Papers by Keyword: Long Chain

Abstract: This research aimed to recycle polyethylene terephthalate (rPET) from drinking water bottles using a commercial multi-functional chain extender (Joncryl®ADR4468) with low content, to improve the properties of low molecular weight recycled PET, giving it a long chain with branching structure. The effects of the chain extender on the structural change, viscosity, thermal properties and thermal stability of modified recycled PET (modified-rPET) were studied by using Fourier transform infrared (FTIR) spectrometer, a rotational rheometer, a differential scanning calorimeter (DSC) and thermogravimetric analysis technique (TGA). The results indicate that the chain extender can increase the molecular weight and modify the structure of rPET to a long chain with branching structure and improve the viscosity. Furthermore, the thermal properties and thermal stability analysis from this research could be great evidence to support the assumption that the use of low dose of Joncryl®ARD4468 could turn the molecular structure of rPET into long chain with branching structure, without gel, perfectly.

Abstract: Waterborne cationic fluorinated polyurethane (WCFPU) was prepared by the reaction of isophorone isocyanate (IPDI), polyether polyol (PTMG1000), N-methyldiethanolamine (MDEA), trimethylol propane (TMP) and 2-(perfluorooctyl) ethyl alcohol (FEOH) and then the films of the WCFPU were prepared. Their structure, surface property, mechanical properties, thermal performance and chemical resistance of their membrane were characterized by fourier transform infared spectrometer (FT-IR), interfacial tension instrument (IT), contact angle (CA), thermogravimetry (TG) and spot test. The results revealed that WCFPU was endowed with good mechanical properties and low surface energy of its film. TG diagrams also revealed that the application range of product was enlarged. It was also found that the fluorinated polyurethane had outstanding chemical resistance.