Mechanical Properties and Blocking Resistance of Films Cast from Core–Shell Latex Particles

IF 1.8 4区 工程技术 Q3 ENGINEERING, CHEMICAL Macromolecular Reaction Engineering Pub Date : 2023-04-15 DOI:10.1002/mren.202300021
Adrián Perez, Emily Kynaston, Christopher Lindsay, Nicholas Ballard
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Abstract

The mechanical properties and blocking resistance of films cast from latex particles can be improved by addition of a reinforcing polymer of high modulus that acts as a “hard” phase. This work demonstrates that blocking resistance, a key performance parameter for use in coatings, of such films can be understood in terms of the relative contribution of the “hard” and “soft” components to the rheological properties of the material. In order to do so, representative latexes that contain a semicrystalline core of poly(stearyl acrylate) as a reinforcing phase and a shell of amorphous poly(styrene-co-butyl acrylate) are synthesized. By varying the composition of the amorphous phase (glass transition temperature, molar mass) and the relative amorphous/semicrystalline fraction, it is demonstrated that the improvement in blocking resistance is strongly correlated with the increase in the modulus of the material but is also affected by the dynamics of polymer diffusion of chains in the soft phase. This work allows to establish design rules for polymer and colloidal structures that can be targeted to maximize blocking resistance.

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核壳乳胶颗粒铸造薄膜的机械性能和抗堵塞性能
通过添加高模量的增强聚合物作为“硬”相,可以改善由乳胶颗粒铸造的薄膜的机械性能和抗堵塞性。这项工作表明,阻塞阻力是用于涂层的关键性能参数,这种薄膜可以通过“硬”和“软”组分对材料流变特性的相对贡献来理解。为了做到这一点,合成了具有代表性的乳液,其中包含半结晶核心的聚(硬脂酰丙烯酸酯)作为增强相和非晶壳的聚(苯乙烯-丙烯酸共丁酯)。通过改变非晶态相的组成(玻璃化温度、摩尔质量)和相对非晶态/半晶分数,证明了阻滞电阻的提高与材料模量的增加密切相关,但也受到聚合物链在软相中的扩散动力学的影响。这项工作允许建立聚合物和胶体结构的设计规则,可以有针对性地最大化阻塞阻力。
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来源期刊
Macromolecular Reaction Engineering
Macromolecular Reaction Engineering 工程技术-高分子科学
CiteScore
2.60
自引率
20.00%
发文量
55
审稿时长
3 months
期刊介绍: Macromolecular Reaction Engineering is the established high-quality journal dedicated exclusively to academic and industrial research in the field of polymer reaction engineering.
期刊最新文献
Front Cover: Macromol. React. Eng. 6/2024 Masthead: Macromol. React. Eng. 6/2024 Front Cover: Macromol. React. Eng. 5/2024 Masthead: Macromol. React. Eng. 5/2024 Poly(butylene succinate) Microparticles Prepared Through Green Suspension Polycondensations
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