The influence of polyethylene in the mechanical recycling of polyethylene terephtalate

Chemical recycling of poly(ethylene terephthalate). Application to the synthesis of multiblock copolyesters

“…The reaction is performed at 240°C because of the high melting point of PET oligomers, using Ti(OBu) 4 as a catalyst, as shown in Figure 4. As reported in the literature, the Ti(OBu) 4 is more reactive when being used at a reaction temperature of 240°C and enhances somewhat the -M n obtained [42].…”

“…The reaction is performed at 240°C because of the high melting point of PET oligomers, using Ti(OBu) 4 as a catalyst, as shown in Figure 4. As reported in the literature, the Ti(OBu) 4 is more reactive when being used at a reaction temperature of 240°C and enhances somewhat the -M n obtained [42]. For titanium catalytic system, studied by Fradet and Marechal [43], the acid function coordinates with Ti, and some experiments of Fradet and Marechal show that the system follows thermodynamic laws.…”

“…If the glass transition temperature of the copolyester, determined by DSC analysis, is close to the calculated one, the hypothesis of non-phase segregation is confirmed. The Fox-Flory equation (Equation (4)) gives the theoretical value of glass transition temperature of -24°C for this copolyester: (4) where ! i is the fraction weight of polymer i in the blend and T g i the glass transition temperature of the polymer i.…”

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

“…Likewise, additives were developed to improve viscosity and impact strength of recycled PET, but the recyclate was excluded from food packaging in Europe [80]. Besides such additives, the addition of other polymers (e. g. polyethylene, polypropylene) or inorganic materials (clay minerals) has been applied for thermomechanical PET recycling to improve mechanical properties of the recyclate [81][82][83][84][85][86][87][88][89][90][91][92][93][94]. In addition to blending PET with a second polymer, the use of compatibilizers such as ethylene vinyl acetate, ethylenebutyl acrylate-glycidyl methacrylate copolymer, poly (styrene-ethylene/butylene-styrene) and epoxy-chain extenders has been applied to further improve mechanical properties [82][83][84][85][86].…”

Study the Morphological and Mechanical Properties of Ultra-high Molecular weight polyethylene UHMWPE: Polytetrafluroethylene PTFE binary blends

“…Polytetrafluroethylene (PTFE) presently discover increasing Using in high performance seals due to its remarkable properties like high chemical resistivity, low coefficient of friction and high temperature stability [1,2]. Yanhong Yan et.al prepared advance composite materials based on PTFE reinforced with expanded Graphite fiber and various nano particles of metal such as Cu and ceramics including (TiO2, S iO2 and Al2O3.…”