Synthesis and Characterization of UV‐Curable Resins from the Glycolysis of PET: Vinyl Ether/Maleate UV‐Curing System

Auvergne, Rémi; Colomines, Gaël; Robin, Jean Jacques; Boutevin, Bernard

doi:10.1002/macp.200600594

Cited by 14 publications

(5 citation statements)

References 41 publications

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“…Photopolymerization is a very flexible process that can be used in various technological applications because of its high curing rate, reduction of volatile organic compounds (VOC), and low cost 1. In this process, monomers react to produce polymeric structures by light‐induced initiation (excitation of a photoinitiator) and subsequent polymerization 2, 3. A growing interest for this technique has been developed as it allows the cross‐linking of resins in a short time under UV radiation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Photopolymerization of Novel Phosphonated Resins, 2

Senhaji¹,

Monge²,

Chougrani³

et al. 2008

Macro Chemistry & Physics

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New phosphonated cross‐linked polymers were synthesized from telomers obtained by reaction between 10‐undecenol and dialkyl hydrogenphosphonates. Telomers were studied using MALDI‐TOF MS. It was proven that side products were produced, corresponding to cross‐esterification reactions of dialkyl hydrogenphosphonate on telomers and to radical additions of telomer on 10‐undecenol. The same behavior was also observed with allyl alcohol. Telomers were then converted to resins by methacrylation reactions. Finally, photopolymerization of the different resins synthesized was achieved and influence of the nature of the phosphonate group (diester, monoacid and diacid) was also evaluated.magnified image

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Photopolymerization of Novel Phosphonated Resins, 2

Senhaji¹,

Monge²,

Chougrani³

et al. 2008

Macro Chemistry & Physics

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“…The equivalent weight of the isocyanates was calculated as follows:

Equivalent weight of isocyanate goodbreak= \frac{4,200}{NCO value} g / italicequivalent .

Similarly, the equivalent weight of the polyols was calculated as follows:

Equivalent weight of normala polyol goodbreak= \frac{56,100}{OH value} g / italicequivalent,

where the hydroxyl value was obtained with titration methods with a 0.5 N NaOH standard solution 40,41 …”

Section: Methodsmentioning

confidence: 99%

“…The solution was heated at 100°C for approximately 2 h. Thereafter, it was cooled to room temperature and diluted with 100 ml water. Under vigorous stirring, the resulting solution was titrated with a 0.5 N NaOH standard solution with phenolphthalein as an indicator 40,41

hydroxyl value ((), \frac{mg}{normalg}) goodbreak= \frac{56.1 ((), normalV 0 goodbreak- normalV 1) normalT}{m} goodbreak+ acid value,

where V 1 is the volume (mL) of the NaOH solution used for the test sample, 42 V 0 the volume (mL) of NaOH solution for the blank sample, m (g) the mass of the sample, and T the normality of the NaOH solution (mol/L).…”

Section: Methodsmentioning

confidence: 99%

Single‐catalyst reactions from depolymerization to repolymerization: Transformation of polyethylene terephthalate to polyisocyanurate foam with deep eutectic solvents

Lee

Jung

2022

J of Applied Polymer Sci

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Polyisocyanurate (PIR) has been used as a flame retardant insulation material because of its improved thermal insulation and flame-retarding effects due to its cyclic structure with an isocyanate trimer group. When a deep eutectic solvent (DES) is used as a catalyst, PET glycolysis produces bis(2-hydroxyethyl terephthalate) (BHET) and its derivatives. These recycled polyols react with isocyanate to form PIR foam (PIRF) in the presence of a physical blowing agent. DES-based glycolysis is a low-energy process with a relatively low temperature and short reaction time. In this study, a potassium-based DES system was applied for the sequential depolymerization and repolymerization of waste PET into PIRFs. Potassium-based DESs were used as hydrogen bond acceptors (HBAs), and ethylene glycol (EG), glycerol, and urea were used as hydrogen bond donors (HBDs). The PIRF was obtained through one-pot depolymerization and repolymerization with a single-catalyst DES system. All DES catalyst systems effectively decomposed PET; the PET conversion efficiency reached 95% after 2 h reaction. The recycled PIR was more thermally stable (approximately 26.9% limiting oxygen index (LOI) and approximately 68.8 W/g heat release rate (HRR)). This paper presents an environmentally friendly and robust upcycling process for the transformation of waste PET into PIRF.

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“…Equivalent weight of a polyol ¼ 56, 100 OH value g=equivalent: where the hydroxyl value was obtained via titration methods with a 0.5 N NaOH standard solution. 20,21 Finally, the isocyanate index was obtained using the following equation:…”

Section: Nco Value G=equivalentmentioning

confidence: 99%

Flame retardancy of polyurethane foams prepared from green polyols with flame retardants

Lee

Jung

2021

J of Applied Polymer Sci

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Polyurethane foams (PUFs) were synthesized using bis(2-hydroxyethylene terephthalate) (BHET), 1,4-cyclohexanedimethanol (CHDM), and polycaprolactone diol (PCLD), and their flame retardancies were investigated. BHET and CHDM are eco-friendly chemicals derived from waste polyethylene terephthalate, and PCLD is a precursor monomer used for synthesizing biodegradable polymers. Expandable graphite (EG) and tris(1-chloro-2-isopropyl) phosphate (TCPP) were used as flame retardants. For conventional PUFs prepared with an aliphatic polyol, thermal stability was significantly enhanced with EG and TCPP through thermogravimetric analysis (TGA) and microcombustion calorimetry (MCC). PUFs prepared with BHET and CHDM exhibited higher thermal stability than conventional PUFs. This is attributed to the alicyclic and aromatic ring structures, which contribute to thermally stable char formation during pyrolysis. PCLD was introduced as an additional polyol, as well as a possible flame retardant, without the addition of EG and TCPP. PUFs were successfully prepared and exhibited improved resilience to burning up to 300 C due to the intrinsic thermal stability of PCLD. The limiting oxygen index (LOI) indicated that PUFs containing BHET moiety exhibited higher LOI values, whereas PUFs prepared with PCLD showed the lowest LOI value. PCLD can be used as a polyol; however, additional flame retardants are needed to obtain high flame retardancy for PUFs.

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Synthesis and Characterization of UV‐Curable Resins from the Glycolysis of PET: Vinyl Ether/Maleate UV‐Curing System

Cited by 14 publications

References 41 publications

Synthesis, Characterization, and Photopolymerization of Novel Phosphonated Resins, 2

Synthesis, Characterization, and Photopolymerization of Novel Phosphonated Resins, 2

Single‐catalyst reactions from depolymerization to repolymerization: Transformation of polyethylene terephthalate to polyisocyanurate foam with deep eutectic solvents

Flame retardancy of polyurethane foams prepared from green polyols with flame retardants

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