Preparation of adipic acid-polyoxypropylene diamine copolymer and its application for toughening epoxy resins

Ren, Xi; Peng, Shumin; Zhang, Wei; Yi, Chunwang; Fang, Yuan; Hui, David

doi:10.1016/j.compositesb.2017.03.019

Cited by 27 publications

(14 citation statements)

References 43 publications

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“…22,23 The absorption peak of the amide I band at 1637 cm −1 and the absorption peak of the amide II band at 1542 cm −1 correspond to the characteristic peaks of PA6. 24–27 Obviously, all of these mentioned characteristic peaks can be observed in the patterns of pure PA6, waste PA6/PU debris and all separated samples. The infrared spectrum of waste PA6/PU debris is similar to that of PA6, except for a stretching vibration peak of the ester carbonyl group (C=O) presenting at 1717 cm −1 and a broad peak at 750–800 cm −1 attached to the PU.…”

Section: Resultsmentioning

confidence: 93%

Simple process for separation and recycling of nylon 6 and polyurethane components from waste nylon 6/polyurethane debris

Gong

Zhang

Yang

et al. 2020

Textile Research Journal

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The nylon 6 (PA6)/polyurethane (PU) debris produced during the sanding process would result in a serious resource waste and environmental hazard if disposed of inappropriately. Therefore, this study proposed a simple process for separating and recycling PA6 and PU components of PA6/PU debris. Results revealed that the instantaneous dissolution of PU in N,N-dimethylformamide was independent of temperature and time but related to the quantity of the solvent. Further investigation showed that 43.2% of waste PA6/PU debris was dissolved at room temperature, with pulp density of 10% and within 10 minutes, indicating that PA6 and PU could be quickly separated from the waste PA6/PU debris. In addition, proton nuclear magnetic resonance indicated that the dissolved PU could be recovered by selective precipitation-stripping using an equal amount of deionized water. Moreover, the chemical structure analysis disclosed that the PU in PA6/PU debris should be polyether PU synthesized by reacting with methylene diphenyl diisocyanate and polyether polyols. Besides, the stable chemical structure and thermal properties of separated samples observed from differential scanning calorimetry and thermogravimetry results confirmed that the recycling products could be reused as recycled plastic materials.

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Section: Resultsmentioning

confidence: 93%

Simple process for separation and recycling of nylon 6 and polyurethane components from waste nylon 6/polyurethane debris

Gong

Zhang

Yang

et al. 2020

Textile Research Journal

Self Cite

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“…The impact strength of Si‐epoxy composites was enhanced by adding suitable amounts of PSE, which could be attributed to the reduction of internal residual stress and the dissipating of impact energy due to the motion of flexible –Si–O–Si– molecule chains in epoxy networks . At 90 K, the flexible –Si–O–Si– chains had better movability than neat epoxy networks and hence still could dissipate the impact energy .…”

Section: Resultsmentioning

confidence: 95%

“…As shown in Table , the tensile strength and Young's modulus of the Si‐epoxy composites with the same PSE content at 90 K was higher than that at RT, which attributed to the fact that the intramolecular binding forces become strong as temperature drops . In addition, the failure strain at 90 K was much lower than that at RT.…”

Section: Resultsmentioning

confidence: 99%

Epoxy‐functionalized polysiloxane reinforced epoxy resin for cryogenic application

Wang

Liu

et al. 2018

J of Applied Polymer Sci

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The poor cryogenic mechanical properties of epoxy resins restrict their extensive application in cryogenic engineering fields. In this study, a newly synthesized epoxy-functionalized polysiloxane (PSE) is used to improve the cryogenic mechanical properties of bisphenol-F epoxy resin. The Fourier transform infrared spectra and nuclear magnetic resonance confirm the formation of epoxyfunctionalized -Si-O-Simolecular chain. The surface free energy test results show that the PSE has a better compatibility with epoxy resin. The mechanical test results show that the cryogenic tensile strength, failure strain, fracture toughness, and impact strength of epoxy resin is improved significantly by adding the suitable amounts of PSE. Compared to the neat epoxy resin, the maximum tensile strength (196.92 MPa, an improvement of 11.2%), failure strain (2.97%, an improvement of 33.8%), fracture toughness (3.05 MPaÁm 1/2 , an improvement of 30.7%) and impact strength (40.55 kJ m −2 , an improvement of 14.8%) at cryogenic temperature (90 K) is obtained by incorporating 10 wt % PSE into the neat epoxy resin. Moreover, the results also indicated that the tensile strength, Young's modulus, and fracture toughness of epoxy resin with the same PSE content at 90 K are higher than that at room temperature (RT).

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“…Therefore an energy dissipation mechanism will be involved due to the mobility of exible PPG, which have been reported in reactive and homogeneous exible polymers modied epoxy systems. 40,44 However, there is also a disadvantage that the mobility of PPG blocks will be restricted by covalent bonding between PGMA and epoxy network. And this restriction will be more signicant with the addition of higher GPG83 loading (5 wt%) as the cross-link density increase.…”

Section: Strengthen and Toughening Mechanismmentioning

confidence: 99%

Toward simultaneous toughening and reinforcing of trifunctional epoxies by low loading flexible reactive triblock copolymers

et al. 2018

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Flexible reactive poly(glycidyl methacrylate)-b-poly(propylene glycol)-b-poly(glycidyl methacrylate) (GPG) and nonreactive poly(ethylene glycol)-b-poly(propylene glycol)-b-poly(ethylene glycol) (EPE80) were utilized to toughen a trifunctional epoxy (diglycidyl 4, 5-epoxycyclohexane-1, 2-dicarboxylate, TDE-85).In comparison with the nonreactive EPE80 and reactive GPG92 with long reactive blocks (L reactive ), the incorporation of reactive GPG83 with short L reactive improved the comprehensive mechanical properties of the epoxy. Upon an optimal GPG83 loading of 2.5 wt%, the tensile strength, elongation at break and critical strain energy release rate (G 1c ) increased by ca. 31%, 45.9% and 130.8%, respectively, without sacrificing the modulus and thermal stability. Morphology characterization evidenced that micro-scale domains and nanosized vesical micelles coexisted in the nonreactive EPE80 toughened systems.However, homogeneous morphologies were formed in reactive GPG83 and GPG92 toughened systems.Fracture morphology analysis suggested that GPG can toughen epoxy thermosets by incorporating flexible PPG blocks into the epoxy network, thereby enabling an energy dissipation mechanism. The good balance between the mobility of flexible PPG and degree of cross-link density leads to the simultaneous toughening and reinforcing effect of GPG83 toward the trifunctional epoxy.

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Preparation of adipic acid-polyoxypropylene diamine copolymer and its application for toughening epoxy resins

Cited by 27 publications

References 43 publications

Simple process for separation and recycling of nylon 6 and polyurethane components from waste nylon 6/polyurethane debris

Simple process for separation and recycling of nylon 6 and polyurethane components from waste nylon 6/polyurethane debris

Epoxy‐functionalized polysiloxane reinforced epoxy resin for cryogenic application

Toward simultaneous toughening and reinforcing of trifunctional epoxies by low loading flexible reactive triblock copolymers

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