ZnS Nanocrystals as an Additive for Gamma-Irradiated Poly (Vinyl Chloride)

• Autor(a) principal: Silva,Roberta Cristina da
• Data de Publicação: 2017
• Outros Autores: Silva,Lindomar Avelino da, Araújo,Patricia Lopes Barros de, Araújo,Elmo Silvano de, Santos,Renata Francisca da Silva, Aquino,Kátia Aparecida da Silva
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Materials research (São Carlos. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000800851
• topic: Zinc sulfide nanocrystals; sonochemical synthesis; radiolytic degradation; stabilization

Zinc sulfide (ZnS) was synthesized by sonochemical method and nanoparticles with crystallite size around 2 nm were obtained. PVC containing ZnS nanoparticles at concentrations of 0.10; 0.30; 0.50; 0.7 and 1.00 wt% were gamma irradiated (60Co) at room temperature in air. No appreciable decrease in PVC Viscosity-Average Molar Mass (Mv) was observed for samples containing 0.7 wt% of ZnS nanocrystals. It was demonstrated that the addition of ZnS nanocrystals imparted molecular protection to the polymer matrix while improving flexibility, by decreasing the Young Modulus of PVC films. These results suggest the use of sonochemically synthesized ZnS nanocrystals as a new additive for radiation-grade PVC materials.