Pérez-Martínez Bertha T, Farías-Cepeda Lorena, Ovando-Medina Víctor M, Asua José M, Rosales-Marines Lucero, Tomovska Radmila
POLYMAT and Departamento de Química Aplicada, Facultad de Ciencias Químicas, University of the Basque Country UPV/EHU, Joxe Mari Korta zentroa, Tolosa Etorbidea 72, Donostia-San Sebastián 20018, Spain.
Departamento de Ingeniería Química, Universidad Autónoma de Coahuila, Blvd. V. Carranza e Ing. José Cárdenas V. S/N, Saltillo, Coah, 25280 México.
Beilstein J Nanotechnol. 2017 Jun 27;8:1328-1337. doi: 10.3762/bjnano.8.134. eCollection 2017.
Film forming, stable hybrid latexes made of methyl metacrylate (MMA), butyl acrylate (BA) and 2-hydroxyethyl methacrylate (HEMA) copolymer reinforced with modified multiwalled carbon nanotubes (MWCNTs) were synthesized by in situ miniemulsion polymerization. The MWCNTs were pretreated by an air sonication process and stabilized by polyvinylpyrrolidone. The presence of the MWCNTs had no significant effect on the polymerization kinetics, but strongly affected the polymer characteristics ( and insoluble polymer fraction). The performance of the in situ composites was compared with that of the neat polymer dispersion as well as with those of the polymer/MWCNT physical blends. The in situ composites showed the presence of an additional phase likely due to the strong interaction between the polymer and MWNCTs (including grafting) that reduced the mobility of the polymer chains. As a result, a substantial increase of both the storage and the loss moduli was achieved. At 60 °C, which is above the main transition region of the polymer, the in situ composites maintained the reinforcement, whereas the blends behaved as a liquid-like material. This suggests the formation of a 3D network, in good agreement with the high content of insoluble polymer in the in situ composites.
通过原位微乳液聚合合成了由甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）和甲基丙烯酸2-羟乙酯（HEMA）共聚物制成的、用改性多壁碳纳米管（MWCNTs）增强的成膜稳定杂化乳胶。MWCNTs通过空气超声处理进行预处理，并用聚乙烯吡咯烷酮进行稳定化处理。MWCNTs的存在对聚合动力学没有显著影响，但对聚合物特性（和不溶性聚合物部分）有强烈影响。将原位复合材料的性能与纯聚合物分散体以及聚合物/MWCNT物理共混物的性能进行了比较。原位复合材料显示存在一个额外的相，这可能是由于聚合物与MWNCTs之间的强相互作用（包括接枝）降低了聚合物链的流动性。结果，储能模量和损耗模量都大幅增加。在60°C（高于聚合物的主要转变区域）时，原位复合材料保持了增强效果，而共混物表现为类似液体的材料。这表明形成了三维网络，这与原位复合材料中高含量的不溶性聚合物非常吻合。
