Tuning crystallization of thin coatings on paper: Impact of cellulose stearoyl ester on wax co-crystallization

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-09-23 DOI:10.1016/j.porgcoat.2025.109682

Carina Breuer , Hergen Breitzke , Olaf Soltwedel , Alex Hairapetow , Linus Sprandl , Andreas Geissler , Gerd Buntkowsky , Regine von Klitzing , Markus Biesalski

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Abstract

Paper-based packaging represents a viable alternative for reducing plastic usage. To tailor material performance, wax coatings with distinct crystallization behaviors are employed. One coating system of particular interest is a blend of low-molecular-weight ethylene glycol distearate (EGDS) and fully substituted cellulose stearoyl ester (CSE). Upon cooling from the melt under ambient conditions, this blend forms superficial crystalline structures on the micrometer scale, enabling its function as a regenerable, superhydrophobic paper coating. This study investigates the co-crystallization behavior of EGDS and CSE, focusing on the spontaneous out-of-plane growth of crystallites without significant energy input. Initially, the crystallization of pure EGDS was characterized. Subsequently, the interaction of EGDS wax with biobased CSE polymer was examined in detail using calorimetric analysis, scattering techniques, and NMR spectroscopy, respectively. The influence of the side chain length of the cellulose ester, and its impact on chemical compatibility with EGDS, was also considered. The system exhibits phase mediation through the insertion of polymeric aliphatic side chains into the EGDS structure and the formation of CSE side-chain crystallites, which serve as nucleation sites for subsequent EGDS crystallization. This allows the controlled tuning of crystalline morphology and thus broaden its applicability in sustainable material development for advanced applications.

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纸张上薄涂层的调谐结晶：纤维素硬脂酰酯对蜡共结晶的影响

纸质包装是减少塑料使用的可行选择。为了调整材料性能，采用具有不同结晶行为的蜡涂层。一种特别令人感兴趣的涂层系统是低分子量乙二醇二硬脂酸酯（EGDS）和完全取代的纤维素硬脂酰酯（CSE）的混合物。在环境条件下，熔体冷却后，这种混合物形成微米尺度的表面晶体结构，使其成为可再生的超疏水纸涂层。本研究研究了EGDS和CSE的共晶行为，重点研究了在没有大量能量输入的情况下晶体的自发面外生长。首先对纯EGDS的结晶进行了表征。随后，分别使用量热分析、散射技术和核磁共振波谱技术详细研究了EGDS蜡与生物基CSE聚合物的相互作用。研究了纤维素酯侧链长度对其与EGDS化学相容性的影响。通过在EGDS结构中插入聚合脂肪侧链和形成CSE侧链晶体，该体系表现出相中介作用，这些侧链晶体作为后续EGDS结晶的成核位点。这使得晶体形态的控制调谐，从而扩大其在可持续材料开发的先进应用的适用性。

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.