The purpose of this study is to replace the existing synthetic kraft paper with a biodegradable PLA-PCL kraft paper that can serve as a valuable coated abrasive and packaging products replacing the conventional petroleum based products. PCL toughens the brittle PLA polymer due to its plasticizing action. The toughening effect of 10% PCL in PLA is found to be maximum towards improving its better set of properties than that of neat PLA and other PLA-PCL compositions. Accordingly, the percentage of PCL in PLA was optimized to 10%. It was interesting to observe that PCL increases the crystallinity of the PLA, which enables the PLA-PCL blend to exhibit better gas barrier behaviour on Kraft paper. Furthermore, the blend also showed better heat seal strength with the highest value of 76.6 kPa at 10% of its content. FT-IR analysis confirmed the possible interaction that occurred between PLA and PCL, due to which a shift in vibration frequency of the PLA carbonyl group is observed. DSC analysis shows that PLA is completely miscible with 10 wt % of PCL exhibiting a melting peak at 148.8 °C with its corresponding enthalpy value at 29.14 J.g⁻¹ and a crystallinity value of 34.6%. The onset of the second heating crystallization temperature was noticed at 76.9 °C, and the enthalpy at 19.82 J.g⁻¹. Furthermore, this work proves that blending of PCL with PLA enhances the properties of PLA, which can be exploited for making industrially valuable products.

这项研究的目的是用可生物降解的PLA-PCL牛皮纸代替现有的合成牛皮纸，该牛皮纸可作为有价值的涂层磨料和包装产品，代替传统的石油基产品。PCL由于其增塑作用而使脆性的PLA聚合物增韧。已发现，与纯PLA和其他PLA-PCL组合物相比，在PLA中含10％PCL的增韧效果最大，可改善其更好的性能。因此，PLA中PCL的百分比被优化为10％。有趣的是，PCL增加了PLA的结晶度，这使PLA-PCL共混物在牛皮纸上表现出更好的阻气性。此外，共混物还显示出更好的热封强度，在其含量的10％时最高值为76.6 kPa。FT-IR分析证实了PLA和PCL之间可能发生的相互作用，因此可以观察到PLA羰基振动频率的变化。DSC分析表明，PLA与10 wt％的PCL完全可混溶，在148.8°C时显示出熔融峰，其相应的焓值为29.14 Jg。^-1和结晶度值为34.6％。注意到第二加热结晶温度的开始为76.9℃，并且焓为19.82Jg ^-1。此外，这项工作证明了PCL与PLA的共混会增强PLA的性能，可用于制造具有工业价值的产品。