Preparation and properties of PBAT/PGA blends with two-step blending method
Blend of poly(butylene adipate-co-terephthalate)/polyglycolic acid(PBAT/PGA)were prepared by two-step blend-ing method,where multi-component epoxy compound(ADR)was used as a chain extender and reactive compatibilizer.First,the binary pre-mixture of PBAT/PGA was obtained through melt blending at a higher temperature of 235℃,and then ADR was added into the PBAT/PGA blend with a lower blending temperature of 170℃.As a result,the two-step blends of PBAT/PGA/ADR were prepared successfully.PBAT/PGA/ADR blends with the same ratios prepared by the common one-step blending method served as a comparison.The effects of different processing methods and ADR content on the rheological behavior,microstructure and tensile performance of the blends were investigated in detail.The results indicate that the two-step blending method could maintain a larger size of the PGA dispersion domains while simultaneously improving the interfacial compatibility between PBAT matrix and PGA domains.Compared to the binary PBAT/PGA(65/35)blends and the blends prepared by the one-step blending method,the blends prepared by the two-step blending method exhibit more balanced properties in terms of tensile yield strength,tensile modulus,and elongation at break.For instance,with an ADR content of 0.8 phr,tensile yield strength,tensile modulus,and elongation at break of(PBAT/PGA)/ADR(65/35/0.8)blend could reach 11.57 MPa,160.88 MPa,and 309.5%,respectively.Furthermore,the testing results demonstrate that the chain extension/branching reaction of ADR has a more significant impact on the rheological behavior of the blends prepared by the one-step blending method compared to the ones prepared by the two-step blending method.
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