Viscoelastic behavior of segregated networks

Lipatov, Yu.S.; Rosovizky, V. F.; Maslak, Yu. V.

doi:10.1002/app.1982.070271202

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…However, the excessive cost of high-purity synthons extracted from these renewable resources and a complicated derivative process make bio-based feedstock processing difficult to carry out on an industrial scale. 38,39 However, these problems are absent from random copolymerization reactions due to the fact that a homogeneous system can be obtained through chemical modification. Therefore, it is critical to search for other renewable resources and feasible green synthetic routes in an effort to obtain polyester materials with appropriate thermal and mechanical properties (i.e.…”

Section: Introductionmentioning

confidence: 99%

Toughened aromatic poly-(decylene terephthalate) copolyesters with two renewable eugenol-based components via a random copolymerization method

Zhao

et al. 2016

Polym. Chem.

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Poly-(decylene terephthalate) PDT homopolyester and two series of thermoplastic PDT 1−x M1 x and PDT 1−x M2 x copolyesters with varying molar compositions (x = 0%, 20%, 40%, 60%, 80%, 100%) were prepared via random copolymerization of dimethyl terephthalate (DMT) and 1,10-decanediol, with renewable eugenol-based subunits providing toughener properties. These eugenol-based tougheners were synthesized via a thiol-ene click reaction and subsequent nucleophilic substitutions. The obtained copolyesters exhibit averaged molecular weights (M w s) ranging between 26 800 and 55 300 g mol −1 , together with dispersity (D) values between 1.8 and 2.2. 1 H NMR, 13 C NMR and FTIR spectroscopic analyses were carried out as structural characterization techniques. The quantitative 13 C NMR spectra of PDT 1−x M1 x indicate that the copolyesters feature random microstructures. The results from thermogravimetric analysis (TGA) show that thermal stabilities of both PDT 1−x M1 x and PDT 1−x M2 x species gradually decrease with increasing toughener contents. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) were carried out in order to study the thermo-mechanical properties of the polyesters.The toughener content proves to have no significant influence on the glass transition temperatures (T g s) of the copolyesters, despite the fact that an inconspicuous T g value was observed for the PDT homopolyester. Furthermore, the gradually diminishing melting enthalpy (ΔH m ) results from a decreasing crystallinity upon increase of the toughener unit content, suggesting that the incorporation of eugenol-based tougheners into PDT reduces the crystallinity in a significant manner. Isothermal crystallization and wide X-ray diffraction (WXRD) techniques provide evidence for this conclusion as well. The amount of eugenol-based units significantly influences the observed toughening effect. Strong tenacity of the brittle PDT was realized from the tensile and impact assays, with the content of the tougheners up to 20%.Specifically, the impact strength increases up to 16.4 and 15.8 kJ m −2 for PDT 80% M1 20% and PDT 80% M2 20% , respectively. Simultaneously, the ultimate strength decreases 2.6-4.3 MPa from 16.8 MPa to 12.5-14.2 MPa and elongation at break increases from approximately 5% to 18-20%. The findings described herein prove to be particularly important from a commercial point of view to meet the strict requirements for a variety of potential applications of such polyester species in structural materials. † Electronic supplementary information (ESI) available: Additional figures and Scheme S1. See

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Section: Introductionmentioning

confidence: 99%

Toughened aromatic poly-(decylene terephthalate) copolyesters with two renewable eugenol-based components via a random copolymerization method

Zhao

et al. 2016

Polym. Chem.

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“…Progress in polymer‐based hybrid materials has been remarkable during this century and we can now design leading‐edge materials with various functionalities using blends as well as chemical modification. [ 1–4 ] In a blend, the compatibilizer has an important role, [ 5–9 ] because the miscibilities of polymers are often inhibited by the entropic penalty of polymer chains working against the mixing enthalpy. Poly(2‐oxazoline), used as a compatibilizer, is typically prepared by ring‐opening polymerization of 2‐oxazoline and the structure is a polymeric analogue of the highly polar solvent N,N ‐dimethyl formamide (DMF).…”

Section: Introductionmentioning

confidence: 99%

Grafting of Poly(2‐Oxazoline) Side Chains from Polyester Containing Oxazoline Units and Their Blends with Water Soluble Vinyl Polymers

Fukaya

Takasu

2020

Macro Chemistry & Physics

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Ternary polycondensation of thiomalic acid (TMA), adipic acid (ADA), and 1,5‐pentanediol (PD) at 80 °C proceeds to give polyester having pendent mercapto groups. After the mercapto groups are consumed quantitatively by a Michael addition with 2‐isopropenyl‐2‐oxazoline (IPOx) to create an initiation point for grafting, successive additions of methyl triflate (MeOTf) and 2‐oxazoline allow ring‐opening polymerization of 2‐oxazoline from the IPOx unit to give a graft copolymer with a Mn of 2.2 × 104 ‐ 3.7 × 104 and an molecular dispersity index (Mw/Mn = 1.9–2.6). The synthesized polyester‐based graft copolymer is water‐soluble and forms transparent blend films with poly(vinyl alcohol) (PVA) and poly(N‐isopropy acrylamide) (PNIPAM) using solvent cast methods. Differential scanning calorimetry measurements show that blends with PVA (<30% of the graft copolymer) show a single Tgs over the whole composition range. All scans for the blends with PNIPAM have a single Tgs that is between those of the parent polymers indicating that the graft copolymer shows excellent miscibility with PNIPAM, although the parent polyester, poly(TMA‐alt‐PD)‐co‐poly (ADA‐alt‐PD) does not exhibit such miscibility.

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“…Due to the outstanding electrical isolation, mechanical strength and excellent toughness, Polyarylene ether nitrile (PEN) has received increasing attraction both from industry and academia as a kind of engineering thermoplastic . The previous study in our laboratory showed that phthalonitriles/PEN polymers can form the thermoset–thermoplastic interpenetrating polymer networks (IPNs) materials and exhibit synergistic properties, which are better than the property of single component .…”

Section: Introductionmentioning

confidence: 99%

Mechanical, thermal, electrical, and interfacial properties of high-performance bisphthalonitrile/polyarylene ether nitrile/glass fiber composite laminates

et al. 2013

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Bisphthalonitrile (BAPh)/polyarylene ether nitrile end‐capped with hydroxyl groups (PEN‐OH) composite laminates reinforced with glass fiber (GF) have been fabricated in this article. The curing behaviors of BAPh/PEN‐OH prepolymers have been characterized by differential scanning calorimetry and dynamic rheological analysis. The results indicate that with the introduction of PEN‐OH the curing temperature of BAPh has decreased to 229.6–234.8°C and BAPh/PEN‐OH prepolymers exhibit large processing windows with relatively low melt viscosity. The BAPh/PEN‐OH/GF composite laminates exhibit tensile strength (272.4–456.5 MPa) and modulus (4.9–10.0 GPa), flexural strength (507.1–560.9 MPa), and flexural modulus (24.0–30.4 GPa) with high thermal (stable up to 538.3°C) and thermal stabilities (stable up to 475.5°C). The dielectric properties of BAPh/PEN‐OH/GF composite laminates have also been investigated, which had little dependence on the frequency. Meanwhile, scanning electron microscopy results show that the BAPh/PEN‐OH/GF composite laminates display excellent interfacial adhesions between the matrix and GFs. Herein, the BAPh/PEN‐OH matrix can be a good matrix for high‐performance polymeric materials and the advanced BAPh/PEN‐OH/GF composite laminates can be used under high temperature environment. POLYM. COMPOS., 34:2160–2168, 2013. © 2013 Society of Plastics Engineers

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Viscoelastic behavior of segregated networks

Cited by 9 publications

References 3 publications

Toughened aromatic poly-(decylene terephthalate) copolyesters with two renewable eugenol-based components via a random copolymerization method

Toughened aromatic poly-(decylene terephthalate) copolyesters with two renewable eugenol-based components via a random copolymerization method

Grafting of Poly(2‐Oxazoline) Side Chains from Polyester Containing Oxazoline Units and Their Blends with Water Soluble Vinyl Polymers

Mechanical, thermal, electrical, and interfacial properties of high-performance bisphthalonitrile/polyarylene ether nitrile/glass fiber composite laminates

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