Dynamically vulcanized polylactide/nitrile butadiene rubber blends with continuous cross-linked rubber phase
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Thermoplastic vulcanizates (TPVs) based on polylactide (PLA)/nitrile butadiene rubber (NBR) blends were prepared by dynamic vulcanization and the PLA matrix was plasticized by dioctyl phthalate (DOP). The surface morphologies of the etched PLA/DOP/NBR TPVs were studied by field emission scanning electron microscope, and the element contents in the TPV surface were characterized by energy dispersive X-Ray spectroscopy; moreover, the dissolution/swell behaviors, infrared spectra and rheological behavior of the prepared PLA/DOP/NBR TPV were also characterized. Experimental results indicated that the cross-linked NBR in the PLA/DOP/NBR TPVs owned a continuous network-like structure due to the much difference in the viscosity between the NBR rubber and the PLA resin. This unique finding breaks the traditional concept of a sea-island morphology which was formed after dynamic vulcanization of the thermoplastic resin/rubber blends. PLA grafted onto NBR under the action of DCP vulcanizing agent, leading to the improving interface compatibility. It should be noted that this PLA/DOP/NBR TPV with the novel microstructure has never been reported.
KeywordsDynamic vulcanization Polylactide Nitrile butadiene rubber Co-continuous Morphology
The work was supported by Shandong Provincial Natural Science Foundation, China (ZR2017MEM021;ZR2016EMM03) and Upgraded Project of Shandong Province for Guidance Ability of Graduate Tutors (SDYY17044).
Compliance with ethical standards
This manuscript has not been published elsewhere and it has not been submitted simultaneously for publication elsewhere.
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