Blends of Amphiphilic, Hyperbranched Polyesters and Different Polyolefins

Abstract

A hyperbranched polyester based on 3,5-dihydroxybenzoic acid was completely modified with dodecanoyl chloride to result in an amphiphilic, globular polymer, which has a polar core and a nonpolar outer sphere with the ability both to incorporate an organic dye and to interact with a nonpolar matrix. A series of blends were prepared using either polypropylene or polyethylene (HDPE) as the matrix. The content of the polyester as disperse phase was varied between 0.05 and 20 wt %. The blends with polyester contents up to 5% were prepared for colorization of polyolefins using the polyester as a dye carrier. The blends with higher polyester contents were prepared in order to investigate the influence of the hyperbranched material on the material properties. The blends exhibited a heterogeneous morphology with very small particle sizes even at high polyester concentrations. The melt rheology measurements resulted in a reduced complex viscosity for both polyolefins when the hyperbranched polyester was added. The observed melt viscosity of the i-PP blends deviated from the linear mixing rule, whereas the HDPE blends followed it. The use of amphiphilic hyperbranched polyesters as dye carriers allowed a homogeneous distribution of an organic dye in a polyolefin matrix with similar dynamic-mechanical behavior of the blends compared to the case of pure polyolefins. The dyed samples exhibited good stability in extraction experiments.

Aromatic Hyperbranched Polymers: Synthesis and Application

“…Only at a high content of AB 2 hb-PE was a decrease in the complex viscosity of the blends observed. The addition of A 2 + B 3 hb-PE to PA6 resulted in a continuously increased zero-shear viscosity from 380 to 920 Pa s with increase in the content of A 2 + B 3 hb-PE from 0 to 15 wt% in the blends, which is in contrast to previous findings [49,247,254,268]. This was attributed to the existence of a heterogeneous system in which a phase with a higher viscosity (A 2 + B 3 hb-PE) was dispersed in the continuous phase (PA6) possessing a lower complex viscosity, and this was also manifested in the scanning electron microscopy (SEM) images.…”

“…Schmaljohann et al [247] used hb polyesters with alkyl-modified end groups as dye carriers in polyolefins. The use of hb polyesters resulted in a reduced melt viscosity of the polyolefin and a much better distribution of the dye in the polyolefin matrix.…”

New coating systems based on vinyl ether- and oxetane-modified hyperbranched polyesters

“…Except a small amount (1%) of triphenylphosphinoxide, all low molar mass reaction side product could be separated from the product, although the branched polymer structure is known for trapping organic molecules 14) . The structure and the degree of modification were verified by high-resolution proton NMR spectroscopy.…”

Preparation And Characterization Of Photosensitive Hyperbranched Aliphatic Polyester

“…One of the exciting and promising developments in material science today is the design and synthesis of hyperbranched polymer materials which are found to have potential applications in the field of functional materials [1][2][3], such as films [4][5], coatings [6], adesive agents [7], modifiers and so on [8].The candidate materials include polyurethane acrylateand hyperbranched polyester polyamide etc [9]. It is well known that hyperbranched polyester possesses a variety of unique proprieties such as good solubility, low viscosity, multivalence, and encapsulation effects, which mainly are caused by the branching and spherical architecture.…”