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首页> 外文会议>Regional Conference of the Polymer Processing Society >Crystallization of PHB/Carbon Black Compounds. Effect of Heating and Cooling Cycles
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Crystallization of PHB/Carbon Black Compounds. Effect of Heating and Cooling Cycles

机译：PHB /炭黑化合物的结晶。加热和冷却循环的影响

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摘要

In this work compounds of poly(3- hydroxybutyrate) (PHB) and carbon black (CB) with CB content ranging between 0.5% and 10.0% were prepared in a laboratory internal mixer. The effect of heating and cooling rates on the crystallization of PHB/CB compounds was investigated by differential scanning calorimeter (DSC), and its morphology was analyzed by optical microscopy (OM). Several rates, ranging from 2 to 32°C/min, were utilized to analyze the phase change during heating/cooling/reheating cycles and several magnifications were applied during morphologic study of the spherulitic structure. The results showed that PHB and its compounds crystallize partially from the melt during cooling cycle and cold crystallizes partially on reheating, and that the relative amount of polymer crystallizing in each stage depends strongly on the cooling rate. The melting and cold crystallization temperatures as well as the rates of phase change were found to depend strongly of cooling and heating rates and of CB content. CB behaves as a nucleant promoting the melt and cold crystallization of PHB as well as increasing the number of spherulites. Optical microscopy images suggest that crystallization of PHB continues during storage for 24 hours, at ambient temperature.
机译：在聚有CB含量为0.5％和10.0％之间的范围内这一工作化合物（3-羟基丁酸酯）（PHB）和炭黑（CB）是一个实验室密炼机制备。加热和PHB的结晶冷却速率的效果/ CB化合物通过差示扫描量热计（DSC）研究，并且其形态通过光学显微镜（OM）进行分析。几个率，范围从2至32℃/ min时，被利用的/受加热时来分析相变冷却/再加热循环和球晶结构的形态学研究期间施加几个倍率。结果表明，PHB及其化合物冷却循环期间部分地从熔体结晶和冷结晶部分再加热，并且在每个阶段中结晶聚合物的相对量上的冷却速度强烈地依赖。熔融和冷结晶温度，以及相变化率被发现取决于冷却和加热速率和CB含量的强烈。 CB表现为成核促进PHB的熔融和冷结晶以及增加球晶的数量。光学显微镜图像表明PHB的结晶化存储24小时期间的继续，在环境温度下。

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