Synthesis and characterization of polyethylene glycol-phenol-formaldehyde based polyurethane composite.,Scientific Reports

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Synthesis and characterization of polyethylene glycol-phenol-formaldehyde based polyurethane composite.
Scientific Reports ( IF 3.8 ) Pub Date : 2019-12-20 , DOI: 10.1038/s41598-019-56147-x
Juan Liu ₁ , RiQing Chen _{2,

3} , ChunPeng Wang _{2,

3} , YongJun Zhao ₁ , FuXiang Chu _{3,

4}

Affiliation

A series of phenol-formaldehyde-polyethylene glycol polyether polyols (PF-PEGs) were synthesized through the condensation polymerization and etherification of phenol, formaldehyde, and poly(ethylene glycol) (PEG) under alkaline conditions and subsequently reacted with 1,6-hexamethylene diisocyanate to obtain polyurethane (PU) films using acetone as solvents. The influence of phenol and formaldehyde to PEG mass ratio ((P + F)/PEG) on the hydroxyl number of PF-PEGs and mechanical properties, thermal stabilities, crystallization behaviors, as well as microstructure of polyurethane composite films were studied using chemical analysis, mechanical tests, thermogravimetric analyses (TGA), dynamic mechanical analyses (DMA), X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM), respectively. Results demonstrated that PF-PEGs with (P + F)/PEG of 50/50 had the highest hydroxyl number of 323 mg K(OH)/g. The incorporation of phenol and formaldehyde into PEG improved the mechanical properties of polyurethane films, glass transition temperature (Tg), and thermal properties but resulted in the brittleness characteristic of the composite films and low crystallization properties. Moreover, the synthesis mechanism of PF-PEGs polyurethane composite films was revealed, which would provide a theoretical base for the preparation of the rigid polyurethane foams based on phenolic resins.

中文翻译：

聚乙二醇-苯酚-甲醛基聚氨酯复合材料的合成与表征。

通过在碱性条件下苯酚，甲醛和聚乙二醇（PEG）的缩聚和醚化反应，合成了一系列苯酚-甲醛-聚乙二醇聚醚多元醇（PF-PEG），然后与1,6-六亚甲基反应使用丙酮作为溶剂，用二异氰酸酯制得聚氨酯（PU）薄膜。用化学分析方法研究了苯酚和甲醛对PEG质量比（（P + F）/ PEG）对PF-PEG的羟值和力学性能，热稳定性，结晶行为以及微观结构的影响。，机械测试，热重分析（TGA），动态力学分析（DMA），X射线衍射（XRD），扫描和透射电子显微镜（SEM和TEM）。结果表明，（P + F）/ PEG为50/50的PF-PEG的最高羟基值为323 mg K（OH）/ g。将苯酚和甲醛掺入PEG可以改善聚氨酯膜的机械性能，玻璃化转变温度（Tg）和热性能，但会导致复合膜的脆性和低结晶性。此外，揭示了PF-PEGs聚氨酯复合膜的合成机理，这将为制备基于酚醛树脂的硬质聚氨酯泡沫塑料提供理论依据。和热性能，但导致复合膜的脆性和低结晶性。此外，揭示了PF-PEGs聚氨酯复合膜的合成机理，这将为制备基于酚醛树脂的硬质聚氨酯泡沫塑料提供理论依据。和热性能，但导致复合膜的脆性和低结晶性。此外，揭示了PF-PEGs聚氨酯复合膜的合成机理，这将为制备基于酚醛树脂的硬质聚氨酯泡沫塑料提供理论依据。

更新日期：2019-12-20

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