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相关概念视频

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
Determination of Molar Masses of Polymers I01:24

Determination of Molar Masses of Polymers I

Polymerization produces macromolecules with a range of chain lengths due to the random nature of molecular growth processes. As chains form and terminate at different stages, a single polymer sample contains molecules of varying sizes rather than a uniform structure. This variability is described using average molar masses and distribution-related parameters, which together provide a comprehensive understanding of polymer characteristics.The distribution of molar masses plays a critical role in...
Determination of Molar Masses of Polymers II01:27

Determination of Molar Masses of Polymers II

Polymer samples typically consist of macromolecular chains with a distribution of lengths, resulting in a range of molar masses rather than a single discrete value. Conventional descriptors such as the number-average molar mass and weight-average molar mass quantify this distribution but do not fully capture polymer behavior in solution..The viscosity-average molar mass provides a more realistic description of polymer behavior in solution because it accounts for the enhanced contribution of...

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化学测量方法用于多糖粘度分析.

Oksana Mykhalevych1, Henrik Stapelfeldt2, Rasmus Bro3

  • 1CP Kelco ApS, 4623 Lille Skensved, Denmark; Department of Food Science, University of Copenhagen, 1958 Frederiksberg, Denmark.

Carbohydrate polymers
|November 19, 2024
PubMed
概括

使用大小排除色谱 (SEC) 与多角度光散射 (MALS) 和粘度计的新方法提供了一种更快,更绿色的方法来测量红素粘度. 这种方法有助于更好地理解卡拉基南是如何作用的.

关键词:
胡卜素是因为胡卜素.化学测量 化学测量 化学测量这就是PLS PLS.美国证券交易所 (SEC) -马尔斯-维斯科粘度 粘度 粘度 粘度 粘度

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科学领域:

  • 食品科学与技术 食品科学与技术
  • 聚合物科学 聚合物科学
  • 分析化学 分析化学

背景情况:

  • 传统的卡拉基南粘度测量是耗时的,缺乏详细的结构性质洞察力.
  • 对于工业应用来说,开发高效和环保的卡拉基南分析方法至关重要.

研究的目的:

  • 开发和验证一个集成的尺寸排除色谱与多角度光散射 (SEC-MALS) 和粘度测量方法来确定卡拉基南表面粘度.
  • 建立可预测的化学测量模型,将分子参数与卡拉基南粘度相关联.
  • 为了提高对卡拉基南应用和制造的结构性质理解.

主要方法:

  • 通过SEC-MALS和在线粘度测量,分析了来自四种海藻的卡拉基南样本.
  • 部分最小平方 (PLS) 回归被用来构建预测化学测量模型.
  • 关键的分子参数 (水力动力半径,内在粘度,分子质量) 与粘度相关.

主要成果:

  • 集成的SEC-MALS-粘度测量方法为粘度的确定提供了更有效和更环保的方法.
  • PLS模型成功地确定了影响卡拉基粘度的显著分子参数.
  • 预测错误因海藻来源而异,而Eucheuma denticulatum显示出最小的错误 (RMSEP 8.4).
  • 结合根的平方半径平均值,改善了Gigartina属 carrageenan的模型准确性.

结论:

  • 集成的SEC-MALS与PLS回归是一种可靠的分析方法,用于评估卡拉基南粘度.
  • 这种方法提高了结构属性理解,有助于质量控制和产品开发.
  • 该方法比传统的粘度测量技术有显著的改进.