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首页> 外文期刊>Journal of Applied Polymer Science >Influence of previous annealing on first stage of degradation of blends of low-density polyethylene and mater-Bi AF05H aged in soil: Comparative thermal analysis study
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Influence of previous annealing on first stage of degradation of blends of low-density polyethylene and mater-Bi AF05H aged in soil: Comparative thermal analysis study

机译：预先退火对土壤中老化的低密度聚乙烯和Mater-Bi AF05H共混物降解第一阶段的影响：比较热分析研究

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Samples of low-density polyethylene (LDPE) filled with a commercial biodegradable material (Mater-Bi AF05H) were subjected to an accelerated soil burial test in a culture oven. In addition, another series of these blends was subjected to thermal treatment and afterward buried in soil under the same conditions. Comparative studies of the changes in the thermal stability and the structural and morphological properties of the samples were carried out by means of differential scanning calorimetry, dynamic mechanical thermal analysis, and thermogravimetric analysis. The morphological properties under study were the melting temperature, the crystalline content, and the lamellar thickness distribution. The alpha(I) relaxation zone of the mechanical spectra was characterized in terms of tan delta, whereas the alpha(II), and relaxation zones were characterized in terms of E" according to the Fuoss-Kirkwood equation and with the help of a deconvolution method. Finally, the kinetics of each thermodegradation process was studied using the Broido integral method. The Mater-Bi hindered the uniform growth of crystallites in PE and facilitate molecular motions, but the thermal treatment seemed to rearrange the crystallites in the crystalline phase of PE and promote segregation of the crystallite sizes. These molecular reorganizations affected the degradation process so that the degradation of the polymeric matrix seemed to be obstructed by the annealing during the first 120 days of aging in soil and only the Mater-Bi degradation could be observed. (C) 2003 Wiley Periodicals, Inc. [References: 18]
机译：填充有商业可生物降解材料（Mater-Bi AF05H）的低密度聚乙烯（LDPE）样品在培养箱中进行加速的土壤掩埋测试。另外，将这些混合物的另一系列进行热处理，然后在相同条件下埋入土壤中。通过差示扫描量热法，动态机械热分析和热重分析对样品的热稳定性，结构和形态特性的变化进行了比较研究。所研究的形态学性质是熔融温度，晶体含量和层状厚度分布。根据Fuoss-Kirkwood方程并借助去卷积，以tanδ表示机械谱的alpha（I）弛豫区，而以E“表示alpha（II）和弛豫区。最后，使用Broido积分方法研究了每个热降解过程的动力学，Mater-Bi阻碍了PE中微晶的均匀生长并促进了分子运动，但热处理似乎使PE的晶相中的微晶重新排列。这些分子重组影响降解过程，因此在土壤老化的前120天中，退火似乎阻碍了聚合物基质的降解，并且只能观察到Mater-Bi降解。 （C）2003 Wiley Periodicals，Inc. [参考：18]

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