Polyurethane foams from oligomers derived from waste tire crumbs and polycaprolactone diols

Abstract

This work was an initial study on the synthesis of polyurethane foams (PUF) by using diols obtained from the controlled degradation of waste tire crumbs and from polycaprolactone (PCL) followed by examination of their biodegradability. Natural rubber (NR, cis−1,4 polyisoprene) and butadiene rubber (BR) chains contained in waste tire crumbs were chemically modified into carbonyl telechelic (CTWT) and successively into hydroxyl telechelic oligomers (HTWT). Four types of PUF were prepared with different molar ratios between the HTWT and the PCL diols. CTWT and HTWT were analyzed by 1H‐NMR, SEC, and FT‐IR to confirm their chemical structure. Formation of the urethane bond was demonstrated by FT‐IR spectra. The addition of the PCL diol increased the thermal degradation temperature of the PUF based on thermogravimetric analysis. According to scanning electron microscopy, polyhedral closed cells were obtained. The molar ratio of HTWT/PCL diols strongly affected the kinetic rate of foam formation and foam morphology. A low kinetic rate provided PUF with a high density, small cell size, and a broad cell size distribution. In order to assess biodegradation of PUF, the modified Sturm test was carried out for 60 days at ambient temperature (27–30 °C). The biodegradation of PUF containing only HTWT was 31.2% and 51.3% at 28 days and 60 days of testing, respectively whereas the PUF containing 1/0.5 HTWT/PCL diols (by mole) showed a higher biodegradation: 39.1% and 64.3% at 28 days and 60 days of testing respectively. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44251.

Research of TPU Materials for 3D Printing Aiming at Non-Pneumatic Tires by FDM Method

“…In the tire industry, TPU materials are the desirable material to replace rubber materials for the manufacture of high-performance tires, because of good elasticity and thermoplastic processing [14,15]. Currently, the number of waste tires has substantially increased with rapidly growing automobile and transportation development [15][16][17].…”

ɛ-caprolactone and pentaerythritol derived oligomer for rigid polyurethane foams preparation

“…6 The PUFs obtained from hydroxyl groups-ended PCL and natural rubber were also reported. 7, 8 A triol obtained from PCL was used to obtain semi-elastic PUFs of low density, 9 and nanocomposite of PUF with fullerenes. 10 The synthesis of polyol from ε-CL, adipic acid diethylene glycol and 2-ethyl-2-(hydroxymethyl)-propane-1,3-diol was described in a patent.…”

Mechanical Properties Evaluation of Concrete with Crumb Rubber Particles used as Fine Aggregate

“…Pyrolysis is another method to decompose waste tires into carbon and oil by heating in the absence of oxygen. It is a good method to manage the problem of waste tires but with a major drawback of environmental pollution [2]. Efforts have been made to utilize waste tires by making composites using materials like concrete, waste plastic and wood, among others, for construction purposes, furniture and other uses.…”