We report synthesis and characterization of a set of thermoset polyurethane (PU) bionanocomposites based on a polyol blend of poly(ε-caprolactone)/ polyethylene glycol (PCL/PEG) ABA block copolymers and their homopolymers (M_w: 2000 D). ABA block copolymers of PCL/PEG, with variable block lengths, were blended with their homopolymers. The relative weight content of Homo: Block (HB) was set 1:1 and the blend was used to synthesize a PU bionanocomposite using HDI and cellulose nanowhisker (CNW). The change in PEG and PCL block lengths resulted in an extensive change in the crystallization of the soft domains. The results of dynamic and thermal analysis revealed an increasing trend in the crystallization of the PCL/PEG segments as their lengths increase in the block copolymer structure. The shape memory analysis of the PU specimens showed high recovery (84-100%) and fixity (93-100%) ratios. Specimens with about one-order of magnitude fall in the storage modulus in the plateau region showed the highest fixity ratios. The relatively stable storage modulus at the elevated temperature indicate lack of flow for the PU nanocomposites and their thermoset nature. The cytotoxity analysis of the specimens showed a great cytocompatibility, indicating their great potential in the field of tissue engineering as a new biomaterial model. HB6 was selected as the optimum sample with SR and SF of 100%, with the highest cell viability.

我们报告的一组热固性聚氨酯（PU）的合成和表征bionanocomposites基于聚（ε -己内酯）/聚乙二醇（PCL / PEG）ABA嵌段共聚物和它们的均聚物的多元醇共混物（M_瓦特：2000 D）。将具有可变嵌段长度的PCL / PEG的ABA嵌段共聚物与它们的均聚物共混。Homo：Block（HB）的相对重量含量设置为1：1，并使用HDI和纤维素纳米晶须（CNW）将共混物用于合成PU纳米复合材料。PEG和PCL嵌段长度的变化导致软结构域结晶的广泛变化。动态和热分析的结果表明，随着PCL / PEG链段的长度在嵌段共聚物结构中增加，其结晶化趋势不断增加。PU样品的形状记忆分析显示出高的回收率（84-100％）和固定率（93-100％）。高原地区的储能模量下降约一个数量级的样品显示出最高的固定率。高温下相对稳定的储能模量表明PU纳米复合材料缺乏流动性及其热固性。标本的细胞毒性分析显示出极大的细胞相容性，表明它们作为新的生物材料模型在组织工程领域具有巨大潜力。HB6被选为SR和SF为100％，细胞活力最高的最佳样品。