The computers & program: the calculations were run on Cray SV1ex-1-32 supercomputer using Gaussian 98 package. Satisfactory correlations between calculated shielding constants and experimental chemical shifts were found. The analyses of shielding tensors are in progress. Reference: 1. Kong, Jin-Ming; Chia, Lian-Sai; Goh, Ngoh-Khang; Chia, Tet-Fatt; Brouillard, R. (2003). Analysis and biological activities of anthocyanins. Phytochemistry, 64, 923-933. 98
INVESTIGATION OF TRANSESTERIFICATION IN POLY(ETHYLENE 2,6-NAPHTHALATE)/POLYCARBONATE COMPOSITE USING OFF-RESONANCE NMR AND DMTA TECHNIQUES A. Woźniak-Braszak a) , J. Jurga b) , K. Jurga a) , S. Jurga c) , M. Szostek b) a) High Pressure Physics Division, Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland, e-mail:abraszak@hoth.amu.edu.pl; b) Polymer Processing Division, Institute of Materials Technology, Poznan University of Technology, Piotrowo 3, 61-138 Poznań, Poland, e-mail:jan.jurga@put.poznan.pl; c) Macromolecular Physics Division, Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland The work presents the study of molecular dynamics of the series of poly(ethhylene 2,6-naphthalate)(PEN)/polycarbonate (PC) blends with a changing weight ratio of homopolymers by off-resonance NMR and dynamic-mechanical thermal analysis DMTA. These investigations concern new polymer materials based on polyesters and polycarbonates which have recently received wide commercial and industrial application. Two series of blends were prepared by injection moulded using the Engel machine ES, one without the compatibilizer and the second with the compatibilizer SMAC (Samarium acetylacetonate hydrate). The reaction taking place between the polyester and polycarbonate is known as transesterification. It provides novel materials with varying degree of randomness, composition and physical properties. The product obtained is a copolymer consisting of two polymers. The properties of this product are a mixture of the properties of the these two homopolymers. Transesterification affects the melting behaviour. It also has a strong impact on properties determined by kinetic process as the glass transition of the blend and the crystalization rate of PEN. The change of glass transition temperature and that of melting temperature of blends with changing weight of homopolymers were investigated. The influence of the compatibilizer on the course of transesterification was investigated as well. The molecular dynamics of the blends was studied by off-resonance NMR. The correlation times of the internal motions and the spectral density function amplitudes were estimated on the basis of the dispersion of the spin-lattice relaxation time off-resonance T 1ρ off . The dynamic-mechanical properties of the blends were investigated by dynamicmechanical thermal analysis DMTA. By this method, some important characteristics such as the glass transition temperatures and frequency-temperature characteristics, expressed in terms of master curves, were obtained. The comparative analysis of the DMTA and NMR results led to the explanation of the transesterification on the compatibility of PEN and PC. Acnowledgement This work was supported by KBN 7T0BE 004 21. References: 1. J. Jurga, A. Woźniak-Braszak, Z. Fojud, K. Jurga, Proton Magnetic Relaxation in Polymer Materials, Solid State Nuclear Magnetic Resonance, in print. 99
- Page 1 and 2:
The Henryk Niewodniczański INSTITU
- Page 3 and 4:
Contents R. Banyś, A. Słowik, M.
- Page 5 and 6:
J. Kolmas, M. Uniczko, E. Kalinowsk
- Page 7 and 8:
Ł. Popenda, Z. Gdaniec, G. Dominia
- Page 9 and 10:
USEFULNESS OF PROTON MAGNETIC RESON
- Page 11 and 12:
INFLUENCE OF PARAMAGNETIC IONS ON F
- Page 13 and 14:
NMR RELAXATION OF PAPER SAMPLES Bar
- Page 15 and 16:
SPIN-LATTICE RELAXATION OF D 2 QUAN
- Page 17 and 18:
INVESTIGATION OF NEUROPROTECTING EF
- Page 19 and 20:
OPTICAL PUMPING OF 3 He Katarzyna C
- Page 21 and 22:
NMR STUDY OF GELATION PROCESS OF LO
- Page 23 and 24:
MRI INVESTIGATIONS OF HYDROGEL FORM
- Page 25 and 26:
CHEMICAL SHIFT TITRATION AT THE INT
- Page 27 and 28:
LOCAL DYNAMICS AND ORGANIZATION OF
- Page 29 and 30:
1 H NMR DETECTION OF σ-ADDUCTS IN
- Page 31 and 32:
HYDRATION OF WHEAT PHOTOSYNTHETIC M
- Page 33 and 34:
References: 1. H. Harańczyk On wat
- Page 35 and 36:
(EDV) and end-systolic (ESV) volume
- Page 37 and 38:
THE MOST STABLE POLYMORPHIC FORM OF
- Page 39 and 40:
A DETERMINATION OF ABSOLUTE SHIELDI
- Page 41 and 42:
DIAGNOTIC VALUE OF MRI IN CONVERSIO
- Page 43 and 44:
NMR AND FTIR STUDY OF MOLECULAR DYN
- Page 45 and 46:
EFFECTS OF INTERMOLECULAR INTERACTI
- Page 47 and 48: 600000 Integral of 1D MRI profils [
- Page 49 and 50: simultaneous analyse of the tempera
- Page 51 and 52: 1 H NMR STUDIES OF PLATINUM(II) CHL
- Page 53 and 54: 35 Cl-NQR STUDY OF ELECTRONIC STRUC
- Page 55 and 56: 35 Cl- NQR AND 1 H-NMR STUDY OF MOL
- Page 57 and 58: THE SYNTHESIS AND NMR ANALYSIS OF T
- Page 59 and 60: STUDY OF MOTIONAL PROCESSES OF DRAW
- Page 61 and 62: intensity (arb. units) 0,20 0,15 0,
- Page 63 and 64: data for Cβ-nonplanar model 3 are
- Page 65 and 66: T 1 DISPERSION AND SELF-DIFFUSION N
- Page 67 and 68: A LOW FIELD MRI SYSTEM FOR HYPERPOL
- Page 69 and 70: 1 H MAS NMR OF FLAVONOIDS Katarzyna
- Page 71 and 72: EFFECT OF TEMPERATURE ON LIPOSOME S
- Page 73 and 74: 1 H, 13 C NMR AND GIAO/DFT CALCULAT
- Page 75 and 76: NMR STUDY OF THE HUMIC ACIDS EXTRAC
- Page 77 and 78: NMR STUDY OF LAYERED ANGANITE La 1.
- Page 79 and 80: MAGNETIC SUSCEPTIBILITY EVALUATION
- Page 81 and 82: A NOVEL SOURCE OF MAGNETIC FIELD FO
- Page 83 and 84: DETERMINATION OF AMINO ACIDS IN BOD
- Page 85 and 86: MOLECULAR DYNAMICS OF TERT-BUTYL CH
- Page 87 and 88: MR MICROSCOPY IN COMPARISON OF YOUN
- Page 89 and 90: NH CH CH 2 NH CH CO COONa n CH 2 m
- Page 91 and 92: 35 Cl-NQR STUDY OF MOLECULAR DYNAMI
- Page 93 and 94: 35 Cl-NQR STUDY OF THE SUBSTITUENT
- Page 95 and 96: 13 C AND 1 H NUCLEAR MAGNETIC SHIEL
- Page 97: 13 C CPMAS NMR OF ANTHOCYANINS AND
- Page 101 and 102: T 2 RELAXATION MAP OF ARTICULAR CAR
- Page 103 and 104: MICROTOMOGRAPHY STUDIES OF TABLETS
- Page 105 and 106: MAPPING OF THE BI-EXPONENTIAL DIFFU
- Page 107 and 108: DEUTERIUM NMR IN RMn 2 D 2 (R = Y,
- Page 109 and 110: The neutron scattering (IINS, QNS,
- Page 111 and 112: STRUCTURE OF 4-QUINOLINONES ANALYSE
- Page 113: NMR MULTIPOLE RELAXATION IN THE ROT
Change language