Thermoplastic starch matrix plasticized by single/compound plasticizer in starch-based composites

In order to promote the combination of the starch matrix and fiber pretreated in the composites and solve the problem of the recrystallization of thermoplastic starch,this paper respectively takes formamide,urea,glycerol and glycol as the plasticizer by the proportion of 10∶2,10∶3,10∶4.From FT-IR spectra,the plasticizer plasticized starch mainly through the intermolecular hydrogen bonding with—OH in starch molecules,and the optimal rate of starch:plasticizer is 10∶3.And the hydrogen bonding between formamide and starch was strongest and the plasticizing effect was the best.X-ray diffraction curves have shown that the crystallinity of formamide-urea compound plasticizing TPS is lowest and less than 1.5%.And the optimal formula of compound plasticizer is formamide∶urea=2∶1.Fiber-starch schematic of water's bridge-connection showed good adhesion between TPS matrix and fibers.