The Impact of Janus Nanoparticles on the Compatibilization of Immiscible Polymer Blends under Technologically Relevant Conditions
The Impact of Janus Nanoparticles on the Compatibilization of Immiscible Polymer Blends under Technologically Relevant Conditions
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DOI：
10.1021/nn502662p
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发表时间：
2014-10-01
期刊：
影响因子：
17.1
通讯作者：
Altstaedt, Volker
中科院分区：
文献类型：
--
作者：
Bahrami, Ronak;Loebling, Tina I.;Altstaedt, Volker
从三嵌段三元共聚物合成数百克Janus纳米颗粒（d约40 nm），作为用于在工业规模挤出机上共混技术相关聚合物PPE和SAN的增容剂。Janus纳米粒子（JPs）与相应的三嵌段嵌段共聚物相比表现出上级的增容能力，这归因于组合的固有性质、两亲性和Pickering效应。简单的混合和挤出协议产生多尺度共混物形态与“树莓状”结构的JP覆盖的PPE相在SAN矩阵。JP在共混物界面处密集堆积，提供必要的空间排斥以抑制加工期间的液滴凝结。我们通过液滴尺寸评估确定JP增容的效率，并且发现在10重量%的添加的增容剂下d的最小平均液滴尺寸接近300 nm，而在2重量%时，使用JP是最经济的，具有合理的小液滴和窄分散性。在过量JPs的情况下，系统的流变性质通过液滴网络形成而改变。JP的大规模合成，低要求的重量分数及其在工业挤出过程中对广泛的剪切和温度曲线的优异稳定性使JP成为有前途的下一代增容剂。
Several hundred grams of Janus nanoparticles (d approximate to 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 approximate to 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.