Measurement of short chain branching in olefin copolymers using chemometric analysis
    4.
    发明授权
    Measurement of short chain branching in olefin copolymers using chemometric analysis 有权
    使用化学计量分析测量烯烃共聚物中的短链支化

    公开(公告)号:US07056744B2

    公开(公告)日:2006-06-06

    申请号:US10463849

    申请日:2003-06-16

    IPC分类号: G01N33/44 G01N21/00

    摘要: A method of determining the proportion of short-chain branching in an olefin copolymer process stream is disclosed. The short-chain branching may also be determined as a function of molecular weight in a sample having a range of molecular weights. In the method, at least two olefin copolymer training samples are provided. The respective samples have different, known proportions of short-chain branching. The infrared (e.g. FT-IR) absorbance spectra of the training samples in a wavenumber range are obtained. Calibration information is determined from the training samples by chemometrically correlating the differences in the infrared absorbance spectra of the training samples to the differences in the degree of short-chain branching in the training samples. This step generates calibration information that allows the degree of short-chain branching in a sample to be determined once its infrared absorbance spectrum is obtained. A method for determining the statistical error in the measurement of short-chain branching in an olefin polymer sample as a function of its molecular weight distribution is also disclosed.

    摘要翻译: 公开了一种确定烯烃共聚物工艺流中短链支化比例的方法。 短链支化也可以在具有分子量范围的样品中作为分子量的函数来确定。 在该方法中,提供至少两种烯烃共聚物训练样品。 各样品具有不同的已知比例的短链支化。 获得波数范围内训练样本的红外(例如FT-IR)吸收光谱。 通过化学方法将训练样本的红外吸收光谱的差异与训练样本中短链分支程度的差异化学相关,从训练样本中确定校准信息。 该步骤产生校准信息,其允许在获得样品的红链吸收光谱后测定样品中的短链支化度。 还公开了用于确定烯烃聚合物样品中短链支化的测量中的统计误差作为其分子量分布的函数的方法。