Radiation-induced graft polymerization of chitosan onto poly(3-hydroxybutyrate).
Chitosan is among the most studied biopolymers and offers important advantages, such as biodegradability, biocompatibility and nontoxicity. In this study, this polysaccharide was grafted onto poly(3-hydroxybutyrate) using the simultaneous gamma-irradiation-initiated polymerization method. The polyester was immersed in diverse solvents, which allowed the preparation of graft copolymers with different yields and crystallinities. A successful synthesis and the estimation of the degree of crystallinity were verified by spectroscopic and calorimetric techniques. The most suitable method was found to be the thermoanalytical approach because it displayed a linear relationship between the degree of crystallinity and the increasing degree of grafting. The results also indicated that the lowest degree of grafting was seen for acetic acid (14.27%), while the highest degree corresponded to ethyl acetate (32.11%). The mechanism of grafting was proposed on the basis of the experimental results.
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Campus Juriquilla, Boulevard Juriquilla 3001, Santiago de Querétaro, Querétaro C.P 76230, Mexico. Electronic address: mikegcu@fata.unam.mx.
Maykel González
MG
Torres
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Campus Juriquilla, Boulevard Juriquilla 3001, Santiago de Querétaro, Querétaro C.P 76230, Mexico. Electronic address: vmsu@unam.mx.
Susana Vargas
SV
Muñoz
Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna Hermosillo, #140 Col. San José de los Cerritos, Saltillo, Coahuila CP 25294, Mexico. Electronic address: silvia.solis@ciqa.edu.mx.
Silvia G Solís
SG
Rosales
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Apartado, Postal 70-543, México, D.F. 04510, Mexico. Electronic address: pilar@nucleares.unam.mx.
Ma del Pilar
Mdel P
Carreón-Castro
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Campus Juriquilla, Boulevard Juriquilla 3001, Santiago de Querétaro, Querétaro C.P 76230, Mexico. Electronic address: resparza@fata.unam.mx.
Rodrigo Alonso Esparza
RA
Muñoz
Universidad Autónoma Metropolitana, Av. San Rafael Atlixco N° 186, Col. Vicentina, Del. Iztapalapa, C.P. 09340 México D.F., Mexico. Electronic address: oagr@xanum.uam.mx.
Roberto Olayo
RO
González
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Campus Juriquilla, Boulevard Juriquilla 3001, Santiago de Querétaro, Querétaro C.P 76230, Mexico. Electronic address: miries@fata.unam.mx.
Miriam Rocío Estévez
MR
González
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Campus Juriquilla, Boulevard Juriquilla 3001, Santiago de Querétaro, Querétaro C.P 76230, Mexico. Electronic address: rogelior@unam.mx.
Rogelio Rodríguez
RR
Talavera
D048271:Chitosan / Q000737:chemistry*; D006885:Hydroxybutyrates / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D011091:Polyesters / Q000737:chemistry*; D058105:Polymerization; D011854:Radiochemistry; D000094122:Polyhydroxybutyrates
D048271:Chitosan; D006885:Hydroxybutyrates; D011091:Polyesters; C003182:poly-beta-hydroxybutyrate; D000094122:Polyhydroxybutyrates
Chitosan; Degree of crystallinity; Degree of grafting; Gamma irradiation; Graft polymerization; Poly(3-hydroxybutyrate)