The objective of this work is to propose a sample preparation procedure implementing a preliminary cold delignification (CD) for the IEC 60450 DPv determination in order to be able to dissolve any sample independently of its history (new, dried, or aged). This work shows that a cold delignification enables the full dissolution of samples known to be reluctant to it. The cold delignification is compared to other strategies known to ease the dissolution as a mechanical pretreatment, increasing the time of dispersion in water or of dissolution in the solvent. The comparison is conducted on new cellulosic pulp samples. A cold delignification enables the full dissolution of the sample after only 30 minutes of dissolution in the solvent and induces a DPv loss of 2.3%. On the other hand, extending the dissolution time in the solvent from 30 minutes to 4h leads to a DPv loss of 13%.

中文翻译：

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在确定 IEC 60450 纤维素绝缘材料的粘度聚合度之前冷脱木素的影响

这项工作的目的是提出一种样品制备程序，该程序对 IEC 60450 DPv 测定实施初步冷脱木素 (CD)，以便能够独立于其历史（新的、干燥的或老化的）溶解任何样品。这项工作表明，冷脱木素可以使已知不情愿的样品完全溶解。冷脱木素与其他已知的作为机械预处理容易溶解的策略相比，增加了在水中的分散时间或在溶剂中的溶解时间。比较是在新的纤维素纸浆样品上进行的。冷脱木素可使样品在溶剂中溶解仅 30 分钟后完全溶解，并导致 DPv 损失 2.3%。另一方面，