The design, synthesis and characterization of polyurethane with super macromolecular size

Li, Fangxing; Zuo, Jian‐Min; Song, Dahai; Li, Yuting; Ding, Lin; An, Yingli; Wei, Ping; Ma, Jianbiao; He, Binglin

doi:10.1016/s0014-3057(00)00082-3

Cited by 10 publications

(10 citation statements)

References 6 publications

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“…We assume that this kind of macromolecules tends to form different mechanical aggregates in solution and that the formation and dissociation of molecular clusters is in a non-equilibrium state, which could be a unique solution behavior of cross-linked macro-SOLUTION PROPERTIES OF POLYURETHANES 541 molecules. The literature data confirm this assumption [15,16]. Moreover, the synthesis process can develop the intermolecular and intramolecular crosslinked structures.…”

Section: Solution Behavior Of Poly(ether Urethane)smentioning

confidence: 57%

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Influence of Ester and Ether Groups on Solution Properties of Polyurethanes

Ioan¹,

Lupu²,

Macocinschi³

2005

High Performance Polymers

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Viscometric data in non-theta solvent were utilized for determination of the poly(ester-urethane)s and poly(ether urethane)s conformational transitions and of the unperturbed dimensions. The influence of soft and hard segments was observed for poly(ester-urethane)s. The samples with 2,4-tolylene diisocyanate in hard segments have smaller unperturbed dimensions compared with the samples containing 4,4′-methylene diphenylene diisocyanate, which are believed to possess significant chain rigidity. The crosslinking tendency in synthesis of polyurethanes with ether groups - by reaction of chain end -NCO in prepolymer with the hydrogen from -NHCOO-groups - and in solutions explains the anomalies observed in solution properties.

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Section: Solution Behavior Of Poly(ether Urethane)smentioning

confidence: 57%

“…For the poly(ether urethane)s studied herein, the reactions in the system are presented below according to literature data [15,16].…”

Section: Solution Behavior Of Poly(ether Urethane)smentioning

confidence: 99%

Influence of Ester and Ether Groups on Solution Properties of Polyurethanes

Ioan¹,

Lupu²,

Macocinschi³

2005

High Performance Polymers

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“…However, partially cross-linked material is formed from 11c-e but not from 11a at 125 8C, which became evident from the partial insolubility of the material in formic acid. It is likely that cross-linking occurs involving the NH of a urethane or urea group of the polymer, a feature which was used by Li et al to synthesize soluble crosslinked polyurethane macromolecules [13,14]. SEC analysis of the purified products in hot DMAc and, if necessary, filtration of parts of insoluble material, shows bimodal elution curves for 14c-e (2:26!…”

Section: Resultsmentioning

confidence: 99%

Novel intramolecular blocked isocyanates as stable one-component systems for poly(urea urethane)s

Ubaghs

Keul

Höcker

2005

Polymer

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“…In the second method, polyurethane is compounded with the inorganic fillers (e.g., carbon nanotubes (CNTs) that have attracted much attention due to its excellent properties and capabilities) . Polyurethanes due to the presence of the soft and hard segments in their structures have attracted the remarkable importance in engineering, and exhibit many attractive properties, e.g., adjustable mechanical strength, good chemical resistance and potential shape‐memory .…”

Section: Introductionmentioning

confidence: 99%

The effect of multiwalled carbon nanotube and crosslinking degree on creep–recovery behavior of PET waste originated‐polyurethanes and their nanocomposites

et al. 2017

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The polyester diol obtained from the glycolysis of the recycled PET flakes was used to synthesize the polyurethanes of PU‐1, PU‐1.7, and PU‐2 that the numbers indicate the isocyanate to hydroxyl groups (NCO/OH) molar ratios. The nanocomposites of PUs with hydroxylated multiwalled carbon nanotube (MWCNT) (PUCNT‐1.7 and PUCNT‐2) were synthesized via in situ polymerization, while the PUCNT‐1 was not synthesized due to the steric hinderance effect of MWCNT. It was shown that the NCO/OH molar ratios and the added MWCNT govern the crosslink degree of the samples. Because, the good creep–recovery behavior of the under‐loaded polymers in long time applications has remarkable importance for polymer engineers, the creep–recovery behavior of PUs and their nanocomposites was studied by dynamic mechanical analysis (DMA). Nevertheless, there has been no report on the creep–recovery behavior of these PET originated polyurethanes. The well‐known models of Power law and Burgers (for fitting the creep experimental data), and Weibull model (for fitting the recovery experimental data) showed the good agreements with the empirical data. The creep strain of the samples was in the order PU‐1 > PUCNT‐1.7 > PU‐2 > PU‐1.7 > PUCNT‐2. It was found that the crosslink‐degree of the samples and also the opposing effects of MWCNT (the reinforcing and hindrance effects) are the important parameters that govern Young modulus, creep, and recovery of the samples. PU‐1.7 due to its higher crosslink‐degree showed the lower creep–recovery strain in comparison to PU‐2 and PU‐1. The lower creep–recovery strain of PUCNT‐2 as compared to other samples can be attributed to the dominant reinforcing effect of MWCNT in this sample, whereas the high creep–recovery strain of PUCNT‐1.7 was assigned to the dominant hindrance effect of MWCNT. POLYM. COMPOS., 39:E1013–E1024, 2018. © 2017 Society of Plastics Engineers

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The design, synthesis and characterization of polyurethane with super macromolecular size

Cited by 10 publications

References 6 publications

Influence of Ester and Ether Groups on Solution Properties of Polyurethanes

Influence of Ester and Ether Groups on Solution Properties of Polyurethanes

Novel intramolecular blocked isocyanates as stable one-component systems for poly(urea urethane)s

The effect of multiwalled carbon nanotube and crosslinking degree on creep–recovery behavior of PET waste originated‐polyurethanes and their nanocomposites

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