithiol took 8 h. Monothiols from PEGs with Mn = 1000 and 2050 g/mol were obtained in 8 and 16 h, respectively. MALDI-ToF mass spectrometry verified the absence of dithiols. The synthesis of dithiols required additional fresh CALB and MP-SH. The structure of the products was confirmed by 1H-NMR and 13C-NMR spectroscopy. Enzyme catalysis was found to be a powerful tool to effectively synthesize thiol-functionalized TEGs and PEGs.

Sequence Analysis of Poly(ethylene terephthalate-co-isophthalate) Copolymers by13C NMR

2000 ◽  
Vol 33 (12) ◽  
pp. 4596-4598 ◽  
Author(s):  
Antxon Martínez de Ilarduya ◽  
Darwin P. R. Kint ◽  
Sebastián Muñoz-Guerra
Keyword(s):  
Sequence Analysis ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

NGHIÊN CỨU TỔNG HỢP POLY(ETHYLENE TEREPHTHALATE-CO-ETHYLENE SEBACATE) COPOLYESTE

2021 ◽  
pp. 98-103
Author(s):  
Bình
Keyword(s):  
1H Nmr ◽  
Ethylene Terephthalate ◽  
Tetrabutyl Titanate ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Poly(ethylene terephthalate-co-ethylene sebacate) copolyeste đã được tổng hợp theo quá trình gồm hai giai đoạn tương tự như quá trình tổng hợp polyeste. Tiến trình tổng hợp, đặc biệt là quá trình trùng ngưng được khảo sát bằng phổ hồng ngoại đã chỉ rõ được sự hình thành copolyeste bởi phản ứng giữa nhóm carboxyl và nhóm hydroxyl của glycol. Cấu trúc của copolyeste cũng đã được chứng minh bằng phổ cộng hưởng từ 1H NMR cho thấy, tỷ lệ terephthalate/sebacate trong cấu trúc mạch chính tương đương với tỷ lệ tiền chất sử dụng. Hai hệ xúc tác khác nhau cho quá trình tổng hợp gồm tetrabutyl titanate (TBT) và Sb2­O3/Zn(Ac)2 được so sánh cho thấy, hiệu quả xúc tác của TBT là tốt hơn so với Sb2­O3/Zn(Ac)2.

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