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Polyamide-1010 samples were irradiated in vacuum at room temperature by Cobalt-60 γ-rays. The free radicals formed in irradiation were studied by means of electron spin resonance (ESR)techniques.The ESRspectra consisted of a quartet and a superimposed singlet which were attributed to radical -CO-NH-CH-CH_2 and -CH_2-C=O, respectively. The effects of temperature and crystaUinity on the radicals were discussed and the mechanism for the production and decay of the radicals was also proposed. 相似文献
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本工作发现,用DSC测定从熔体等速降温时辐照样品的结晶温度Tc随辐照剂量R增加而线性变低,即辐照前后样品的△Tc=Tco-TcR=KR。依据Charlesby-Pinner方程,导出一新关系式,S+S1/2=A+B/△Tc。已经证明,式中的Tc只与聚合物的交联度有关,与辐射交联方法和过程无关。因此,该方程可用于结晶聚合物的强化辐射交联,以获得非无规交联的瞬时G(c,1)值。本文为定量研究结晶聚合物的无规交联与非无规交联提供了一个简便的方法。 相似文献
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