纤维素纳米晶通过鱼网微结构协同增强聚氨酯复合材料：遮光和机械性能,Journal of Applied Polymer Science

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纤维素纳米晶通过鱼网微结构协同增强聚氨酯复合材料：遮光和机械性能
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-11-08 , DOI: 10.1002/app.54889
Peng Zhang _{1,

2} , Bin‐bin Wang ₁ , Zhu Zhang ₁ , Dan‐ni Yang ₁

Affiliation

掺入纤维素纳米晶（CNC）的协同增强聚氨酯（PU）复合材料进行原位聚合，然后通过调整扩链剂和添加不同低含量的CNC，实现PU/CNC复合材料日益紧密的网格网络结构，由于不同硬段的引入或球晶的演化。结果，PU弹性体和CNC填充复合材料的透光开始表现出从紫外光到可见光区域的明显红移，这意味着所有紫外光区域都可以被完全屏蔽。因此，与未保护的水溶液中的罗丹明B相比，PU-PDA、PU-BDI或PU-PDA/CNC薄膜保护的水溶液中的罗丹明B在紫外光下的低效光降解进一步验证了其优异的紫外光屏蔽性能。辐照。同时，通过添加 CNC 填料，观察到 PU-PDA 复合材料的光屏蔽性能增强。此外，机械性能显着提高，弹性模量、拉伸强度和断裂伸长率提高了两倍或三倍以上。最后，发现了 PU 复合材料机械性能的协同增强。因此，该研究对于潜在的光应用具有重要意义。

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Cellulose nanocrystal synergistically enhanced polyurethane composites via fish-net microstructure: Light shielding and mechanical properties

The synergistically enhanced polyurethane (PU) composites, in which the cellulose nanocrystal (CNC) was incorporated, were in situ polymerized and then the increasingly closer grid network structures for PU/CNC composites were achieved by adjusting chain extenders and adding different low contents of CNC, due to the introduction of different hard segments or the evolution of spherulites. As a result, the onset of the light transmission of PU elastomers and CNC-filled composites showed an obvious red shift from UV light to visible light region, which meant that all UV light regions could be shielded entirely. Therefore, compared with Rhodamine B in water solution unprotected, the excellent UV-light shielding was further verified by the inefficient photodegradation of Rhodamine B in water solution protected by PU-PDA, PU-BDI or PU-PDA/CNC films under UV-light irradiation. Meanwhile, enhanced light shielding behavior for PU-PDA composites was observed with adding the CNC fillers. Moreover, the significantly enhanced mechanical properties were achieved, more than two or three times at elastic modulus, tensile strength and elongation at break. Finally, synergistically Enhanced mechanical properties in PU composites were found. Therefore, the study was of great significance in the potential light application.

更新日期：2023-11-08

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