Xiao-rong Lan, Xiao-ting Liu, Sun Hua, Zheng-ying Liu, Bang-hu Xie, Ming-bo Yang. EFFECT OF POLY(ACRYLIC ACID) ON THE RHEOLOGICAL AND THERMAL PROPERTIES OF POLY(LACTIC ACID). [J]. Acta Polymerica Sinica (7):922-927(2013)
DOI:
Xiao-rong Lan, Xiao-ting Liu, Sun Hua, Zheng-ying Liu, Bang-hu Xie, Ming-bo Yang. EFFECT OF POLY(ACRYLIC ACID) ON THE RHEOLOGICAL AND THERMAL PROPERTIES OF POLY(LACTIC ACID). [J]. Acta Polymerica Sinica (7):922-927(2013) DOI: 10.3724/SP.J.1105.2013.12324.
EFFECT OF POLY(ACRYLIC ACID) ON THE RHEOLOGICAL AND THERMAL PROPERTIES OF POLY(LACTIC ACID)
Poly(lactic acid)/poly(acrylic acid) blends (PLA/PAA) were prepared by melt blending.The hydrogen-bonding between PLA and PAA was analyzed by Fourier transform infrared spectroscopy (FTIR).The rheological properties
thermal behaviors and the stability of PLA/PAA blends were also investigated by dynamical rheological test
differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).The FTIR results indicated that the hydrogen-bonding interaction was existed in PLA/PAA blends between the oxygen atom of carbonyl (C=O) on PLA and the hydrogen atom of carboxyl acid groups (COOH) on PAA.The rheological behaviors and cold-crystallization behaviors of PLA/PAA blends were changed with the contents of PAA
because the formation of the hydrogen-bonding in PLA/PAA blends was influenced by the contents of PAA.Meanwhile
the hydrogen-bonding networks were also affected by the heating history that the blends underwent.When the content of PAA was lower than 5 wt%
PLA and PAA was partially miscible
which was favorable to the formation of hydrogen-bonding networks between PAA and PLA chains.And the formed hydrogen-bonding networks can partially decrease the effect of plastification of PAA on the viscosity of the blends.However
when the content of PAA was greater than 5 wt%
the phase separation of melt PAA and PLA became serious
which counteracted the formation of hydrogen-bonding.