Thermal and Mechanical Properties of Thermoplastic Starch and Poly(Vinyl Alcohol-Co-Ethylene)Blends

• 作者: Ana Clara Lancarovici Alves Antonio José Felix Carvalho Rafael Grande
• 来源期刊: 可再生材料杂志(英文)
• 学科: 化学
• 关键词: THERMOPLASTIC STARCH EVOH polymer BLENDS thermal PROPERTIES of POLYMERS mechanical PROPERTIES of POLYMERS
• 年，卷（期）: 2019,（3）
• 页码范围: 245-252
• 页数: 8页
• 分类号: O63

摘要

The interest in thermoplastic starch(TPS)as a substitute material to replace conventional thermoplastics continues especially due its biodegradability,availability,low cost and because it is obtained from renewable sources.However,its poor mechanical properties and its high sensitivity to humidity have limited its use in several applications.Here,the copolymer poly(ethylene-co-vinyl alcohol)(EVOH),with two different ethylene contents,27 and 44 mol%were blended with TPS by extrusion in order to overcome these limitations.The obtained blends were characterized by thermogravimetric analysis(TGA),differential scanning calorimetry(DSC),mechanical tensile testing,Scanning Electron Microscopy(SEM)and moisture absorption test.The addition of EVOH copolymer did not significantly changed the thermal stability of TPS,however it increased the tensile strength in 65%when compared to TPS.The morphology of the blends did not showed two distinct phases,an indication of miscibility or partial miscibility of the components.A decrease of moisture absorption was obtained by the addition of EVOH and is more pronounced for the EVOH with 44% of ethylene.