Amine-Terminated Polyether Resins in Rim

Dominguez, R.J.G.

doi:10.1177/0021955x8402000606

Cited by 15 publications

(3 citation statements)

References 4 publications

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“…Urethaneureas have better demolding behavior and superior high temperature properties compared to urethanes. The next step in the evolution of RIM may be a polymer with only urea linkages, achieved by using amine terminated polyols (4)(5)(6)(7)(8). The all urea system reacts extremely fast, eliminating the need for catalyst.…”

Section: Introductionmentioning

confidence: 99%

Properties and phase separation of reaction injection molded and solution polymerized polyureas as a function of hard block content

Willkomm¹,

Chen²,

Macosko³

et al. 1988

Polymer Engineering & Sci

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A series of amine terminated polypropylene oxide based thermoplastic polyureas with hard segment contents of 30%. 50%, and 70 percent were synthesized via solution polymerization and reaction injection molding (RIM). Amine terminated polypropylene oxide (PPO-NH2) of M, = 2000 was used as the soft segment and 4.4'-diphenylmethanediisocyanate (MDI) extended with diethyltoluenediamine (DETDA) a s the hard segment. These polyureas are linear, amorphous, and phase separated. Polymers were characterized by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), dynamic mechanical spectroscopy (DMS), small angle X-ray scattering (SAXS), and tensile testing. RIM polyureas had significantly lower molecular weights than solution polymerized polyureas. but their mechanical properties did not suffer. RIM polyureas have poorer phase separation than solution polyureas as evidenced by DSC, DMS, and SAXS, especially a t high hard segment levels. SAXS shows phase separation levels of up to 100 percent for low hard segment polyureas and down to 10 percent for high hard segment RIM polyurea. DSC found no evidence of a hard segment glass transition, and the evidence from DMS was inconclusive. In addition to polymer characterization, demolding behavior was studied. The 30 percent hard segment was always tough and elastomeric, while the 70 percent hard segment was always very brittle. The 50 percent hard segment showed the greatest variation in properties, ranging from very brittle to very tough as mold temperature and in-mold time were increased. Demold brittleness is explained by the presence of low molecular weight DETDA/MDI oligomers on demolding, which continue to react on aging.

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Section: Introductionmentioning

confidence: 99%

Properties and phase separation of reaction injection molded and solution polymerized polyureas as a function of hard block content

Willkomm¹,

Chen²,

Macosko³

et al. 1988

Polymer Engineering & Sci

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“…Reaction injection molding (RIM) [59] is a widely employed operating method in the industry of a wide broad of segmented block copolymers such as copolyurethanes [60], copoly(urethane-urea)s [61,62], copolyureas [63][64][65] and copoly (ether-amide)s to generate complex polymer elements in a fast and malleable processing routine. The polymer reaction by RIM comprises concomitantly phase separation, crystallization and cross-linking of the copolymer obtained as a kinetic competition that defined the development of the final structure [66].…”

Section: On-line Chemistrymentioning

confidence: 99%

Polymer research and synchrotron radiation perspectives

Portale¹,

Hermida‐Merino

Bras

2016

European Polymer Journal

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“…2 Bulk synthesis of block copolyurea is performed by reacting a liquid polyisocyanate with a mixture of an amine functionalized polyether and an aromatic diamine. 3 The polyurea thus formed consists of variable rigid and soft segments which can be tailored for specific applications. Within this context, it is highly desirable to obtain detailed knowledge of the molecular weight distribution, chemical composition distribution, and end group composition of the polyoxyalkeneamines, as these entities influence the elasticity and viscoelasticity of the polyurea end-product.…”

Section: Introductionmentioning

confidence: 99%

Structural Analysis of Polyoxyalkyleneamines by Matrix-Assisted Laser Desorption/Ionization on an External Ion Source FT-ICR-MS and NMR

Hage¹,

Duursma²,

Heeren³

et al. 1997

Macromolecules

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Matrix-assisted laser desorption/ionization (MALDI) and Fourier-transform ion cyclotron mass spectrometry (FT-ICR-MS) are combined for the characterization of polyoxyalkyleneamines. 1H and 13C NMR data are used to confirm and quantify structural assignments. Characterization of the molecular weight distribution, chemical composition distribution, and end group distribution of amine-terminated (co-)polymers of ethylene oxide and propylene oxide is rather complex because the convolution of these three entities yields an ensemble of structurally related molecules which is hard to characterize by conventional analytical techniques. In this study MALDI FT-ICR-MS is used to resolve intact, Na+ cationized, oligomer ions in the mass range from m/z 500 to 3500. This revealed the presence of various compositional distributions in the polyoxyalkyleneamines. The individual compound masses in the molecular weight distributions were measured with a mass accuracy of <20 millimass units, allowing end group and repeat unit determination with an accuracy of better than 50 millimass units. NMR is used to measure the average end group distribution to provide insight in conformational differences. In this respect, FT-ICR-MS data and NMR data are complementary. The combined results yield detailed information about chemical composition distributions of polyoxyalkyleneamines that hitherto it was not possible to obtain with either technique separately.

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Amine-Terminated Polyether Resins in Rim

Cited by 15 publications

References 4 publications

Properties and phase separation of reaction injection molded and solution polymerized polyureas as a function of hard block content

Properties and phase separation of reaction injection molded and solution polymerized polyureas as a function of hard block content

Polymer research and synchrotron radiation perspectives

Structural Analysis of Polyoxyalkyleneamines by Matrix-Assisted Laser Desorption/Ionization on an External Ion Source FT-ICR-MS and NMR

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