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Statements

Subject Item
n2:RIV%2F49777513%3A23640%2F13%3A43919906%21RIV14-MSM-23640___
rdf:type
skos:Concept n6:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.polymdegradstab.2013.08.010
dcterms:description
A series of poly(amide imide)s (PAIs) having alternate (amide-amide) and (imide-imide) units (polymers 1-14 and 22-35), and random distribution of amide-imide linkages (polymers 15-21 and 36-42) were prepared by low temperature solution polymerization of benzene-1,2,4,5-tetracarboxylic dianhydride (PMDA)/benzophenone-3,3',4,4'-tetracarboxylic dianhydride (BTDA), diamines (cyclic and aromatic) and acid chloride in dimethylforamide. All the polymers were readily soluble in polar aprotic solvents with inherent viscosities in the range of 0.134-0.878. The process of cycloimidization of poly(amide amic acid)s (PAAs) to PAIs was investigated by TGA and FT-IR techniques at four different temperatures i.e., 175, 200, 225, and 260°C. The rate of cycloimidization was calculated by taking into account the theoretical weight loss (WT), obtained from [n x Mw(H2O)/Mw(RU)] W, where Mw (H2O) molecular weight of water, W weight of PAA taken for TGA, Mw (RU) the molecular weight of repeat unit of PAA, n number of water molecules eliminated per repeat unit of PAA upon cycloimidization. For a particular diamine, the extent of percentage cycloimidization at the end of the isothermal heating was higher for PAAs containing trimellitic anhydride chloride (TMAc) unit, irrespective of the nature of the dianhydride and diamine. Thermal and thermooxidative degradation of PAIs was investigated by TGA in nitrogen and oxygen atmosphere. The initial decomposition temperatures (IDT) of polymers are above 260°C, and vary widely (from 260 to 501°C) depending upon the structure of the polymer backbone. PAIs containing TMAc exhibited higher thermal stability as compared to those polymers having diacid chloride units, in both N2/O2 atmospheres. A series of poly(amide imide)s (PAIs) having alternate (amide-amide) and (imide-imide) units (polymers 1-14 and 22-35), and random distribution of amide-imide linkages (polymers 15-21 and 36-42) were prepared by low temperature solution polymerization of benzene-1,2,4,5-tetracarboxylic dianhydride (PMDA)/benzophenone-3,3',4,4'-tetracarboxylic dianhydride (BTDA), diamines (cyclic and aromatic) and acid chloride in dimethylforamide. All the polymers were readily soluble in polar aprotic solvents with inherent viscosities in the range of 0.134-0.878. The process of cycloimidization of poly(amide amic acid)s (PAAs) to PAIs was investigated by TGA and FT-IR techniques at four different temperatures i.e., 175, 200, 225, and 260°C. The rate of cycloimidization was calculated by taking into account the theoretical weight loss (WT), obtained from [n x Mw(H2O)/Mw(RU)] W, where Mw (H2O) molecular weight of water, W weight of PAA taken for TGA, Mw (RU) the molecular weight of repeat unit of PAA, n number of water molecules eliminated per repeat unit of PAA upon cycloimidization. For a particular diamine, the extent of percentage cycloimidization at the end of the isothermal heating was higher for PAAs containing trimellitic anhydride chloride (TMAc) unit, irrespective of the nature of the dianhydride and diamine. Thermal and thermooxidative degradation of PAIs was investigated by TGA in nitrogen and oxygen atmosphere. The initial decomposition temperatures (IDT) of polymers are above 260°C, and vary widely (from 260 to 501°C) depending upon the structure of the polymer backbone. PAIs containing TMAc exhibited higher thermal stability as compared to those polymers having diacid chloride units, in both N2/O2 atmospheres.
dcterms:title
Preparation, characterization and thermal degradation study of poly(amide imide)s based on tri-component mixture of PMDA/BTDA, diamines and acid chloride Preparation, characterization and thermal degradation study of poly(amide imide)s based on tri-component mixture of PMDA/BTDA, diamines and acid chloride
skos:prefLabel
Preparation, characterization and thermal degradation study of poly(amide imide)s based on tri-component mixture of PMDA/BTDA, diamines and acid chloride Preparation, characterization and thermal degradation study of poly(amide imide)s based on tri-component mixture of PMDA/BTDA, diamines and acid chloride
skos:notation
RIV/49777513:23640/13:43919906!RIV14-MSM-23640___
n6:predkladatel
n7:orjk%3A23640
n4:aktivita
n5:P
n4:aktivity
P(ED2.1.00/03.0088)
n4:cisloPeriodika
11
n4:dodaniDat
n15:2014
n4:domaciTvurceVysledku
n9:6209904 n9:5331595 n9:8474419 n9:2667959
n4:druhVysledku
n20:J
n4:duvernostUdaju
n17:S
n4:entitaPredkladatele
n13:predkladatel
n4:idSjednocenehoVysledku
98970
n4:idVysledku
RIV/49777513:23640/13:43919906
n4:jazykVysledku
n8:eng
n4:klicovaSlova
FT-IR; Thermal stability; Cycloimidization; Poly(amide imide)s
n4:klicoveSlovo
n12:Thermal%20stability n12:Cycloimidization n12:Poly%28amide%20imide%29s n12:FT-IR
n4:kodStatuVydavatele
NL - Nizozemsko
n4:kontrolniKodProRIV
[ABAF0958A9E3]
n4:nazevZdroje
Polymer Degradation and Stability
n4:obor
n11:CD
n4:pocetDomacichTvurcuVysledku
4
n4:pocetTvurcuVysledku
4
n4:projekt
n16:ED2.1.00%2F03.0088
n4:rokUplatneniVysledku
n15:2013
n4:svazekPeriodika
98
n4:tvurceVysledku
Kadlec, Jaroslav Dodda, Jagan Mohan Kullová, Lucie Kovářík, Tomáš
s:issn
0141-3910
s:numberOfPages
11
n18:doi
10.1016/j.polymdegradstab.2013.08.010
n21:organizacniJednotka
23640