Characterisation of thermally treated and untreated polyethylene-polypropylene blends using DSC, TGA and IR techniques
Characterisation of thermally treated and untreated polyethylene-polypropylene blends using DSC, TGA and IR techniques
复制标题
DOI：
10.1179/146580109x12473409436625
复制
发表时间：
2009-10-01
影响因子：
2
通讯作者：
Madkour, T. M.
中科院分区：
文献类型：
--
作者：
Mourad, A. -H. I.;Akkad, Rania O.;Madkour, T. M.
研究了经热处理和未经热处理的极低密度聚乙烯、等规聚丙烯及其共混物的热特性。制备了含有五种不同重量百分比的VLDPE/iPP的注塑共混物，并在100℃下热处理2、4、7和14天。采用差示扫描量热法、热重法和红外光谱分析技术，研究了热处理和掺合比例对其热稳定性和化学稳定性的影响。PE的加入使PP主熔融峰的T(m)、熔合热和结晶度降低，表明两种聚合物部分可混相。T(m)随时效时间的延长而增大，但对熔合热的影响不明显。计算了动态氮气气氛下的初始分解温度、最终分解温度、最高分解速率温度、分解反应顺序、活化能和活化焓，并从掺合比和时效时间等方面进行了讨论。不同老化时间的共混物红外光谱均未见降解产物。
The thermal characteristics of thermally treated and untreated very low density polyethylene, isotactic polypropylene and their blends were investigated. Injection moulded blends containing five different weight percentages of VLDPE/iPP were prepared and thermally treated at 100 degrees C for 2, 4, 7 and 14 days. Differential scanning calorimetry, thermogravimetry and infrared spectral analysis techniques were used to study the effect of thermal treatment and blending ratio on the thermal and chemical stability. The addition of PE had caused the T(m), heat of fusion and percentage crystallinity of PP main melting peak to decrease, indicating that both polymers are partially miscible. T(m) has been found to increase with aging time, however, the heat of fusion is not significantly affected. The initial and final decomposition temperatures, maximum decomposition rate temperature, order of decomposition reaction, activation energy and activation enthalpy were calculated, in a dynamic nitrogen atmosphere, and discussed in terms of blending ratios and aging times. The IR spectra of all blends at different aging times do not show any degradation products.