Better characterization of raw natural rubber by decreasing the rotor speed of Mooney viscometer: Role of macromolecular structure
Better characterization of raw natural rubber by decreasing the rotor speed of Mooney viscometer: Role of macromolecular structure
复制标题
DOI：
10.1002/pen.21525
复制
发表时间：
2010-02
影响因子：
3.2
通讯作者：
Chandy Kim;M. Morel;J. S. Beuve;S. Guilbert;F. Bonfils
中科院分区：
文献类型：
--
作者：
Chandy Kim;M. Morel;J. S. Beuve;S. Guilbert;F. Bonfils
本研究的目的是通过测量在≤2 rpm的可变转子速度下的门尼粘度（VR）（称为变速门尼粘度（MVS））来表征具有不同大分子结构的天然橡胶（NR）样品。用选定的特定克隆制备技术上指定的恒定门尼粘度（TSR 5CV）橡胶的模型样品。样品的结构，其特征在于与在线多角度光散射检测器（SEC-MALS）的尺寸排阻色谱。用动态动模流变仪对样品的流变性能进行了表征。用MVS测量单克隆模型样品，显示三种类型的VR流动曲线。高转子速度（2 rpm）下的VR与数均摩尔质量（Mn）相关，而低转子速度（0.05 rpm）下的VR与重均摩尔质量（Mw）相关。测量MVS揭示了样品的流变行为，并能够区分具有不同大分子结构的样品，因此有助于预测加工性能。Polym.工程索引，2009.© 2009年塑料工程师协会
The objective of our work was to characterize natural rubber (NR) samples with different macromolecular structures by measuring Mooney viscosities (VR) at variable rotor speeds ≤2 rpm, called variable speed Mooney viscosity (MVS). Model samples of technically specified rubbers of constant Mooney viscosity (TSR5CV) were prepared with chosen specific clones. The structures of the samples were characterized by size-exclusion chromatography coupled with an online multi-angle light-scattering detector (SEC-MALS). Rheological properties of the samples were also characterized by a dynamic moving die rheometer. Measuring monoclonal model samples by MVS showed three types of VR flow curves. The VR at high rotor speed (2 rpm) was correlated with number-average molar mass (Mn), whereas VR at low rotor speed (0.05 rpm) was correlated with weight-average molar mass (Mw). Measuring MVS revealed the rheological behaviors of samples and enabled discrimination between samples with different macromolecular structures and should thus help in predicting processability. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers