Here we report on kinetic analysis of thermal degradation of polymer blends based on incremental isoconversional method coupled with mathematical deconvolution of thermogravimetric curves based on Fraser–Suzuki peak function. The measured kinetic envelope was decomposed into contributions approximately corresponding to degradation of each constituent of a polymer blend. Kinetic parameters from isoconversional analysis were further used for estimating the effect of blending on thermal stability of the constituents. Compared to routinely used parameters such as degradation onset temperature or DTG-peak temperature, the deconvolution analysis allows to determine stability of all components in a mixture regardless of their relative content. Here we also show that deconvolution analysis can be carried out directly on integral () curves, thus bypassing the work with differential data /. Isoconversional analysis of deconvoluted () curves allows to calculate various parameters for assessing the potentially accelerating or inhibiting effect on thermal degradation, for example, by means of decomposition half-time . The results can be made more robust by utilizing relative criteria for stability such as (blend)/(neat polymer). Using this approach, detrimental effect of PHBV and PBAT on thermal stability of PLA above 300 °C was confirmed. On the other hand, stability of PHBV in both binary and ternary mixtures was improved compared to neat polymer.

中文翻译：

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通过等转化动力学分析评估二元和三元可生物降解聚合物共混物的热稳定性


在这里，我们报告了基于增量等转化方法以及基于 Fraser-Suzuki 峰函数的热重曲线数学解卷积的聚合物共混物热降解动力学分析。测得的动力学包络被分解为大约对应于聚合物共混物的每种成分的降解的贡献。来自等转化分析的动力学参数进一步用于估计共混对成分热稳定性的影响。与常规使用的参数（例如降解起始温度或 DTG 峰值温度）相比，反卷积分析可以确定混合物中所有组分的稳定性，无论其相对含量如何。这里我们还表明，反卷积分析可以直接在积分（）曲线上进行，从而绕过微分数据/的工作。解卷积 () 曲线的等转换分析允许计算各种参数，以评估对热降解的潜在加速或抑制作用，例如，通过分解半衰期。通过利用稳定性的相对标准，例如（共混物）/（纯聚合物），可以使结果更加可靠。使用这种方法，证实了 PHBV 和 PBAT 对 300 °C 以上的 PLA 热稳定性的不利影响。另一方面，与纯聚合物相比，二元和三元混合物中 PHBV 的稳定性均得到改善。