Abstract Renewable castor oil (CO) was investigated as a polyol for preparation of polyurethane-based pressure sensitive adhesives (PSAs). PSAs from the one-pot reaction of CO, poly(propylene glycol) (PPG), toluene diisocyanate (TDI) and DBTDL have all desirable properties for applications as surface protective films. NCO-terminated PPG-TDI adducts were prepared from reactions of PPG and TDI at room temperature (as designated as PPG-TDIR) and 100 °C (as designated as PPG-TDI100), respectively. The PSAs from reactions of CO and PPG-TDIR or PPG-TDI100 had higher peel strengths than those from reactions of CO and the mixture of PPG and TDI. PPG-TDIR resulted in a higher peel strength of the resulting PSAs than PPG-TDI100. A two-stage curing process of the partial curing of the mixture of CO and PPG-TDIR at 125 °C and the final curing in an ambient environment was better than one-stage complete curing at 125 °C in terms of enhancing the peel strength of the resulting PSAs. The NCO/OH molar ratio of 0.85 in the mixture of CO and PPG-TDIR resulted in the highest peel strength for the PSAs from CO and PPG-TDIR. The PSAs from CO and PPG-TDIR had good aging resistance and can be tailored for various applications such as labels and tapes. PPG was superior to poly(ethylene glycol) (PEG) in terms of enhancing the peel strength of the resulting PSAs. The curing mechanisms are discussed in detail.

中文翻译：

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以蓖麻油为多元醇的聚氨酯基压敏胶粘剂的研究

摘要 研究了可再生蓖麻油 (CO) 作为用于制备聚氨酯基压敏粘合剂 (PSA) 的多元醇。来自 CO、聚丙二醇 (PPG)、甲苯二异氰酸酯 (TDI) 和 DBTDL 的一锅反应的 PSA 具有作为表面保护膜应用的所有理想特性。NCO 封端的 PPG-TDI 加合物分别由 PPG 和 TDI 在室温（指定为 PPG-TDIR）和 100°C（指定为 PPG-TDI100）下反应制备。CO与PPG-TDIR或PPG-TDI100反应所得PSA的剥离强度高于CO与PPG与TDI混合物反应所得PSA的剥离强度。PPG-TDIR 导致所得 PSA 的剥离强度高于 PPG-TDI100。CO和PPG-TDIR的混合物在125°C下部分固化和在周围环境中最终固化的两阶段固化工艺在提高剥离强度方面优于125°C的一步完全固化由此产生的 PSA。在 CO 和 PPG-TDIR 的混合物中 NCO/OH 摩尔比为 0.85 导致从 CO 和 PPG-TDIR 的 PSA 剥离强度最高。来自 CO 和 PPG-TDIR 的 PSA 具有良好的抗老化性，可以针对各种应用进行定制，例如标签和胶带。PPG 在增强所得 PSA 的剥离强度方面优于聚（乙二醇）（PEG）。详细讨论了固化机制。85 在 CO 和 PPG-TDIR 的混合物中导致来自 CO 和 PPG-TDIR 的 PSA 的最高剥离强度。来自 CO 和 PPG-TDIR 的 PSA 具有良好的抗老化性，可以针对各种应用进行定制，例如标签和胶带。PPG 在增强所得 PSA 的剥离强度方面优于聚（乙二醇）（PEG）。详细讨论了固化机制。85 在 CO 和 PPG-TDIR 的混合物中导致来自 CO 和 PPG-TDIR 的 PSA 的最高剥离强度。来自 CO 和 PPG-TDIR 的 PSA 具有良好的抗老化性，可以针对各种应用进行定制，例如标签和胶带。PPG 在增强所得 PSA 的剥离强度方面优于聚（乙二醇）（PEG）。详细讨论了固化机制。