An unprecedented jump in the viscosity of high-generation carbosilane dendrimer melts. (20th June 2018)

• Record Type: Journal Article
• Authors: Vasil'ev, Viktor G.; Kramarenko, Elena Yu.; Tatarinova, Elena A.; Milenin, Sergey A.; Kalinina, Alexandra A.; Papkov, Vladimir S.; Muzafarov, Aziz M.
• Is Part Of: Polymer. Volume 146(2018)
• Page Start: 1
• Page End: 5
• Publication Date: 2018-06-20
• Subjects: Carbosilane dendrimers -- Dendrimer melts -- Viscosity -- Rheology; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2018.05.016
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Rheological melt behavior of carbosilane dendrimers from the 3rd up to the 8th generation has been studied experimentally under steady shear, creep and dynamic oscillatory shear. Six orders of magnitude jump in viscosity was found between the 5th and the 6th generations. While the low-generation dendrimer melts demonstrate Newtonian behavior in a wide temperature range of 20÷80 °C, starting from the 6 t h generation, the dendrimer melts lose their ability to freely flow and acquire properties of a material with a well-pronounced yield stress. The storage modulus of high-generation dendrimer melts by far exceeds the loss modulus, furthermore, its value increases with temperature. It is demonstrated that the high-generation carbosilane dendrimers in bulk can be considered a polymer material with unique properties and as that, could find new applications in high-tech areas, in particular, as matrices for sensors. Graphical abstract: Image 1 Highlights: Rheological melt behavior of carbosilane dendrimers up to the 8 t h generation is studied. Six orders of magnitude jump in viscosity is found between the 5th and 6th generations. Solid-like behavior of high-generation dendrimer melts is established.