Preparation and characterization of poly(m-xylylene oxamide) and its copolymer

Mutua, Fredrick Nzioka; Wu, Zhongbiao; Dong, Yusheng; He, Yong

doi:10.1080/10601325.2017.1322467

Cited by 4 publications

(6 citation statements)

References 24 publications

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“…Two intense diffractions at 2θ of 20° and 24° corresponding to d‐spacing of 4.5 and 3.7 Å, respectively, were observed for PA62, which were characteristic of α form of polyamides and the same as reported in literature . PMXD2 displayed four strong diffractions at 2θ of 18°, 20°, 23°, and 26°, corresponding to d‐spacing of 4.7, 4.4, 3.8, and 3.3 Å, respectively. For the copolymer, the diffractions at 2θ of 20° and 24° became weaker with the increase of MXD2 unit content and cannot be discerned when PMXD2 content was higher than 50 mol %.…”

Section: Resultssupporting

confidence: 78%

Synthesis and characterization of poly (1,6‐hexamethylene oxamide‐co‐m‐xylene oxamide) copolymers

Yang

Mutua

Gao

et al. 2018

Polymers for Advanced Techs

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To modify the properties of poly (hexamethylene oxamide) (PA62), m-xylylene diamine (MXD) was introduced into the polyamide main chain. A series of high molecular weight PA62/MXD2 were synthesized via a two-step method. The chemical structure of polymer was analyzed by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy, and the results confirmed the formation of PA62/MXD2. DSC test showed that the T m of the copolymers were decreased as the molar contents of MXD in the range of 10 to 50 mol %. TGA analysis revealed that the thermal stability of the copolymers compared well with commercial PA6. Wide-angle X-ray diffraction studies suggested the copolymers with MXD content of 0 to 10 mol % possessed high crystallinity. The water uptake measurements were monitored, and the saturated water absorptions were found to be lower than 2.5 wt %. These properties gave them a competitive edge for application where precise dimensional stability and high thermal resistanceproperties are required.

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Section: Resultssupporting

confidence: 78%

Synthesis and characterization of poly (1,6‐hexamethylene oxamide‐co‐m‐xylene oxamide) copolymers

Yang

Mutua

Gao

et al. 2018

Polymers for Advanced Techs

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“…This required identification of appropriate precursors possessing multiple primary amine functionalities where amine end groups can couple to dioxalate species to produce oxalamide bonds allowing the interior hydrocarbon combined with oxalamide linkages to limit absorptions in the 8–12 μm region. Previous poly(oxalamide) work using straight-chain aliphatic diamines produced crystalline, high-melting-point products. , However, crystallinity must be suppressed to minimize scattering, particularly in the visual spectrum. As a result, branched species were favored to produce a more amorphous network and higher degree of optical transmission.…”

Section: Resultsmentioning

confidence: 99%

“…Previous poly(oxalamide) work using straight-chain aliphatic diamines produced crystalline, high-melting-point products. 21,23 However, crystallinity must be suppressed to minimize scattering, particularly in the visual spectrum. As a result, branched species were favored to produce a more amorphous network and higher degree of optical transmission.…”

Section: Resultsmentioning

confidence: 99%

Visually and Infrared Transparent Poly(oxalamide) Films with Mechanical Toughness

Nowak

Gross

Drummey

et al. 2022

ACS Appl. Polym. Mater.

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The growing maturity and sophistication of autonomous vehicles incorporate increasing numbers of sensors to produce multiple data streams detailing vehicle surroundings. As part of the continuous and reliable transmission of data, protection of lenses and windows for sensors from environmental damage is necessary across bands including visible (400–750 nm), near IR (0.75 to 1.5 μm), and thermal wavelengths (8–15 μm). Here, we report a cross-linked poly(oxalamide) based on aliphatic amine monomers and dioxalate species, resulting in transparency in both visible (400–750 nm) and multiple IR bands (0.75–1.5 μm, 3.5–5.5 μm, and 8–12 μm). Mechanical toughness (ε = ∼200%, σ = 35 MPa) and network resiliency toward fluids and thermal exposure are reflective of the cross-linked network and contribute to durability and the potential to protect brittle substrates. This was demonstrated by casting free-standing films bonded onto a germanium window using the identical poly(oxalamide) resin as an adhesive. Imaging through a thermal IR camera with the coated window before and after exposure to an abrasive sand stream showed the ability to protect the underlying substrate and maintain image quality while the unprotected window was severely degraded.

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“…Spray polymerization free from solvent was set up as described in our previous work . To synthesize PM52 prepolymer, each of the 2 monomers (M52 and DO) was separately injected into a 26G stainless steel needle with length of 1 m using a syringe pump (LSP01‐1A, Longer Precision Pump Co., Ltd., China) at a flow rate of 160.9 μL/min for M52 and 226.9 μL/min for DO.…”

Section: Methodsmentioning

confidence: 99%

“…Spray polymerization free from solvent was set up as described in our previous work. 19 To synthesize PM52 prepolymer, each of the 2 monomers (M52 and DO) was separately injected into a 26G stainless steel needle with length of 1 m using a syringe pump (LSP01-1A, Longer Precision Pump Co., Ltd., China) at a flow rate of 160.9 μL/min for M52 and 226.9 μL/min for DO. The flow rates of the monomers were carefully calibrated and precisely controlled to ensure that the stoichiometric molar ratio of diamine/DO was 1/1 at the tips of the 2 needles, which were tightly fastened and placed at the center of the After approximately 20 minutes, the collecting tube was disconnected from the system and placed in an oil bath at 150°C for 3 hours to age the prepolymer.…”

Section: Prepolymer Synthesismentioning

confidence: 99%

Preparation and characterization of poly(2‐methyl‐1,5‐pentamethylene oxamide) (PM52) polymer

Mutua

Gao

Yang

et al. 2018

Polymers for Advanced Techs

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Poly(2‐methyl‐1,5‐pentaneoxamide) (PM52) with relative viscosity up to 3.3 were synthesized using 2‐methyl‐1,5‐pentanediamine (M52) and dibutyl oxalate via spray/melt polycondensation. The obtained polyoxamide was characterized by FTIR, 1H‐NMR, WAXD, DSC, and TGA. The Tm of PM52 was 200°C with a heat of fusion (ΔHf) of 59.7 J·g−1, crystallization temperature of 125°C, and a crystallization enthalpy (ΔHc) of 42.6 J·g−1. Isothermal crystallization studies revealed a 2‐dimensional crystallization phenomenon which didn't vary with change in crystallization temperature. TGA analysis revealed that the thermal stability of PM52 compared well with commercial PA6, and XRD studies revealed an α form of crystal structure and that the polymers possessed good crystallinity. Saturated water absorption of 4.6 wt% was recorded for the new polyoxamide synthesized as compared with 10.6 wt% for commercial PA6; such properties are good for applications in the food industry, plastics, and electronics industry where dimensional stability is a key requirement.

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Preparation and characterization of poly(m-xylylene oxamide) and its copolymer

Cited by 4 publications

References 24 publications

Synthesis and characterization of poly (1,6‐hexamethylene oxamide‐co‐m‐xylene oxamide) copolymers

Synthesis and characterization of poly (1,6‐hexamethylene oxamide‐co‐m‐xylene oxamide) copolymers

Visually and Infrared Transparent Poly(oxalamide) Films with Mechanical Toughness

Preparation and characterization of poly(2‐methyl‐1,5‐pentamethylene oxamide) (PM52) polymer

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