The internal friction spectra λ = f(T) and the temperature dependence ν = f(T) of the frequency of free damping in the temperature range from –150°C to 120°C of microwave-irradiated and nonirradiated samples of polyvinyl alcohol were obtained. A theoretical analysis of nature of the peak located on the ascending branch of the α-peak of relaxation losses on the internal friction spectrum is carried out, and its disappearance after the microwave irradiation is explained. A comparison of changes in the continuous spectrum of relaxation times in the region of glass-transition temperature is performed. It is established that microwave irradiation expands the spectrum of relaxation time, and, consequently, increases the relaxation microinhomogeneity of the α-relaxation process.

中文翻译：

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微波辐照对聚乙烯醇中α-弛豫过程微不均匀性的影响

内摩擦光谱 λ = f(T) 以及在 –150°C 到 120°C 的温度范围内，聚乙烯醇的微波辐照和未辐照样品的自由阻尼频率的温度依赖性 ν = f(T) 是获得。对位于内摩擦谱松弛损失α峰上升支上的峰的性质进行了理论分析，解释了其在微波照射后的消失。对玻璃化转变温度范围内弛豫时间连续谱的变化进行了比较。已经确定微波辐射扩展了弛豫时间的谱，因此增加了 α-弛豫过程的弛豫微不均匀性。