Effect of the modified silica Nanofiller on the Mechanical Properties of Unsaturated Polyester Resins Based on Recycled Polyethylene Terephthalate

Abstract

Unsaturated polyester resin (UPe)-based nanocomposites and fumed silica Aerosil R812S, R805 and R816, and R200 modified with phenyl terminal group, R200NPh, were prepared. UPe resins were synthesized from maleic anhydride and products of glycolysis, obtained by polyethylene terephthalate depolymerization with dipropylene glycol in the presence of tetrabutyl titanate catalyst. The obtained unsaturated polyesters were characterized by acid, hydroxyl, and iodine values and by FTIR and NMR analysis. The microstructural analysis of the prepared nanocomposites, performed by using transmission electron microscopy, confirmed that silica nanoparticles formed chain-like aggregates in the polymer matrix. The presence of modified silica nanoparticles had no influence on the glass transition temperature and thermal stability of polyester matrix.

Cross‐Linkable Modified Nanocellulose/Polyester Resin‐Based Composites: Effect of Unsaturated Fatty Acid Nanocellulose Modification on Material Performances

“…In the first step, at temperatures ≤ 200 °C, mass loss is a result of the removal of low amount of residual styrene and the low‐boiling reactants. The mass loss, observed between 200 and 450 °C, corresponds to the decomposition of the polymer network and high‐temperature thermal reactions/degradation processes which produce condensed/degraded carbonaceous materials . Intermolecular interactions between UPe/m‐NC, m‐NC, and volatile decomposition products have appropriate influence on thermal properties.…”

“…UPe was synthesized from MA and products, obtained by PET depolymerization with PG in the presence of TBT catalyst, according to the procedure presented in the previous work . Following the glycolysis procedure described earlier, molar ratio of PET and PG used for glycolysis was 1:2.2 and the reaction was maintained at 210 °C. After the completion of the glycolysis reaction, keeping inert atmosphere, the mixture was cooled down to 90 °C and the Dean–Stark separator was assembled.…”

Oligoester and Polyester Production via Acido-alcoholysis of PET Waste

“…[7][8][9] In some cases, the glycolysis products were further used without any purification steps [41][42][43]. Our own experience (unpublished results) and other studies on glycolysis show molecular mass distribution usually with well distinguishable peaks.…”

Synthesis of high-performance alkyd anticorrosion coatings based on waste poly(ethylene terephthalate)

“…Various oligoesters (glycolysis products) can be obtained by PET depolymerization using DPG. The waste PET glycolyzates G-DPG present the mixture of isomers: bis[1-(2 hydroxypropoxy) propan-2-yl] terephthalate as a result of transesterification by 4-oxa-2,6heptandiol; bis[2-(1-hydroxypropran-2-yloxy)propyl] terephthalate as a result of transesterification by 2-(2-hydroxy-1-methyl-eyhoxy)-propan-1-ol; and the mixture with major fraction of bis[2-(2-hydroxypropoxy)propyl] terephthalate, minor fraction of bis[1-(1-hydroxypropan)-2-yloxy)propan-2-yl] terephthalate and mixed ester of terephthalic acid as a result of the transesterefication with 2-(2hydroxy-1-methyl-ethoxy)-propan-1-ol [18]. The HV and AV values and the data obtained from elemental analysis of the glycolyzed products are presented in Table 2.…”

“…2.2b) are: 1 H NMR: 0.87 (m, 6H, 2×CH 3 ); 3.61 (m, 8H, 4×CH 2 OH); 3.73 (m, 4H, 4×CH 2 OH); 4.28 -4.51 (m, 8H, 4×COOCH 2 , TME and EG moiety); 7.20 (m, 2H, H Ph ); 7.85 -8.09 (m, 6H, H Ph ). NMR: 7.50 (2×CH 3 ), 22.74 (CH 3 CH 2 ); 43.02 (C(CH 2 CH 3 )(CH 2 OH) 2 (CH 2 )); 65.16 (COOCH 2 , TME moiety); 76.38-77.65 (COOCH 2 , EG moiety); 129.78 (4×C Ph ); 133.79 (2×Ph(C)COO); 165.83 (2×COO).NMR analysis of the G-DPG revealed the existence of mixture of oligoesters as a result of transesterification reactions by DPG mixture[18]. NMR spectra of G-DPG are shown inFigure ResultsNMR analysis of the synthesized anticorrosive alkyd resins are: AR1: NMR (200 MHz, CDCl 3 ): δ = 0,75-1,06 (m, 9H, CH3), 1,18-1,42 (s, 23H, CH 2 ), 1,47-1,77 (s, 5H, CH 2 ), 1,88-2,16 (m, 6H, =CHCH 2 ), 2,21-2,39 (m, 4H, CH 2 COOCH 2 ), 2,62-2,86 (m, 4H, =CHCH 2 CH=), 3,42-3,74 (m, 2H, PACOOCH 2 i alkilCOOCH 2 ), 4,03-4,74 (m, 9H, TPACOOCH 2 ), 5,24-5,49 (d, 7H, -CH=CH-), 6,90-7,82 (d, 4H, PAH), 7,92-8,08 (d, 1H, TPAH) ppm;Due to the similarity of the corresponding NMR spectra of other resin based on the G-TMP (AR2), the results are not presented.…”