Bonilla-Cruz José, Hernández-Mireles Brenda, Mendoza-Carrizales Ricardo, Ramírez-Leal Luis A, Torres-Lubián Román, RamosdeValle Luis F, Paul Donald R, Saldívar-Guerra Enrique
Centro de Investigación en Química Aplicada (CIQA), Blvd. Enrique Reyna 140, Saltillo 25294, Mexico.
Advanced Functional Materials & Nanotechnology Group, Centro de Investigación en Materiales Avanzados (CIMAV-Unidad Monterrey), Av. Alianza Norte 202, Autopista Monterrey-Aeropuerto Km 10, PIIT, Apodaca 66628, Mexico.
Polymers (Basel). 2017 Feb 20;9(2):63. doi: 10.3390/polym9020063.
Butyl rubber (isobutylene⁻isoprene⁻rubber, IIR) was functionalized in solution with a nitroxide moiety taking advantage of the unsaturations present in the isoprene units of IIR, and was further grafted with maleic anhydride (MA) or styrene⁻MA (SMA) to produce IIR--MA and IIR--SMA. In one of the functionalization techniques used, the molecular structure of the IIR was preserved as the chain-breaking reactions are prevented from occurring. The resulting graft copolymers were tested as compatiblizers/impact modifiers blended with Nylon-6, and one of them was preliminarily tested as a coupling agent in the preparation of nanocomposites of IIR and an organo-clay. Blends of PA-6/IIR--MA exhibited a significant increase in impact resistance at increasing loads of the modified IIR, as well as a good rubber particle dispersion in the polyamide matrix. On the other hand, the performance of IIR--SMA as an impact modifier of PA, or as a coupling agent in the preparation of rubber-organoclay nanocomposites, is marginal.
利用丁基橡胶（异丁烯-异戊二烯橡胶，IIR）中异戊二烯单元的不饱和键，在溶液中用氮氧化物部分对其进行官能化，然后进一步用马来酸酐（MA）或苯乙烯-马来酸酐（SMA）接枝，制备出IIR-MA和IIR-SMA。在所采用的一种官能化技术中，由于防止了链断裂反应的发生，IIR的分子结构得以保留。将所得的接枝共聚物作为增容剂/抗冲改性剂与尼龙-6共混进行测试，其中一种还作为偶联剂用于制备IIR与有机黏土的纳米复合材料。随着改性IIR用量的增加，PA-6/IIR-MA共混物的抗冲击性显著提高，且橡胶颗粒在聚酰胺基体中分散良好。另一方面，IIR-SMA作为PA的抗冲改性剂或在制备橡胶-有机黏土纳米复合材料中作为偶联剂的性能则很一般。
