Study on the monomer sequence of copolymers prepared by partial hydrolysis of poly(tert-butyl methacrylate) in various solvents
碩士 === 南台科技大學 === 化學工程與材枓工程系 === 102 === Copolymers of methacrylic acid (MAA) and tert-butyl methacrylate (TBMA) were prepared by acidic hydrolysis of poly tert-butyl methacrylate. The poly(MAA- TBMA)s were converted to copolymers of methyl methacrylate (MMA) and TBMA by methylation with...
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| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
103
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| Online Access: | http://ndltd.ncl.edu.tw/handle/82230862104079006137 |
| Summary: | 碩士 === 南台科技大學 === 化學工程與材枓工程系 === 102 === Copolymers of methacrylic acid (MAA) and tert-butyl methacrylate (TBMA)
were prepared by acidic hydrolysis of poly tert-butyl methacrylate. The poly(MAA-
TBMA)s were converted to copolymers of methyl methacrylate (MMA) and TBMA
by methylation with diazomethane.
The result reveals the side chain of PTBMA
changed to carboxylic acid group by hydrolysis reaction. The characteristic signals of
the proton of methyl groups at 3.6 ppm in the
1
H NMR spectrum after the
esterification with diazomethane, which demonstrated the hydrolysis and
esterification of PTBMA can successfully give MMA-TBMA copolymer. The results
of STA showed the weight loss decreased with increased of MMA content in
MMA-TBMA copolymer.
The thermal properties of the copolymer obtained in
different solvents are significant changes. The ratio of PMMA to PTBMA within the
copolymer was determined to be 48.9/51.5 by
1
H NMR spectroscopy. The first and
second principal components (PC1 and PC2) reflected chemical composition and
heterogeneity of monomer sequence, respectively. The plots indicate that the
monomer sequence in the copolymers derived from acidic hydrolysis resembles to the
sequence in radical copolymers (random).
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