Fakultät für Ingenieurwissenschaften, ‡Makromolekulare Chemie II, Universität Bayreuth , 95440 Bayreuth, Germany.
ACS Nano. 2014 Oct 28;8(10):10048-56. doi: 10.1021/nn502662p. Epub 2014 Sep 22.
Several hundred grams of Janus nanoparticles (d ≈ 40 nm) were synthesized from triblock terpolymers as compatibilizers for blending of technologically relevant polymers, PPE and SAN, on industry-scale extruders. The Janus nanoparticles (JPs) demonstrate superior compatibilization capabilities compared to the corresponding triblock terpolymer, attributed to the combined intrinsic properties, amphiphilicity and the Pickering effect. Straightforward mixing and extrusion protocols yield multiscale blend morphologies with "raspberry-like" structures of JPs-covered PPE phases in a SAN matrix. The JPs densely pack at the blend interface providing the necessary steric repulsion to suppress droplet coagulation during processing. We determine the efficiency of JP-compatibilization by droplet size evaluation and find the smallest average droplet size of d ≈ 300 nm at 10 wt % of added compatibilizer, whereas at 2 wt %, use of JPs is most economic with reasonable small droplets and narrow dispersity. In case of excess JPs, rheological properties of the system is changed by a droplet network formation. The large-scale synthesis of JPs, the low required weight fractions and their exceptional stability against extensive shear and temperature profiles during industrial extrusion process make JP promising next generation compatibilizers.
数百克的 Janus 纳米粒子（d ≈ 40nm）是由嵌段三共聚物合成的，用作技术相关聚合物 PPE 和 SAN 共混的增容剂，在工业规模的挤出机上进行。与相应的嵌段三共聚物相比，Janus 纳米粒子（JPs）表现出优异的增容能力，这归因于其内在特性、两亲性和 Pickering 效应的结合。简单的混合和挤出方案可在 SAN 基体中生成具有“覆盆子状”结构的 JPs 覆盖的 PPE 相的多尺度共混形态。JPs 在共混物界面上密集堆积，提供必要的空间排斥力以抑制加工过程中的液滴聚结。我们通过液滴尺寸评估来确定 JP 增容的效率，在添加 10wt%增容剂时，发现最小的平均液滴尺寸为 d ≈ 300nm，而在 2wt%时，使用 JPs 是最经济的，具有合理的小液滴和较窄的分散性。在 JP 过量的情况下，体系的流变性能会因液滴网络的形成而发生变化。JPs 的大规模合成、所需的低重量分数以及其在工业挤出过程中对广泛的剪切和温度曲线的异常稳定性，使得 JP 有望成为下一代增容剂。
