Abstract PVAc-based inverted core/shell (ICS) structured latex adhesive with improved water- and heat-resistance was prepared by a copolymerizing-grafting sequential reaction approach. The sequential reaction process combines the function of a copolymer layer and an active grafting site to controllably achieve the thermodynamic non-equilibrium ICS morphology with hydrophilic poly(vinyl acetate) (PVAc) cores and hydrophobic polystyrene (PS) shells. The difference between the sequential reaction approach and the chemical grafting method was explored. Structured latex particle morphology, transferring from strawberry-like particles, over particles with large and irregular PS protuberances, to nearly spherical particles with a smooth surface, was microscopically visualized by changing the amount of butyl acrylate (BA) in the PVAc copolymer cores. The heat- and water-resistant bonding of PVAc-based adhesives on wood blocks were evaluated by shear strength at both dry and wet conditions, as well as the boiling water failure time. The results showed that a significant improvement of water- and heat-resistance, especially for boiling water resistance, was successfully obtained. This novel approach paves a way for controlled design and manufacture of high-performance emulsion adhesives through tailoring particle morphology.

中文翻译：

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基于 PVAc 的倒核/壳 (ICS) 结构粘合剂的设计和制造，以提高防水木材粘合性能：II。共聚接枝顺序反应的影响

摘要 采用共聚接枝顺序反应的方法制备了具有改进的耐水性和耐热性的PVAc基倒核壳(ICS)结构胶乳。顺序反应过程结合了共聚物层和活性接枝位点的功能，以可控地实现具有亲水性聚醋酸乙烯酯 (PVAc) 核和疏水性聚苯乙烯 (PS) 壳的热力学非平衡 ICS 形态。探讨了顺序反应方法与化学接枝方法之间的差异。通过改变 PVAc 共聚物核中丙烯酸丁酯 (BA) 的量，结构化乳胶颗粒形态从草莓状颗粒转移到具有大且不规则的 PS 突起的颗粒，转变为具有光滑表面的近乎球形的颗粒。通过干湿条件下的剪切强度以及沸水破坏时间来评估基于 PVAc 的粘合剂在木块上的耐热和防水粘合。结果表明，成功地获得了耐水性和耐热性的显着改善，特别是在耐沸水方面。这种新颖的方法通过定制颗粒形态为高性能乳液粘合剂的受控设计和制造铺平了道路。