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首页> 外文期刊>Journal of Applied Polymer Science >Thermal franctionation and crystallizatoin ehancement of silane-grafted water-crosslinked low-density polyethylene
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Thermal franctionation and crystallizatoin ehancement of silane-grafted water-crosslinked low-density polyethylene

机译：硅烷接枝水交联低密度聚乙烯的热分馏和结晶增强

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摘要

Thermal fractionations performed using differential scanning calorimetry (DSC) to characterize the heterogeneities in molecular structures of low-density poly-ethylene (LDPE), silane-grafted LDPE (G-LDPE), and silane-grafted water-crosslinked LDPE with gel fractions of 30 and 70 wt % are reported. In regular DSC analyses, LDPE, G-LDPE, and the low gel fraction of crosslinked samples (30 wt %) give one broad endothermic peak at approx 110deg C, whereas the high gel fraction of crosslinked samples (70 wt %) give overlapped multiple endothermic peaks in a much broader temperature range. After thermally fractionated in the range 60-145deg C, LDPE, G-LDPE, and the low gel fraction samples give five to six endothermic peaks in the low-temperature range, whereas the high gel fraction samples give nine peaks, with three additional peaks appearing in the high-temperature range. These multiple peaks correspond to fractions of different molecular structures, with the additional peaks for the high gel fraction samples corresponding to the fraction of molecular segments with low or no branching. This fraction of molecular segments is increasingly extruded out of the gel region with increasing gel fraction by crosslinking and leads to an enhance-ment of crystallization of the sample. This crystallization enhancement behavior is also demonstrated by the X-ray diffraction data and polarized optical micrographs.
机译：使用差示扫描量热法（DSC）进行热分馏，以表征凝胶分数为据报道30和70重量％。在常规DSC分析中，LDPE，G-LDPE和交联样品的低凝胶分数（30 wt％）在大约110°C时给出一个宽的吸热峰，而交联样品的高凝胶分数（70 wt％）则给出了多个重叠在更宽的温度范围内出现吸热峰。在60-145°C的温度范围内进行热分馏后，LDPE，G-LDPE和低凝胶分数样品在低温范围内会产生5至6个吸热峰，而高凝胶分数样品会给出9个峰，另外还有3个峰出现在高温范围内。这些多个峰对应于不同分子结构的馏分，高凝胶馏分样品的附加峰对应于具有低分支或无分支的分子链段的馏分。随着交联的增加，随着凝胶分数的增加，分子片段的这一部分越来越多地从凝胶区域挤出，并导致样品结晶的增强。 X射线衍射数据和偏振光学显微照片也证明了这种结晶增强行为。

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