Star polymers formed by MPEG reaction with diepoxides. The course of reaction

Łapienis, Grzegorz; Szymański, Ryszard; Penczek, Stanisław

doi:10.1016/j.polymer.2015.07.004

Cited by 7 publications

(4 citation statements)

References 57 publications

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“…The system was calibrated by poly(ethylene oxide)s standards. The number average molecular weight (M n ) and weight average molecular weight (M w ) were calculated by means of OmniSEC software (Viscotek) (Lapienis et al 2015).…”

Section: Size-exclusion Chromatographymentioning

confidence: 99%

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

2017

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The linear dynamic viscoelastic properties and non-linear transient rheology of sodium carboxymethylcellulose solutions (Na-CMC) in propylene glycol/water mixtures were investigated. Measurements were carried out for the solutions of Na-CMC with three different degrees of substitution (DS), namely 0.62, 0.79, 1.04, and the similar average molecular weight (M w & 250,000 g/mol). The strong synergism between the molecules of Na-CMC with DS of 0.62 and 0.79, and propylene glycol has been observed. The occurrence of the overshoot shear stress and the low loss tangent values indicate the physical cross-linking of the polymer chains. The increase of propylene glycol concentration over 80 wt% and sodium carboxymethylcellulose (DS = 0.7) over 1.6 wt% leads to the formation of a physical cross-link network. The absence of overshoot shear stress and terminal behaviour in SAOS flow of the Na-CMC 1.04 solutions in the PG/water mixture shows that no intermolecular cross-linking of polymer chains occurred in them.

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Section: Size-exclusion Chromatographymentioning

confidence: 99%

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

2017

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“…c′ at 6.5−6.7 ppm disappeared and two new proton signals assigned to −CH and −CH 2 at the end group connected to the trifluoroacetate appeared at 5.1−5.4 and 4.5 ppm, verifying this 42. To have a clear assignment of overlap peaks, HSQC (Figure 4) was applied to recognize broad signals in the 1 H NMR spectra.…”

mentioning

confidence: 64%

“…The signal at 6.5–6.7 ppm is ascribed to the aromatic protons of H d at the ortho-position of –NH, and the proton signals at 6.9–7.2 ppm can be attributed to the aromatic proton of H b and H c at the meta-position of –NH and H b″ , H c″ , and H d′ at the ortho- and meta-positions of –N. Moreover, titration experiment of aminic polyols using trifluoroacetic anhydride (TFAA) indicates that –NH is reacted with TFAA and the CO 2 -polyol is mainly capped by the 2° −OH (1° −OH/2° −OH = ( A 4.5 /2)/ A 5.1–5.4 = 0.12, Figure S13b), as the signals of H c′ at 6.5–6.7 ppm disappeared and two new proton signals assigned to −CH and −CH 2 at the end group connected to the trifluoroacetate appeared at 5.1–5.4 and 4.5 ppm, verifying this . To have a clear assignment of overlap peaks, HSQC (Figure ) was applied to recognize broad signals in the 1 H NMR spectra.…”

Section: Resultsmentioning

confidence: 99%

Construction of Ultralow-Molecular-Weight CO₂–Polyols with Self-Catalytic Performance in Polyurethane Preparation

Dong,

Zhou,

Zhang

et al. 2024

Macromolecules

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An aminic CO 2 -based poly(ether-carbonate) polyol has been successfully synthesized by CO 2 /propylene oxide copolymerization with the primary aromatic amine as the initiator under a double metal cyanide (DMC) complex catalyst. The weak basicity and coordination ability of amine initiators are conducive to enhancing the copolymerization productivity and catalytic activity. A branched aminic CO 2 -polyol has been constructed with catalytic efficiency up to 4.1 kg g −1 DMC using the diamine of 4,4′-methylene-bis(2-chloroaniline) as the initiator, whose average −OH functionality can be facilely tuned in the range of 2.4−3.6. The evolution of the number and length of multiarm polymers was investigated by nuclear magnetic resonance (NMR) and electrospray ionization-mass spectrometry (ESI-MS) analyses. A plausible mechanism of DMC catalyst-mediated copolymerization has also been proposed. Interestingly, the obtained low-molecular-weight (MW) aminic CO 2 -polyols displayed an intrinsic self-catalytic feature that is suitable for the preparation of rigid polyurethane foams without any external catalyst. This work demonstrates an efficient pathway to fix CO 2 into much more environmentally friendly polyols with low-volatility organic compounds.

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“…However, if the wearing person of a fabric changes, the cloth may quickly adapt to the new wearer's shape without the need for tension. Some of the investigations 3 Journal of Nanomaterials pitch [17,18]. The essential goal of this work stayed makes shape memory polymers utilizing thermoset-based epoxy resin.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on Fabrication and Thermal Characterization of Shape Memory Polymer Composites with Nanofillers

Alshgari

Wabaidur

Parthasarathy

et al. 2022

Journal of Nanomaterials

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Shape memory polymers (SMP) have piqued the interest of the research and development sector due to their new features and immense potential. The polymer matrix epoxy was changed using varied weight percentages of aliphatic monomer-neopentyl glycol diglycidyl ether (NGDE), and the optimal weight percentage of NGDE was identified. The weight percentages of NGDE-CNT are 0, 0.3, 0.6, 0.9, 1.2, and 1.5. The use of nanofillers such as carbon nanotubes (CNT) has been promoted to improve the heat conductivity of composites. The thermal conductivity of shape memory polymers has been enhanced through the addition of varying quantities of CNT filler. Mechanical characterizations such as tensile testing, Young’s modulus, impact strength, and heat related tests such as form recovery testing, shape fixity, and recovery time were also investigated. From the investigational outcomes, optimal weight percentage of NGDE loading into epoxy is 15%, and maximum tensile strength attains at 1.2 wt. percent of CNT.

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Star polymers formed by MPEG reaction with diepoxides. The course of reaction

Cited by 7 publications

References 57 publications

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

Construction of Ultralow-Molecular-Weight CO₂–Polyols with Self-Catalytic Performance in Polyurethane Preparation

Experimental Studies on Fabrication and Thermal Characterization of Shape Memory Polymer Composites with Nanofillers

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Star polymers formed by MPEG reaction with diepoxides. The course of reaction

Cited by 7 publications

References 57 publications

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

Construction of Ultralow-Molecular-Weight CO2–Polyols with Self-Catalytic Performance in Polyurethane Preparation

Experimental Studies on Fabrication and Thermal Characterization of Shape Memory Polymer Composites with Nanofillers

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Construction of Ultralow-Molecular-Weight CO₂–Polyols with Self-Catalytic Performance in Polyurethane Preparation