Abstract

In the research described here polyvinyl butyral (PVB) samples with mass acetalization degrees of 84.4%, 70.4%, 58.8%, 40.3% and number-average molecular weights (M_n) of 29300 ∼ 36100 g mol⁻¹ were synthesized using p-toluenesulfonic acid as a catalyst. The PVB samples were characterized by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and differential thermogravimetric analysis (DTGA). Furthermore, the solubility parameters of the PVB with different acetalization degrees were determined by the Hansen Solubility Parameter in Practice (HSPiP) software, turbidimetric titration and group contribution methods. The results showed that the total solubility parameter (δ_t) and two of the solubility parameter components (polar solubility parameter δ_p and hydrogen bonding solubility parameter δ_h) increased linearly with the decrease of the acetalization degree of the PVB, while the change of δ_d (dispersion solubility parameter) was not obvious. The correlation between the solubility parameters and acetalization degree of PVB was established. The solubility parameters obtained in this paper can be used to predict the affinity of PVB with solvents or additives, which is convenient for solvent selection and formulation design.

摘要

在此处描述的研究中，聚乙烯醇缩丁醛 (PVB) 样品的质量缩醛化度为 84.4%、70.4%、58.8%、40.3%，数均分子量 ( Mn )_为29300 ∼ 36100 g mol ^-1以对甲苯磺酸为催化剂合成。PVB样品通过凝胶渗透色谱（GPC）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、差示扫描量热法（DSC）、热重分析（TGA）和差示热重分析（DTGA）进行表征。此外，通过Hansen Solubility Parameter in Practice（HSPiP）软件、比浊滴定法和基团贡献法测定了不同缩醛化度PVB的溶解度参数。结果表明，总溶解度参数（_δt ）和两个溶解度参数分量（极性溶解度参数_δp和氢键溶解度参数_δh)随着PVB缩醛化程度的降低而线性增加，而δd（分散溶解度参数）的变化_不明显。建立了溶解度参数与PVB缩醛化程度的相关性。本文得到的溶解度参数可用于预测PVB与溶剂或添加剂的亲和性，便于溶剂选择和配方设计。