F. Ambriz-Vargas, R. Zamorano-ulloa, A. Romero-Serrano, J. Ortiz-Landeros, J. Crespo-Villegas, D. Ramírez-Rosales, C. Gómez-Yáñez
En el presente trabajo se estudia la quimica de defectos del Bi4Ti3O12 a temperatura ambiente, haciendo enfasis en el efecto de los defectos puntuales sobre las propiedades ferroelectricas. Mediciones de conductividad electrica, permitividad dielectrica, perdida dielectrica, caracterizacion estructural y resonancia de spin electronico fueron utilizadas para demostrar la existencia de diferentes defectos puntuales. Titanato de Bismuto puro y dopado con niobio fueron sintetizados a partir del metodo convencional “Reaccion del estado solido”. El analisis de refinamiento de Rietveld revelo la formacion de vacancias de bismuto al igual que la formacion de atomos de niobio en los sitios atomicos del titanio, mientras que las mediciones de resonancia de spin electronico revelaron senales asociadas a impurezas de hierro. El presente comunicado soporta mecanismos de compensacion dominados por la presencia de electrones libres y vacancias de bismuto
{"title":"Point-Defect Chemistry on the Polarization Behavior of Niobium Doped Bismuth Titanate","authors":"F. Ambriz-Vargas, R. Zamorano-ulloa, A. Romero-Serrano, J. Ortiz-Landeros, J. Crespo-Villegas, D. Ramírez-Rosales, C. Gómez-Yáñez","doi":"10.29356/JMCS.V61I4.462","DOIUrl":"https://doi.org/10.29356/JMCS.V61I4.462","url":null,"abstract":"En el presente trabajo se estudia la quimica de defectos del Bi4Ti3O12 a temperatura ambiente, haciendo enfasis en el efecto de los defectos puntuales sobre las propiedades ferroelectricas. Mediciones de conductividad electrica, permitividad dielectrica, perdida dielectrica, caracterizacion estructural y resonancia de spin electronico fueron utilizadas para demostrar la existencia de diferentes defectos puntuales. Titanato de Bismuto puro y dopado con niobio fueron sintetizados a partir del metodo convencional “Reaccion del estado solido”. El analisis de refinamiento de Rietveld revelo la formacion de vacancias de bismuto al igual que la formacion de atomos de niobio en los sitios atomicos del titanio, mientras que las mediciones de resonancia de spin electronico revelaron senales asociadas a impurezas de hierro. El presente comunicado soporta mecanismos de compensacion dominados por la presencia de electrones libres y vacancias de bismuto","PeriodicalId":21347,"journal":{"name":"Revista de la Sociedad Química de Mexico","volume":"14 1","pages":"317-325"},"PeriodicalIF":0.0,"publicationDate":"2018-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82458182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Luis Bahena, C. Cervantes, K. Soto-Arredondo, M. Martínez-Alfaro, Natanael Zarco, M. García-Revilla, Y. Alcaraz-Contreras, L. P. Tirado, M. Vázquez, J. Robles
R. Kaur, Manmohan Chhibber, Partha Mahata, S. Mittal
The fluorescent properties of a coordination polymer (CP), 1, were used as turn-on and turn-off detector for nitroaromatics and organophosporus pesticides respectively. Compound 1 exhibits exceptionally high efficiency for the detection of 2,4,6-trinitrophenol (TNP) through luminescence quenching with a quenching constant [KSV] value of 2.30 X 105 M-1, highest among the known coordination polymers. Minimum detection limit achieved by the proposed method was 43 ppb. This emission property of 1 was also used successfully to detect triazophos and chlorpyrifos, aromatic organophosphorus pesticides, which enhanced the emission intensity by 238% and a red shift of ~70 nm in case of former. Non aromatic pesticides like malathion and acephate did not show any increase in the emission intensity. Minimum detection limits for triazophos and chlorpyrifos, aromatic organophosphorus pesticides, were 0.6 and 0.7 ppm respectively.
利用配位聚合物(CP) 1的荧光特性分别作为硝基芳烃和有机磷农药的开启和关闭检测器。化合物1对2,4,6-三硝基苯酚(TNP)的发光猝灭效率极高，猝灭常数[KSV]值为2.30 X 105 M-1，是已知配位聚合物中最高的。该方法的最低检测限为43 ppb。利用1的这种发射特性，成功地检测了三唑磷和毒死蜱这两种芳香有机磷农药，前者的发射强度提高了238%，红移约70 nm。马拉硫磷和甲胺磷等非芳香农药的排放强度没有增加。芳香有机磷农药三唑磷和毒死蜱的最低检出限分别为0.6和0.7 ppm。
{"title":"Luminescence Based Detection of Trinitrophenol and Aromatic Organophosphorous Pesticides Using a Coordination Polymer","authors":"R. Kaur, Manmohan Chhibber, Partha Mahata, S. Mittal","doi":"10.29356/JMCS.V61I4.464","DOIUrl":"https://doi.org/10.29356/JMCS.V61I4.464","url":null,"abstract":"The fluorescent properties of a coordination polymer (CP), 1, were used as turn-on and turn-off detector for nitroaromatics and organophosporus pesticides respectively. Compound 1 exhibits exceptionally high efficiency for the detection of 2,4,6-trinitrophenol (TNP) through luminescence quenching with a quenching constant [KSV] value of 2.30 X 105 M-1, highest among the known coordination polymers. Minimum detection limit achieved by the proposed method was 43 ppb. This emission property of 1 was also used successfully to detect triazophos and chlorpyrifos, aromatic organophosphorus pesticides, which enhanced the emission intensity by 238% and a red shift of ~70 nm in case of former. Non aromatic pesticides like malathion and acephate did not show any increase in the emission intensity. Minimum detection limits for triazophos and chlorpyrifos, aromatic organophosphorus pesticides, were 0.6 and 0.7 ppm respectively.","PeriodicalId":21347,"journal":{"name":"Revista de la Sociedad Química de Mexico","volume":"61 23","pages":"336-341"},"PeriodicalIF":0.0,"publicationDate":"2018-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91514572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this article, various dyes have been quantum chemically designed which are based on A-π-D-π-A structural configuration. The main objective of this work is to study the effect of electron deficient thiadiazole derivatives as the π-spacers. The role of these π-spacers in phenoxazine-based dyes have been studied through electronic, non-linear optical (NLO) and absorption properties. The electronic structures, absorption spectra and NLO response were calculated by employing quantum chemical methods. The results reveal that the polarizability ( α ) and hyperpolarizability ( β ) remarkably increase from dye 1 to dye 5 . As compared to model of dye 1 , dyes 2-5 have shown red-shifted absorption spectra and low band gaps.
{"title":"Non-linear Optical Response of Phenoxazine-based Dyes: Molecular Engineering of Thiadiazole Derivatives as π-spacers","authors":"Muhammad Ramzan Saeed Ashraf Janjua","doi":"10.29356/JMCS.V61I3.352","DOIUrl":"https://doi.org/10.29356/JMCS.V61I3.352","url":null,"abstract":"In this article, various dyes have been quantum chemically designed which are based on A-π-D-π-A structural configuration. The main objective of this work is to study the effect of electron deficient thiadiazole derivatives as the π-spacers. The role of these π-spacers in phenoxazine-based dyes have been studied through electronic, non-linear optical (NLO) and absorption properties. The electronic structures, absorption spectra and NLO response were calculated by employing quantum chemical methods. The results reveal that the polarizability ( α ) and hyperpolarizability ( β ) remarkably increase from dye 1 to dye 5 . As compared to model of dye 1 , dyes 2-5 have shown red-shifted absorption spectra and low band gaps.","PeriodicalId":21347,"journal":{"name":"Revista de la Sociedad Química de Mexico","volume":"34 1","pages":"260-265"},"PeriodicalIF":0.0,"publicationDate":"2017-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90470942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Dongamanti, M. Ziauddin, B. Lakshmi, M. Sarasija
A series of ten novel ( E )-(4-(aryl)phenyl)(3-(2-(1-phenyl-3- (thiophen-2-yl)-1 H -pyrazol-4-yl)vinyl)benzofuran-2-yl)methanones ( 7a-j ) derivatives were prepared by traditional Claisen-Schmidt and Suzuki cross-coupling reaction under conventional and microwave irradiation conditions. The structures of all the newly synthesized compounds were established on the basis of FTIR, 1 H NMR, 13 C NMR, mass spectral data and elemental analysis. The products were assayed for their in vitro antibacterial activity against different types of bacterial strains. Further the antifungal activity was examined by inhibitory action against three fungal strains such as Aspergillus niger , Aspergillus flavus and Fusarium oxysporum .
采用传统的Claisen-Schmidt和Suzuki交叉偶联反应，在常规和微波辐照条件下制备了10个新的(E)-(4-(芳基)苯基)(3-(2-(1-苯基-3-(噻吩-2-基)-1 H -吡唑-4-基)乙烯基)苯并呋喃-2-基)甲烷(7a-j)衍生物。根据FTIR、1h NMR、13c NMR、质谱数据和元素分析确定了所有新合成化合物的结构。测定产物对不同类型细菌的体外抑菌活性。进一步通过对黑曲霉、黄曲霉和尖孢镰刀菌的抑菌作用，考察了其抑菌活性。
{"title":"Synthesis of (E)-(4-(Aryl)phenyl)(3-(2-(1-phenyl-3-(thiophen-2-yl)-1Hpyrazol-4-yl)vinyl)benzofuran-2-yl)methanones by Claisen Schmidt-Suzuki Cross Coupling and their Antibacterial and Antifungal Activity","authors":"A. Dongamanti, M. Ziauddin, B. Lakshmi, M. Sarasija","doi":"10.29356/JMCS.V61I3.342","DOIUrl":"https://doi.org/10.29356/JMCS.V61I3.342","url":null,"abstract":"A series of ten novel ( E )-(4-(aryl)phenyl)(3-(2-(1-phenyl-3- (thiophen-2-yl)-1 H -pyrazol-4-yl)vinyl)benzofuran-2-yl)methanones ( 7a-j ) derivatives were prepared by traditional Claisen-Schmidt and Suzuki cross-coupling reaction under conventional and microwave irradiation conditions. The structures of all the newly synthesized compounds were established on the basis of FTIR, 1 H NMR, 13 C NMR, mass spectral data and elemental analysis. The products were assayed for their in vitro antibacterial activity against different types of bacterial strains. Further the antifungal activity was examined by inhibitory action against three fungal strains such as Aspergillus niger , Aspergillus flavus and Fusarium oxysporum .","PeriodicalId":21347,"journal":{"name":"Revista de la Sociedad Química de Mexico","volume":"63 1","pages":"167-176"},"PeriodicalIF":0.0,"publicationDate":"2017-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91105086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elizabeth Reyes-López, B. Quiroz-García, Pablo Carpio‐Martínez, J. Jiménez‐Barbero, F. Cortés‐Guzmán, N. Esturau-Escofet, G. Cuevas
The nuclear Overhauser effect (nOe) is a consequence of the cross-relaxation and it involves the transfer of nuclear spin polarization from one population to another intra or inter-molecularly. It is generally accepted that a proton-proton distance between 4 and 5 A is the upper limit for the occurrence of measurable nOe´s in small molecules. However, we herein show how detectable nOe´s may, in fact, take place between alkyl groups of quinones with substitutions at 1-4 relative positions, showing distances longer than 6 A. Although the signals of interest are very small, of the order of 1% of a normal nOe, so a priori are considered artifacts originated by decoupling modulation, they maintain, properties that make them interesting and give them coherence as interpretable signals. If the signals of interest are not artifacts these observations represent an important breakthrough with impact on the standard protocols that are commonly used for determination of molecular structure and conformation.
{"title":"The Folded Conformation of Perezone Revisited. Long Range nOe Interaction in Small Molecules: Interpretable Small Signals or Useless Large Artifacts?","authors":"Elizabeth Reyes-López, B. Quiroz-García, Pablo Carpio‐Martínez, J. Jiménez‐Barbero, F. Cortés‐Guzmán, N. Esturau-Escofet, G. Cuevas","doi":"10.29356/JMCS.V61I3.343","DOIUrl":"https://doi.org/10.29356/JMCS.V61I3.343","url":null,"abstract":"The nuclear Overhauser effect (nOe) is a consequence of the cross-relaxation and it involves the transfer of nuclear spin polarization from one population to another intra or inter-molecularly. It is generally accepted that a proton-proton distance between 4 and 5 A is the upper limit for the occurrence of measurable nOe´s in small molecules. However, we herein show how detectable nOe´s may, in fact, take place between alkyl groups of quinones with substitutions at 1-4 relative positions, showing distances longer than 6 A. Although the signals of interest are very small, of the order of 1% of a normal nOe, so a priori are considered artifacts originated by decoupling modulation, they maintain, properties that make them interesting and give them coherence as interpretable signals. If the signals of interest are not artifacts these observations represent an important breakthrough with impact on the standard protocols that are commonly used for determination of molecular structure and conformation.","PeriodicalId":21347,"journal":{"name":"Revista de la Sociedad Química de Mexico","volume":"3137 1","pages":"177-185"},"PeriodicalIF":0.0,"publicationDate":"2017-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86561244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Z. Benzekri, R. Benhdidou, S. Hamia, H. Serrar, S. Boukhris, B. Sallek, A. Hassikou, A. Souizi
Dicalcium phosphate dihydrate (DCPD) was used as a green and reusable catalyst in order to synthesized two important categories of heterocycles, 3,4-dihydropyrimidin-2-ones and 3,4-dihydropyrimidin-2-thiones. The advantages of our method are as follow: short reaction times, green process, reduced environmental hazards and high isolated yield of products.
{"title":"A Green and Simple Protocol one-pot Biginelli Condensation using Dicalcium Phosphate as Reusable Catalyst","authors":"Z. Benzekri, R. Benhdidou, S. Hamia, H. Serrar, S. Boukhris, B. Sallek, A. Hassikou, A. Souizi","doi":"10.29356/JMCS.V61I3.347","DOIUrl":"https://doi.org/10.29356/JMCS.V61I3.347","url":null,"abstract":"Dicalcium phosphate dihydrate (DCPD) was used as a green and reusable catalyst in order to synthesized two important categories of heterocycles, 3,4-dihydropyrimidin-2-ones and 3,4-dihydropyrimidin-2-thiones. The advantages of our method are as follow: short reaction times, green process, reduced environmental hazards and high isolated yield of products.","PeriodicalId":21347,"journal":{"name":"Revista de la Sociedad Química de Mexico","volume":"174 1","pages":"217-221"},"PeriodicalIF":0.0,"publicationDate":"2017-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72677020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, an efficient, green and eco-friendly method for synthesis of 3,4-dihydropyrimidin-2(1 H )-ones via one-pot multi-component reaction of aldehydes, urea and ethyl acetoacetate is shown at the presence of cuttlebone as an effective, reusable and natural heterogeneous catalyst. The advantages of this method are short reaction times, high yields, simple work-up, and reusable natural catalysts. The structure of cuttlebone was characterized by FT-IR spectrum, scanning electron microscopy (SEM) and energy dispersive spectrometer (SEM-EDS).
{"title":"A Green Synthesis of 3, 4-Dihydropyrimidin-2(1H)-ones via One-Pot Multi-Component Reaction by Using Cuttlebone as a Natural Catalyst under Solvent-Free Conditions","authors":"Nooshin Firoozeh, S. Rezazadeh, C. Izanloo","doi":"10.29356/JMCS.V61I3.350","DOIUrl":"https://doi.org/10.29356/JMCS.V61I3.350","url":null,"abstract":"In this paper, an efficient, green and eco-friendly method for synthesis of 3,4-dihydropyrimidin-2(1 H )-ones via one-pot multi-component reaction of aldehydes, urea and ethyl acetoacetate is shown at the presence of cuttlebone as an effective, reusable and natural heterogeneous catalyst. The advantages of this method are short reaction times, high yields, simple work-up, and reusable natural catalysts. The structure of cuttlebone was characterized by FT-IR spectrum, scanning electron microscopy (SEM) and energy dispersive spectrometer (SEM-EDS).","PeriodicalId":21347,"journal":{"name":"Revista de la Sociedad Química de Mexico","volume":"27 1","pages":"241-249"},"PeriodicalIF":0.0,"publicationDate":"2017-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86651489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Salimi, Keivan Tahmasobi, C. Karami, A. Jahangiri
Modified nano-silica with Bismuth and Iron adsorbent was synthesized to be used as an effective adsorbent material for methylene blue (MB) removal from water solution. The prepared samples were characterized using SEM, FTIR, XRD and TEM. The effect of experimental parameters such as pH, contact time and initial concentration on adsorption treatment were studied. Results indicated that the optimum conditions for maximum adsorption of 20 mg/L MB were: contact time of 20 minutes, pH= 5-6 and 8 gr/L adsorbent, the remaining MB in solution was 1.75%. Langmuir and Freundlich isotherms were employed to model the experimental results and the Freundlich isotherm was the best-fitting models for the experiment results. The kinetic data were also analyzed through pseudo-first-order and pseudo-second-order models. The pseudo-second-order kinetic model well depicted the kinetics of dyes adsorption on adsorbent.
{"title":"Preparation of Modified nano-SiO2 by Bismuth and Iron as a novel Remover of Methylene Blue from Water Solution","authors":"F. Salimi, Keivan Tahmasobi, C. Karami, A. Jahangiri","doi":"10.29356/JMCS.V61I3.351","DOIUrl":"https://doi.org/10.29356/JMCS.V61I3.351","url":null,"abstract":"Modified nano-silica with Bismuth and Iron adsorbent was synthesized to be used as an effective adsorbent material for methylene blue (MB) removal from water solution. The prepared samples were characterized using SEM, FTIR, XRD and TEM. The effect of experimental parameters such as pH, contact time and initial concentration on adsorption treatment were studied. Results indicated that the optimum conditions for maximum adsorption of 20 mg/L MB were: contact time of 20 minutes, pH= 5-6 and 8 gr/L adsorbent, the remaining MB in solution was 1.75%. Langmuir and Freundlich isotherms were employed to model the experimental results and the Freundlich isotherm was the best-fitting models for the experiment results. The kinetic data were also analyzed through pseudo-first-order and pseudo-second-order models. The pseudo-second-order kinetic model well depicted the kinetics of dyes adsorption on adsorbent.","PeriodicalId":21347,"journal":{"name":"Revista de la Sociedad Química de Mexico","volume":"18 1","pages":"250-259"},"PeriodicalIF":0.0,"publicationDate":"2017-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87180213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Imidazole-based polyamides (PA)s and polyimides (PI) s were prepared from condensation of a new aromatic heterocyclic diamine, 4,4›(4,4›-(2-(4-(triflouromethyl)phenyl)-1H-imidazole-4,5-dyl)bis(4,1-phenylen))bis(oxy)bis(3-(4,5-diphenyl-1H-imidazole-2-yl)aniline), with various diacids and dianhydrides, respectively. The structure of diamine, PAs and PIs were fully characterized by using elemental analysis, FT-IR, 1 H NMR and 13 C NMR techniques. Also, adsorption capability of these polymers for removal of heavy metal ions such as Co 2+ , Cr 3+ , Cd 2+ , Hg 2+ and Pb 2+ from aqueous solutions was also tested at pH 7-8. The PAs and PIs showed good solubility in aprotic polar organic solvents with high thermal stability exhibiting the glass transition temperatures (T g )s and 10% weight loss temperatures (T 10 %) in the range of 220-286 °C and 383-435 °C for PAs and 251-307 °C and 407-512 °C for PIs.
{"title":"Synthesis, Characterization and Heavy Metal Ion Adsorption Behavior of Imidazole-Based Novel Polyamides and Polyimides","authors":"B. Soleimani, M. Taghavi, M. Ghaemy","doi":"10.29356/JMCS.V61I3.349","DOIUrl":"https://doi.org/10.29356/JMCS.V61I3.349","url":null,"abstract":"Imidazole-based polyamides (PA)s and polyimides (PI) s were prepared from condensation of a new aromatic heterocyclic diamine, 4,4›(4,4›-(2-(4-(triflouromethyl)phenyl)-1H-imidazole-4,5-dyl)bis(4,1-phenylen))bis(oxy)bis(3-(4,5-diphenyl-1H-imidazole-2-yl)aniline), with various diacids and dianhydrides, respectively. The structure of diamine, PAs and PIs were fully characterized by using elemental analysis, FT-IR, 1 H NMR and 13 C NMR techniques. Also, adsorption capability of these polymers for removal of heavy metal ions such as Co 2+ , Cr 3+ , Cd 2+ , Hg 2+ and Pb 2+ from aqueous solutions was also tested at pH 7-8. The PAs and PIs showed good solubility in aprotic polar organic solvents with high thermal stability exhibiting the glass transition temperatures (T g )s and 10% weight loss temperatures (T 10 %) in the range of 220-286 °C and 383-435 °C for PAs and 251-307 °C and 407-512 °C for PIs.","PeriodicalId":21347,"journal":{"name":"Revista de la Sociedad Química de Mexico","volume":"11 1","pages":"229-240"},"PeriodicalIF":0.0,"publicationDate":"2017-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82886062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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