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Effect of reactive blocked polyisocyanate on the properties of solvent cast blends from poly(lactic acid) and poly(ethylene glycol)
Author(s) -
Shen Tengfei,
Lu Mangeng,
Zhou Dewen,
Liang Liyan
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.36276
Subject(s) - differential scanning calorimetry , crystallinity , materials science , ethylene glycol , dynamic mechanical analysis , chemical engineering , peg ratio , lactic acid , polymer chemistry , crystallization , polymer blend , solvent , scanning electron microscope , composite material , polymer , organic chemistry , chemistry , copolymer , physics , genetics , finance , biology , bacteria , engineering , economics , thermodynamics
Poly(lactic acid) (PLA)/poly(ethylene glycol) (PEG) blends containing reactive ethyl cellosolve‐blocked polyisocyanate (EC‐bp) as a crosslinking agent with the goal of making sustainable “eco‐friendly materials” were prepared using solvent casting method. Effects of such crosslinking agent and PEG additive on the properties of the prepared blends were investigated and compared. The morphology of the blends, evaluated by environmental scanning electron microscopy (ESEM), indicated that improved interfacial adhesion between PLA and PEG were achieved by the crosslinking effect of EC‐bp. Tensile properties and water resistance were also studied and the results showed that these properties of EC‐bp modified blends were significantly enhanced in comparison with the unmodified ones. Differential scanning calorimetry (DSC) and X‐ray diffraction (XRD) results showed that the degree of crystallinity (χ c ) of the blends was enhanced in the presence of PEG domains, whereas crystallization rate was decreased by addition of EC‐bp. Dynamical mechanical analysis (DMA) showed that enhanced storage modulus and heat resistance of the blends were obtained when EC‐bp was introduced as a crosslinking agent. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012