SUSCEPTIBILITY OF ENHANCED ENVIRONMENTALLY DEGRADABLE POLYETHYLENE TO THERMAL AND PHOTOOXIDATION
SUSCEPTIBILITY OF ENHANCED ENVIRONMENTALLY DEGRADABLE POLYETHYLENE TO THERMAL AND PHOTOOXIDATION
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DOI：
10.1016/0141-3910(92)90080-o
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发表时间：
1992-01-01
影响因子：
5.9
通讯作者：
KARLSSON, S
中科院分区：
文献类型：
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作者：
ALBERTSSON, AC;BARENSTEDT, C;KARLSSON, S
含有可生物降解淀粉填料、促氧化剂配方和热稳定剂的 LDPE 薄膜在 100 摄氏度和 60 摄氏度（模拟堆肥温度）的空气环境中进行加速热老化，并在气候计中进行紫外线老化。通过化学发光（CL）、傅里叶变换红外光谱（FTIR）、差示扫描量热法（DSC）、高温尺寸排阻色谱（HTSEC）和扫描电子显微镜（SEM）监测降解情况。通过气相色谱-质谱法（GC-MS）检测挥发性降解产物。所有这些技术表明样品容易受到热氧化和光氧化的影响，尤其是前者。发现含有玉米淀粉作为唯一添加剂的 LDPE 不会降解，这表明促氧化剂配方是造成观察到的降解的原因。
LDPE films containing a biodegradable starch filler, a pro-oxidant formulation and a thermal stabilizer were subjected to accelerated thermal ageing in an air environment at 100-degrees-C and 60-degrees-C (simulating composting temperatures) and to UV ageing in a weatherometer. Degradation was monitored by chemiluminescence (CL), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), high-temperature size-exclusion chromatography (HTSEC) and scanning electron microscopy (SEM). Volatile degradation products were detected by gas chromatography-mass spectrometry (GC-MS). All these techniques indicated that the samples were susceptible to thermal and photo-oxidation, particularly the former. LDPE containing corn starch as the sole additive was found not to be degraded, suggesting that the pro-oxidant formulation was responsible for the observed degradation.