title: Mechanical Properties of Orthodontic Thermoplastics PETG/ PC2858 after Blending.
abstract: OBJECTIVE
  To characterise and compare the tensile characteristics after multi-proportional blending, to determine the proper blending ratio for new thermoplastic material and to compare its mechanical performance with commercial thermoplastics.
  
  
  METHODS
  PETG and PC2858 aggregates were blended in five different ratios. Standard specimens of each ratio were molded and tested to determine their mechanical performance. Then the new material with the proper blending ratio was chosen and compared against commercial thermoplastics.
  
  
  RESULTS
  With the increase of PC2858 content, the tensile and impact strength increased but elongation at break decreased. When blending ratio (wt %) was 70/30, the PETG/PC2858 exhibited optimal mechanical properties, with a tensile strength of 63.42 ± 1.67 MPa, and a stress relaxation rate of 0.0080 ± 0.0005 N/s, which exceeded those of Erkodur and Biolon.
  
  
  CONCLUSIONS
  By blending PETG and PC2858 at the weight ratio 70/30, we obtained new thermoplastic material which outperformed commercial products.
authors.forename: Yan Song
authors.initials: YS
authors.lastname: Ma
authors.forename: Dong Yu
authors.initials: DY
authors.lastname: Fang
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.forename: Xue Jia
authors.initials: XJ
authors.lastname: Ding
authors.forename: Kun Ya
authors.initials: KY
authors.lastname: Zhang
authors.forename: Yu Xing
authors.initials: YX
authors.lastname: Bai
mesh_terms: D003764:Dental Materials / Q000138:chemical synthesis / Q000737:chemistry*; D004548:Elasticity; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D055595:Mechanical Phenomena; D008567:Membranes, Artificial; D009967:Orthodontic Appliances; D010969:Plastics / Q000138:chemical synthesis / Q000737:chemistry*; D011076:Polycarboxylate Cement / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D011093:Polyethylene Terephthalates / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D003764:Dental Materials; D008567:Membranes, Artificial; D010969:Plastics; D011076:Polycarboxylate Cement; D011093:Polyethylene Terephthalates; C475920:polyethylene terephthalate glycol; C005506:polycarbonate; D011092:Polyethylene Glycols