Synthesis and properties of segmented polyurethanes with triptycene units in the hard segment

Chang, Zhengmian; Zhang, Mingqiang; Hudson, Amanda G.; Orler, E. Bruce; Moore, Robert B.; Wilkes, Garth L.; Turner, S. Richard

doi:10.1016/j.polymer.2013.10.028

Cited by 38 publications

(29 citation statements)

References 39 publications

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“…Foams represent one of the most important commercial products of PU [4]. These foams are commonly classified as rigid, semi-rigid, or flexible, which depend on their mechanical performance and core densities [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of bio-castor oil polyurethane flexible foams and the influence of biotic component on their performance

et al. 2015

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A series of bio-based polyurethane flexible foams were synthesized by substituting polyether polyol with castor oil and polyethylene glycol (PEG). The influence of the castor oil component in the prepolymers on the structure and properties of the castor oil-based polyurethane flexible foams were investigated and compared. FTIR (Fourier transform infrared spectroscopy) results confirmed that bio-based polyurethane was successfully synthesized by castor oil, PEG and MDI (diphenyl methane diisocyanate), and its urethane group content decreased as the castor oil content increased from 40 to 60 wt.%. TG (thermogravimetry) and DTG (derivative thermogravimetry) results showed that the thermal degradation of the bio-based polyurethane flexible foams occurred at about 150, 320 and 420°C. The Young's modulus improved from 0.196 to 1.235 KPa and the compression resilience improved from 97.76 to 99.65 % with increased content of castor oil. Moreover, these bio-based foams exhibited lower water absorption and higher contact angle with increased castor oil content.

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Section: Introductionmentioning

confidence: 99%

Synthesis of bio-castor oil polyurethane flexible foams and the influence of biotic component on their performance

et al. 2015

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“…It is recalled from the earlier discussion regarding the strong intermolecular interactions between hard segments and soft segments which resulted in the phase mixing. The similar stressstrain curve has appeared in the polyurethane prepared from MDI-TD-PTMO which displayed microphase mixing behavior, but the reason was unexplained [27]. Meanwhile, PTMO/HQEE-L showed high elongation during the entire stretching process to gain an excellent elongation up to 2400 %.…”

Section: Mechanical Properties Of Polyurethanesmentioning

confidence: 55%

“…They contributed the better phase separation to the incompatibility between aromatic structure and polydiol. Zhengmian Chang et al synthesized polyurethane with triptycene units as new chain extender [27]. Polyurethanes containing triptycene units exhibited lower tensile strength and modulus compared to HQEE analogs, which induced by poor phase separation for the presence of triptycene structures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of segmented polyurethanes with hydroquinone ether derivatives as chain extender

Liu

Wang

et al. 2015

J Polym Res

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Two series of 4, 4′-diphenylmethane diisocyanate (MDI) type polyurethanes based on poly(tetramethyleneoxide) glycol (PTMO) and polybutylene adipate glycol (PBA) as soft segments were synthesized by one-step bulk polymerization process. Various hard segments were obtained from hydroquinone ether derivatives with or without ether oxygen structure bonded with the aromatic units in main chain, including hydroquinone (HQE), hydroquinone bis(b-hydroxyethy) ether (HQEE), and 4-hydroxyethyl ethyl oxygen-1-hydroxy ethyl benzene ether (HQEE-L) as chain extenders. The effect of chain extender structure on aggregation structure, thermal and mechanical properties was studied. ATR-FTIR suggested that hydrogen bonding interactions were significantly changed in the presence of flexible ether oxygen structure in hard segment. HQEE-based polyurethanes and HQEE-L-based polyurethanes displayed microphase separation and microphase mixing behavior respectively based on DMA and DSC results. XRD curves confirmed that flexible ether oxygen chain bonded with the rigid aromatic units played a balancing role in the steric effect caused by aromatic chain extender. Thermal properties of polyurethanes were affected mainly by the hard segment packing while mechanical properties were influenced by both phase separation and phase mixing which possess strong hydrogen bonding interactions. The excellent elongation in PTMO/HQEE-L and the high ultimate tensile strength in PBA/HQEE-L can be attributed to the phase mixing with strong hydrogen bonding interactions presented in HQEE-Lbased polyurethanes.

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“…It is generally accepted that the thermal degradation process in polyurethanes is a twostage or three-stage decomposition, which mainly depends on the chemical structure, and the composition of polyols, diisocyanates, and chain extenders 7,8 . The three synthetized polyurethanes display typical two-stage degradation.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

Synthesis and characterization of shape memory polyurethanes

Sáenz-Pérez

Laza

León

et al. 2015

Proceedings of MOL2NET, International Conference on Multidisciplinary Sciences

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Shape memory polymers (SMPs) have attracted extensive attention from basic and fundamental research to industrial and practical applications because they have emerged as a cheap and efficient alternative to well-known metallic shape-memory alloys. Among them, shape memory polyurethanes (SMPUs) own different applications such as the textile finishing, adhesives, coatings, automotive, furniture, construction, and thermal insulation and footwear industries, due to it can be synthesized with different types of molecular architectures by manipulating their composition and choosing properly the chemical structure of their components. In this work, the synthesis and characterization of shape memory polyurethanes, based on two-step polymerization, is reported. The hard segment of SMPU was composed of diisocyanate and a chain extender. On the other hand, the soft segment was prepared by polyols with different molecular weights. Depending on the structure of the synthetized polyurethanes, the materials presented different properties. Thermal characterization was performed by means of Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). Furthermore, mechanical properties and shape memory effect were also determined by Dynamic Mechanical Analysis (DMA) and Thermo-Mechanical Analysis (TMA).

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Synthesis and properties of segmented polyurethanes with triptycene units in the hard segment

Cited by 38 publications

References 39 publications

Synthesis of bio-castor oil polyurethane flexible foams and the influence of biotic component on their performance

Synthesis of bio-castor oil polyurethane flexible foams and the influence of biotic component on their performance

Synthesis and properties of segmented polyurethanes with hydroquinone ether derivatives as chain extender

Synthesis and characterization of shape memory polyurethanes

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