The styrene and vinyl neodecanoate copolymerization system shows a strong tendency to form two separate homopolymers. In order to improve the feeding strategies and hence the copolymer uniformity, it is necessary to know the reactivity ratios between these monomers. The error‐in‐variables‐method (EVM) is the most recommended mathematical procedure for estimating these parameters. Experiments on free‐radical copolymerization in solution in sealed ampoules are carried out to provide data for the conversion (via gravimetry) and fractional monomer compositions (via Fourier transform mid‐infrared (mid‐FT‐IR) spectroscopy). These data allow estimation of the reactivity ratios. EVM appropriately takes into account the experimental errors in the data and allows determination of the reactivity ratio values by the Mayo–Lewis model (r₁ = 28.60 and r₂ = 1.23). The convergence and robustness of the method decrease considerably with a larger discrepancy between the reactivity values.

中文翻译：

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苯乙烯和VeoVa-10共聚反应率的估算

苯乙烯和新癸酸乙烯酯共聚体系显示出形成两种单独的均聚物的强烈趋势。为了改善进料策略并因此改善共聚物均匀性，必须知道这些单体之间的反应率。变量错误法（EVM）是估算这些参数的最推荐的数学程序。进行了密封安瓿溶液中自由基共聚的实验，以提供转化数据（通过重量分析）和分数单体组成（通过傅立叶变换中红外光谱（FT-IR））。这些数据允许估计反应率。EVM适当考虑了数据中的实验误差，并允许通过Mayo-Lewis模型确定反应率值（r ₁ = 28.60和r ₂ = 1.23）。随着反应性值之间的较大差异，该方法的收敛性和鲁棒性大大降低。