eprintid: 2017 rev_number: 6 eprint_status: archive userid: 2 dir: disk0/00/00/20/17 datestamp: 2023-06-13 23:30:06 lastmod: 2023-06-13 23:30:06 status_changed: 2023-06-13 23:30:06 type: article metadata_visibility: show creators_name: Pali-Casanova, Ramón creators_name: Loría-Bastarrachea, María creators_name: Aguilar-Vega, M. J. creators_name: Zavala-Loría, José creators_name: Dzul Lopez, Luis creators_name: Yam Cervantes, Marcial Alfredo creators_id: creators_id: creators_id: creators_id: creators_id: luis.dzul@unini.edu.mx creators_id: title: Structure effect on mechanical and thermal properties in aromatic copolyamides with phenyl substituents ispublished: pub subjects: uneat_eng divisions: uninimx_produccion_cientifica full_text_status: none keywords: Aromatic polyamides; Polycondensation; Mechanical and thermal properties; Fractional free volume abstract: Six aromatic copolyamides contanining phenyl groups were synthesized and characterized. The concentrations of the para-linked phenyl groups and meta-linked phenyl groups were varied systematically on the copolymers general structure to obtain a set of random copolyamides. Effect of copolymerization on glass transition temperature (Tg), tensile modulus (E), Tensile strength (σ) were measured. Changes in density were determined to estimate the effect on Fractional Free Volume (FFV). Results indicate that the substitution of para-linked phenyl group by meta-linked phenyl group causes an increase in tensile modulus E and tensile strength a decrease in Tg. The observed results are attributed to the asymmetric position of the linkages in the TERE and ISO isomers, because symmetric linkages, such as TERE, induces a higher packing of the polyamide chains while the asymmetry of ISO isomer inhibits packing causing an expansion in the FFV. date: 2019 publication: Journal of Polymer Research volume: 26 number: 10 id_number: doi:10.1007/s10965-019-1900-8 refereed: TRUE issn: 1022-9760 official_url: http://doi.org/10.1007/s10965-019-1900-8 access: close language: en citation: Artículo Materias > Ingeniería Universidad Internacional Iberoamericana México > Investigación > Producción Científica Cerrado Inglés Six aromatic copolyamides contanining phenyl groups were synthesized and characterized. The concentrations of the para-linked phenyl groups and meta-linked phenyl groups were varied systematically on the copolymers general structure to obtain a set of random copolyamides. Effect of copolymerization on glass transition temperature (Tg), tensile modulus (E), Tensile strength (σ) were measured. Changes in density were determined to estimate the effect on Fractional Free Volume (FFV). Results indicate that the substitution of para-linked phenyl group by meta-linked phenyl group causes an increase in tensile modulus E and tensile strength a decrease in Tg. The observed results are attributed to the asymmetric position of the linkages in the TERE and ISO isomers, because symmetric linkages, such as TERE, induces a higher packing of the polyamide chains while the asymmetry of ISO isomer inhibits packing causing an expansion in the FFV. metadata Pali-Casanova, Ramón; Loría-Bastarrachea, María; Aguilar-Vega, M. J.; Zavala-Loría, José; Dzul Lopez, Luis y Yam Cervantes, Marcial Alfredo mail SIN ESPECIFICAR, SIN ESPECIFICAR, SIN ESPECIFICAR, SIN ESPECIFICAR, luis.dzul@unini.edu.mx, SIN ESPECIFICAR (2019) Structure effect on mechanical and thermal properties in aromatic copolyamides with phenyl substituents. Journal of Polymer Research, 26 (10). ISSN 1022-9760