Effects of Hydroxyl-Terminated Polycaprolactone Oligomers on the Properties of PBAT
Three low relative molecular weight hydroxyl-terminated polycaprolactones(LMWPCLs)were synthesized using ε-caprolactone and 1,4-butanediol as monomers.The relative molecular weights and structures of LMWPCLs were characterized by gel permeation chromatography,Fourier transform infrared spectroscopy,and proton nuclear magnetic resonance spectroscopy.Using LMWPCL9000,LMWPCL7000,and LMWPCL5000 with the number-average molecular weights of 9 000,7 000,and 5 000 respectively as chain extenders,LMWPCLs were melt-blended with polybutylene adipate terephthalate(PBAT)to prepare a series of PBAT/LMWPCL blends with different mass fractions of LMWPCLs.The effects of three chain extenders on the thermal properties,mechanical properties,and rheological properties of PBAT/LMWPCL blends were investigated.The results show that as the mass fractions of LMWPCLs increase,the complex viscosity,storage modulus,and loss modulus of the blends all increase significantly.Among them,LMWPCL7000 has the best chain extension effect.The addition of LMWPCL maintains the good heat resistance of PBAT and significantly improves the tensile strength and elongation at break of PBAT.When a 2％mass fraction LMWPCL9000 is added,the tensile strength(33.86 MPa)and elongation at break(1 970.96％)of the blend are respectively increased by 51％and 46％compared with pure PBAT.LMWPCL is biodegradable and expected to replace the traditional petroleum-based chain extenders,showing potential application prospects in the PBAT blend modification field.
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