Urea and formamide as a mixed plasticizer for thermoplastic starch

作者：Ma XF; Yu JG^*; Jin F

来源：Polymer International, 2004, 53(11): 1780-1785.

DOI：10.1002/pi.1580

• thermoplastic starch
• retrogradation
• formamide
• urea

Mixtures of urea and formamide were tested as plasticizers for thermoplastic starch (TPS). The hydrogen bonding interactions between urea/formamide and starch were investigated by using Fourier-transform infrared spectroscopy (FT-IR). The thermal stability, mechanical properties and starch retrogradation behavior were also studied by thermogravimetric analysis (TGA), tensile testing and X-ray diffraction (XRD), respectively. TPS plasticized by urea (20 wt%) and formamide (10 wt%) showed better thermal stability and water resistance than conventional TPS plasticized by glycerol. Moreover, the tensile stress, strain and energy at break, respectively, reached 4.83 MPa, 104.6% and 2.17 N m after storing in an atmosphere of relative humidity (RH) of 33% for one week. At the same time, this mixed plasticizer could effectively restrain the retrogradation of starch.

• 出版日期2004-11
• 单位天津大学