서지주요정보
$^13C$ NMR Relaxation을 이용한 Stereoregular PMMA 용액의 분자 거동 = Molecular motion of steroregular poly(methyl methacrylate) in n-alkyl acetate solvents studied by $^13C$ NMR spin-lattice relaxation measurements
서명 / 저자 $^13C$ NMR Relaxation을 이용한 Stereoregular PMMA 용액의 분자 거동 = Molecular motion of steroregular poly(methyl methacrylate) in n-alkyl acetate solvents studied by $^13C$ NMR spin-lattice relaxation measurements / 류병규.
저자명 류병규 ; Ryoo, Byung-Kyu
발행사항 [대전 : 한국과학기술원, 1993].
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소장정보

등록번호

8003885

소장위치/청구기호

학술문화관(문화관) 보존서고

MCHE 93033

SMS전송

도서상태

이용가능

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초록정보

The segmental motions of stereoregular poly(methyl methacrylates), PMMAs, in a homologous series of n-alkyl acetate solvents as well as the molecular motion of solvents themselves were investigated by the $^{13}$C spin-lattice relaxation time($T_1$) measurements at 40℃. Not only the segmental motion of polymer but also the molecular motion of solvents are mobile in isotactic PMMA solutions than in syndiotactic PMMA solutions. As the molecular size of solvents increases, the mobilities of all the carbon groups in isotactic polymer solutions decrease. However, in syndiotactic PMMA solutions, the mobilities of quaternary, carbonyl, and methoxy carbons increase with the increase of molecular size of solvents while the mobilities of the methylene and α-methyl carbons decrease. These results are considered to be due to the much stronger polymer-solvent interactions in syndiotactic PMMA solutions than in isotactic PMMA solutions. By relating the solvent dependences of the $T_1$ data in syndiotactic polymer solutions to that of the known dissolution rate data of atactic PMMA, it was found that the solvent dependences of the $T_1$ values of those carbon groups in which the polymer-solvent interaction is not significant, e.g., methylene and α-methyl carbon groups, were consistent with the solvnet dependence of the dissolution rate of polymer. This result suggested that the dissolution dynamics of polymer is significantly affected by the free volume and segmental motion of polymer. Thus the $^{13}$C NMR spin-lattice relaxation experiments will be expected to be useful for a preliminary estimation of the dissolution rate of polymer.

서지기타정보

서지기타정보
청구기호 {MCHE 93033
형태사항 viii, 77 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Byung-Kyu Ryoo
지도교수의 한글표기 : 박정기
지도교수의 영문표기 : Jung-Ki Park
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 74-77
주제 Molecular dynamics.
Nuclear magnetic resonance spectroscopy.
분자 운동. --과학기술용어시소러스
핵자기 공명. --과학기술용어시소러스
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