Characterisation of Thin Composite Films from Hyperbranched Polyphenylene and Thermolabile Hyperbranched Polycarbonate

Abstract

Thin composite films made from a thermally stable hyperbranched polyphenylene and a thermolabile hyperbranched polycarbonate were prepared on silicon wafers and characterised. The end groups of the polycarbonate were varied in order to accomplish an optimised interaction between the two components and thus the formation of homogeneous blends. The composite films were annealed at 200 °C in order to decompose the hyperbranched polycarbonate which can act as a porogen. The composition of the films before and after the annealing process was investigated applying IR spectroscopy and spectroscopic ellipsometry. Analysis of the data allowed calculating the volume fractions of the two materials within the films.

Aromatic Hyperbranched Polymers: Synthesis and Application

“…Hyperbranched PPhs are promising candidates for application as insulating materials in microelectronics, where features like high thermal stability, good processability and solubility, and low moisture absorption are required. The dielectric constant value of the synthesized hb-PPh from an AB 2 monomer prepared by Voit and colleagues showed a value of 2.1 [232] at low frequencies, indicating that hb-PPh is a very promising insulating material, even without the presence of pores. The introduction of nanopores into a low dielectric matrix [324,325] can offer further advantages because a very low dielectric value might be obtained in combination with greater mechanical strength and greater thermal conductivity.…”

“…All the hb-PPhs showed good solubility in common organic solvents, including chloroform and toluene. The polymer of molar mass M w ¼ 95,800 Da and Ð of 9.5 synthesized by self-condensation of AB 2 monomer also showed filmforming ability using very slow evaporation from a chloroform solution over several weeks [232]. Scheme 22 shows the structure of hb-PPh from AB 2 monomer and of a small rolled-up film of hb-PPh.…”

“…Small rolled-up film of hb-PPh of wall thickness~0.5 mm (right). Reproduced with permission from [232] Aromatic Hyperbranched Polymers: Synthesis and Application attributed to the steric hindrance of a second thiol addition to the vinyl sulfide. This selective and efficient mono-addition reaction was applied for the preparation of hb poly(vinyl sulfide)s (hb-PVSs) via the A 2 + B 3 approach starting from 1,3,5-tris (phenylethynyl)benzene B 3 monomer and hexane-1,6-dithiol as A 2 monomer (as shown in Scheme 24).…”

Synthesis of hyperbranched polycarbonate by novel polymerization of di-tert-butyl tricarbonate with 1,1,1-tris(4-hydroxyphenyl)ethane

“…[11][12][13] Hyperbranched polycarbonates (HBPCs) have been reported, [14][15][16][17][18] but until now, only a few papers describing HBPCs derived from phenolic structures have been reported. 19,20 Hyperbranched aryl PC from AB 2 or A 2 B condensation has been reported by Wooly et al 20 Compared with AB 2 or A 2 B approaches, monomers used for A 2 +B 3 polymerization are easily prepared or purchased in cases in which the polymer structure can be controlled using different monomer structures.…”

Functionalization of solid surfaces with hyperbranched polyesters to control protein adsorption

“…Due to their specific properties, as low solution viscosity and high solubility, caused by the highly branched globular structure they are considered for various applications. This is demonstrated by a variety of publications on the use of HBPs in water treatment [8], microelectronics [9,10], medical chemistry [11,12] and in coating technology [13][14][15][16][17]. In thin film applications the large amount of functional groups in HBPs is available for the interaction with "analyte" molecules (e.g.…”