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通过熔融共混法制备了一系列的PLA/PAA共混物,考察了PLA/PAA共混体系的流变行为和热性能(结晶行为和热降解行为).FTIR测试结果证实PLA与PAA分子链之间形成了氢键网络.动态剪切流变测试和DSC测试均表明共混体系的流变行为和冷结晶行为会随着PAA含量的改变而改变,这可能是由于PLA与PAA的氢键作用受到PAA含量的影响.另外,DSC测试证实共混体系中的氢键网络还会受到试样热历史的影响.当PAA含量较低(低于5 wt%)时,PLA/PAA共混体系中PAA与PLA熔体两相的相分离不严重,使得PAA与PLA分子链能够较大限度地接触而形成较强的氢键作用,因而可以明显减缓增塑作用对黏度降低的影响.
A series of PLA / PAA blends were prepared by melt blending, and the rheological behavior and thermal properties (crystallization behavior and thermal degradation behavior) of PLA / PAA blends were investigated. The results of FTIR test showed that PLA / PAA chains Hydrogen bond network formed between the dynamic shear rheological test and DSC tests show that the blends rheological behavior and cold crystallization behavior will change with changes in PAA content may be due to the PLA and PAA hydrogen bonds In addition, the DSC test confirmed that the hydrogen bond network in the blends was also affected by the thermal history of the samples.When the content of PAA was low (below 5 wt%), the PLA / PAA blends In PAA and PLA melt phase separation is not serious, making PAA and PLA molecular chain can contact with a greater extent to form a strong hydrogen bond, which can significantly reduce the plasticizing effect on the viscosity decreased.