The composition of polyester polyols derived from terephthalic acid (T translation - The composition of polyester polyols derived from terephthalic acid (T Vietnamese how to say

The composition of polyester polyol

The composition of polyester polyols derived from terephthalic acid (TPA)
and diethylene glycol (DEG) was examined. The synthesis of individual oligomers 1,n
is described. The compounds were characterized with 1
H and 13C NMR, mass spectrometry,
and elemental analyses. The resonance signals arising from aromatic protons
in 1,n  1–3 were identified in 1
H NMR spectra of TPA-DEG condensates. From 1
H
NMR studies and chromatographic separation, it was concluded that the condensation
of TPA and DEG in a 1:2 molar ratio results in a mixture of linear oligomers 1 with the
average n˜ varying from 1.1 to 2.2, and containing about 2% of cyclic oligomer 2. © 2003
Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 1114 –1123, 2003
Keywords: esterification; oligomers; synthesis; polycondensation
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The composition of polyester polyols derived from terephthalic acid (TPA)and diethylene glycol (DEG) was examined. The synthesis of individual oligomers 1,nis described. The compounds were characterized with 1H and 13C NMR, mass spectrometry,and elemental analyses. The resonance signals arising from aromatic protonsin 1,n  1–3 were identified in 1H NMR spectra of TPA-DEG condensates. From 1HNMR studies and chromatographic separation, it was concluded that the condensationof TPA and DEG in a 1:2 molar ratio results in a mixture of linear oligomers 1 with theaverage n˜ varying from 1.1 to 2.2, and containing about 2% of cyclic oligomer 2. © 2003Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 1114 –1123, 2003Keywords: esterification; oligomers; synthesis; polycondensation
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Thành phần của các polyol polyester nguồn gốc từ acid terephthalic (TPA)
và diethylene glycol (DEG) đã được kiểm tra. Sự tổng hợp của oligomer cá nhân 1, n
được mô tả. Các hợp chất này được đặc trưng với 1
H và 13C NMR, khối phổ,
và phân tích nguyên tố. Các tín hiệu cộng hưởng phát sinh từ các proton thơm
trong 1, n? 1-3 đã được xác định trong 1
H NMR quang phổ của các chất cô đặc TPA-DEG. Từ 1
H
nghiên cứu NMR và tách sắc ký, có thể kết luận rằng sự ngưng tụ
của TPA và DEG trong 1: 2 mol kết quả tỷ lệ trong một hỗn hợp của oligomer tuyến tính 1 với
n~ trung bình khác nhau 1,1-2,2, và chứa khoảng 2% các oligomer vòng 2. © 2003
Wiley tạp, Inc. J polym Sci Phần A: polym Chem 41: 1114 -1123, 2003
Từ khóa: este hóa; oligomer; tổng hợp; polycondensation
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