Qx. Wu et Ln. Zhang, Preparation and characterization of thermoplastic starch mixed with waterborne polyurethane, IND ENG RES, 40(2), 2001, pp. 558-564
A polyester-type waterborne polyurethane (WPU) was synthesized with 2,4-tol
ylene diisocyanate (TDI), poly-1,4-butylene glycol adipate (PBA), and 2,2-b
is-(hydroxylmethyl) propionic acid (DMPA). A series of compression-molded s
heets coded as STPU were prepared by mixing thermoplastic starch (TPS) with
the desired amount of WPU. The properties and structure of the sheets TPS,
STPU, and WPU were investigated by tensile tests, wide X-ray diffraction p
atterns (WXRDPs), differential scanning calorimetry, infrared spectroscopy,
ultraviolet spectroscopy, and scanning electron microscopy. The results sh
owed that the tensile strength, breaking elongation, and water resistance o
f the STPU sheets were all higher than that of TPS, when the WPU content wa
s in the range from 5 to 30 wt %. The STPU sheets were found to have higher
crystallinity than WPU and amorphous TPS and slightly lower light transimi
tance than TPS, suggesting that partially recrystallized starch formed. The
WPU plays an important role in the formation of new morphology and in the
enhancement of the mechanical properties of the STPU sheet. The compression
-molded STPU sheets provided a potential application in the field of biodeg
radable materials.