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首页> 外文期刊>Polymers for advanced technologies >Stimuli-responsive polyurethane bionanocomposites of poly(ethylene glycol)/poly(epsilon-caprolactone) and [poly(epsilon-caprolactone)-grafted-] cellulose nanocrystals
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Stimuli-responsive polyurethane bionanocomposites of poly(ethylene glycol)/poly(epsilon-caprolactone) and [poly(epsilon-caprolactone)-grafted-] cellulose nanocrystals

机译：聚（乙二醇）/聚（ε-己内酯）和[聚（ε-己内酯） - 移植剂 - ]纤维素纳米晶体的刺激 - 响应聚氨酯二酮复合材料

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摘要

In this study, in situ polyurethane (PU) bionanocomposites of poly(ethylene glycol) (PEG)/poly(epsilon-caprolactone) (PCL) polyols, bare cellulose nanocrystals (CNCs) and PCL-grafted CNCs (G-CNC) were synthesized with different contents of CNCs as cross-linking agent to control the extent of phase separation. The effect of confining the chains between CNCs through urethane linkages and presence of PCL grafts on phase and crystallization behavior was evaluated. Crystallization and chemical networking were controlled to tune the shape fixity (SF) and recovery (SR) of the specimens, resulting in a SF of 100% for linear and PU nanocomposites of G-CNC (0.5% and 1%) samples. The PU nanocomposite of G-CNC (0.5%) was selected as the optimum sample with the highest SR of 100%. The effect of surface hydrophobicity on cellular behavior of Human Foreskin Fibroblast (as a normal cell) and HepG2 (as a cancerous cell) cells was evaluated. Cell adhesion analysis of the prepared samples indicated two different behaviors possibly due to the difference in the epigenetic nature of the cells and cellular integrin- based bonds showing a great potential for a variety of tissue engineering applications.
机译：本研究以聚乙二醇（PEG）/聚己内酯（PCL）多元醇、裸纤维素纳米晶体（CNC）和PCL接枝CNC（G-CNC）为交联剂，合成了原位聚氨酯（PU）生物纳米复合材料，以控制相分离程度。评估了通过聚氨酯键限制CNC之间的链以及PCL接枝物的存在对相和结晶行为的影响。控制结晶和化学网络以调整试样的形状固定性（SF）和回收率（SR），从而使G-CNC（0.5%和1%）样品的线性和PU纳米复合材料的SF为100%。选择G-CNC（0.5%）的PU纳米复合材料作为最佳样品，最高SR为100%。评估了表面疏水性对人包皮成纤维细胞（作为正常细胞）和HepG2（作为癌细胞）细胞行为的影响。对制备的样品进行的细胞粘附分析表明，两种不同的行为可能是由于细胞的表观遗传性质不同，而基于细胞整合素的键在各种组织工程应用中显示出巨大的潜力。

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