Thermal Stability of Polymers Confined in Graphite Oxide

被引:32
作者
Barroso-Bujans, Fabienne [1 ]
Alegria, Angel [1 ,2 ]
Pomposo, Jose A. [1 ,2 ,3 ]
Colmenero, Juan [1 ,2 ,4 ]
机构
[1] Univ Basque Country, Mat Phys Ctr CSIC, Ctr Fis Mat, San Sebastian 20018, Spain
[2] Univ Pais Vasco UPV EHU, Dept Fis Mat, San Sebastian 20080, Spain
[3] IKERBASQUE Basque Fdn Sci, Bilbao 48011, Spain
[4] Donostia Int Phys Ctr, San Sebastian 20018, Spain
关键词
POLY(ETHYLENE OXIDE); GRAPHENE OXIDE; ORGANIC-SOLVENTS; FLASH PYROLYSIS; SOLID-STATE; REDUCTION; DEGRADATION; ADSORPTION; POLYETHYLENEGLYCOL; SPECTROSCOPY;
D O I
10.1021/ma302407v
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
In this study, polymer graphite oxide (GO) interactions are demonstrated to induce thermal instability in both the polymer and GO phase in conditions of maximum polymer uptake, in which the polymer chains are either intercalated into the GO interlayer or adsorbed on the GO sheets. We investigate the thermal stability of poly(ethylene oxide) (PEO) intercalated in GO (PEO/GO) in detail, using a combination of techniques including X-ray diffraction (XRD), thermogravimetry (TGA) and TGA-mass spectroscopy (TGA-MS) in dynamic (nonisothermal) and static (isothermal) modes. Our results show that intercalated PEO decomposes at 160 degrees C lower than neat PEO, and that GO decomposes at 50 G lower than pristine GO, due to a synergistic instability between GO and intercalated PEO upon heating. Other hydrophilic polymers-such as poly(vinyl methyl ether) (PVME), poly(vinyl alcohol) (PAA), poly(vinylpyrrolidone) (PVP) and poly(acrylic acid) (PAA)-forming polymer-adsorbed GO structures are also observed to decompose at noticeably lower temperatures than either pristine GO or their own corresponding neat polymers. Unlike PEO/GO intercalation compounds, the excess of PEO phase in PEO GO composites decomposes at temperatures close to that of neat PEO, which demonstrates that those polymer chains far from the adsorbing GO surface are not significantly affected by the presence of GO sheets. Furthermore, isothermal TGA data for PEO/GO intercalation compounds with PEO chains from 5 to 2135 monomeric units are well described by an autocatalytic model similar to that we found for pristine GO in a previous study, which suggests that the overall decomposition of PEO/GO is dominated by the reduction and exfoliation of GO. However, when PEO is adsorbed on graphene substrate, which is thermally stable at the studied temperatures, the kinetic mechanisms follow a first-order reaction similar to neat PEO, but the decomposition occurs with a considerably lower activation energy.
引用
收藏
页码:1890 / 1898
页数:9
相关论文
共 27 条
[1]   Flash pyrolysis of polyethyleneglycol .2. Kinetics determined by T-jump/FTIR spectroscopy [J].
Arisawa, H ;
Brill, TB .
COMBUSTION AND FLAME, 1997, 109 (1-2) :105-112
[2]   Flash pyrolysis of polyethyleneglycol .1. Chemometric resolution of FTIR spectra of the volatile products at 370-550 degrees C [J].
Arisawa, H ;
Brill, TB .
COMBUSTION AND FLAME, 1997, 109 (1-2) :87-104
[3]   Sorption and desorption behavior of water and organic solvents from graphite oxide [J].
Barroso-Bujans, F. ;
Cerveny, S. ;
Alegria, A. ;
Colmenero, J. .
CARBON, 2010, 48 (11) :3277-3286
[4]   Permanent adsorption of organic solvents in graphite oxide and its effect on the thermal exfoliation [J].
Barroso-Bujans, F. ;
Cerveny, S. ;
Verdejo, R. ;
del Val, J. J. ;
Alberdi, J. M. ;
Alegria, A. ;
Colmenero, J. .
CARBON, 2010, 48 (04) :1079-1087
[5]   Tunable uptake of poly(ethylene oxide) by graphite-oxide-based materials [J].
Barroso-Bujans, Fabienne ;
Fernandez-Alonso, Felix ;
Pomposo, Jose A. ;
Enciso, Eduardo ;
Fierro, Jose Luis G. ;
Colmenero, Juan .
CARBON, 2012, 50 (14) :5232-5241
[6]   Macromolecular Structure and Vibrational Dynamics of Confined Poly(ethylene oxide): From Subnanometer 2D-Intercalation into Graphite Oxide to Surface Adsorption onto Graphene Sheets [J].
Barroso-Bujans, Fabienne ;
Fernandez-Alonso, Felix ;
Pomposo, Jose A. ;
Cerveny, Silvina ;
Alegria, Angel ;
Colmenero, Juan .
ACS MACRO LETTERS, 2012, 1 (05) :550-554
[7]   Two-Dimensional Subnanometer Confinement of Ethylene Glycol and Poly(ethylene oxide) by Neutron Spectroscopy: Molecular Size Effects [J].
Barroso-Bujans, Fabienne ;
Fernandez-Alonso, Felix ;
Cerveny, Silvina ;
Arrese-Igor, Silvia ;
Alegria, Angel ;
Colmenero, Juan .
MACROMOLECULES, 2012, 45 (07) :3137-3144
[8]   Revisiting the effects of organic solvents on the thermal reduction of graphite oxide [J].
Barroso-Bujans, Fabienne ;
Fierro, Jose Luis G. ;
Alegria, Angel ;
Colmenero, Juan .
THERMOCHIMICA ACTA, 2011, 526 (1-2) :65-71
[9]   Polymers under extreme two-dimensional confinement: Poly(ethylene oxide) in graphite oxide [J].
Barroso-Bujans, Fabienne ;
Fernandez-Alonso, Felix ;
Cerveny, Silvina ;
Parker, Stewart F. ;
Alegria, Angel ;
Colmenero, Juan .
SOFT MATTER, 2011, 7 (16) :7173-7176
[10]   Kinetic Study of the Graphite Oxide Reduction: Combined Structural and Gravimetric Experiments under Isothermal and Nonisothermal Conditions [J].
Barroso-Bujans, Fabienne ;
Alegria, Angel ;
Colmenero, Juan .
JOURNAL OF PHYSICAL CHEMISTRY C, 2010, 114 (49) :21645-21651