Segmental orientation of thermoplastic polyurethanes investigated by 1H double-quantum NMR. Correlation with thermodynamic and mechanical properties

Voda, Alexandra; Voda, M.A.; Beck, Klaus; Schauber, Thomas; Adler, Matthias; Dabisch, Thomas; Bescher, Martin; Viol, Michael; Demco, Dan E.; Blümich, Bernhard

doi:10.1016/j.polymer.2006.01.023

Cited by 13 publications

(19 citation statements)

References 18 publications

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“…The hard micro‐domain achieve the necessary mobility to reorganize into bigger domains and the shorter HS is allowed to dissolve in the soft phase, which consequently causing the increasing of the T g . The same observations about ageing and processing conditions that influence the microstructure of the polymer are well‐known and documented in the literature .…”

Section: Poly(carbonate‐urethane)smentioning

confidence: 54%

Thermoplastic polyurethanes derived from petrochemical or renewable resources: A comprehensive review

Datta

Kasprzyk

2017

Polymer Engineering & Sci

115

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Thermoplastic polyurethanes (TPUs) materials are obtained by the reaction of polyol (ether-, ester-, and carbonate-based diols with average molecular weight in the range from 1,000 to 3,000 g/mol) with aliphatic or aromatic diisocyanates. Synthesized materials consist of the hard and soft segments which are separated in different level. All mechanical and thermal properties of TPUs depend on the chemical structure of used monomers, volume fraction, and interaction between the hard and soft segments. Presented work is the review of the synthesis and the structure-properties relationship analysis in the case of TPU. The most popular reactants used for the production of the TPUs have petrochemical-based origin.

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Section: Poly(carbonate‐urethane)smentioning

confidence: 54%

Thermoplastic polyurethanes derived from petrochemical or renewable resources: A comprehensive review

Datta

Kasprzyk

2017

Polymer Engineering & Sci

115

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“…Os TPUs segmentados podem ser considerados copolímeros multiblocos do tipo (AB) n , onde A e B representam unidades repetitivas de segmentos macios e rígidos [2]. A incompatibilidade termodinâmica dos segmentos ocasiona a separação de microfases [3] devido à maior temperatura de fusão dos segmentos rígidos que os tornam incompatíveis com os macios.…”

Section: Introductionunclassified

Efeito da incorporação de talco nas características térmicas, mecânicas e dinâmico-mecânicas de poliuretanos termoplásticos

et al. 2011

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RESUMOO objetivo deste trabalho foi investigar o efeito da adição de talco, um agente nucleante amplamente empregado em formulações de termoplásticos em geral, no comportamento de cristalização e nas propriedades mecânicas de dois poliuretanos termoplásticos (TPUs) de diferentes massas molares. Foram realizadas análises de calorimetria exploratória diferencial (DSC), termogravimetria (TGA), dinâmico-mecânica (DMA), além de ensaios mecânicos. Observou-se que a adição de talco aumentou a temperatura de cristalização e a de decomposição média do TPU de maior massa molar média, no entanto, não foi observada mudança para concentrações superiores a 0,5% (m/m). Análises de DMA indicaram um aumento do módulo de armazenamento com a aditivação somente para o TPU de maior massa molar média. Nos ensaios mecânicos, não foi possível observar alterações significativas nas propriedades. O estudo realizado demonstrou a importância do conhecimento do efeito da adição de talco como agente nucleante em compostos de TPU, visando o melhoramento do desempenho destes materiais. Palavras -chave:Talco, poliuretano termoplástico, agente nucleante, cristalização.The effect of talc addition on the thermal, mechanical and dynamicmechanical characteristics of thermoplastic polyurethanes ABSTRACTThe aim of this work was to investigate the effect of adding talc, a nucleating agent widely used in general purpose thermoplastic formulations, on the crystallization behavior and the mechanical properties of two thermoplastic polyurethanes (TPUs) of different molecular weight. In this study, differential scanning calorimetry (DSC), thermogravimetry (TGA), dynamic-mechanical analysis (DMTA) and mechanical tests were employed. It was observed that the addition of talc increased the crystallization and the decomposition temperature of the highest average molecular weight TPU, although no change was observed at concentrations above 0.5 wt%. DMA analyses showed an increase in storage modulus only for the TPU with the highest average molecular weight. Mechanical testing did not show significant changes in the evaluated properties. The study demonstrated the importance of knowing the particular effects of adding talc as a nucleating agent in TPU compounds, aimed at improving their performance.Keywords: Talc, thermoplastic polyurethane, nucleating agent, crystallization. INTRODUÇÃOA necessidade de se produzir materiais com menor custo e maior disponibilidade no mercado tornou-se um dos grandes desafios para a indústria de componentes para calçados. No setor de laminados, por exemplo, é de grande importância o desenvolvimento de materiais com boas propriedades adesivas que aliem baixa temperatura de processamento e curto tempo de cristalização.O poliéster à base de caprolactona (PES) apresenta custo relativamente elevado e baixa disponibilidade no mercado, sendo prioritariamente utilizado para aplicações mais atraentes economicamente, como na área médica. Por estes motivos, é crescente o interesse em substituir o PES,

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“…In the past years, the microscopic properties of thermoplastic elastomers were investigated by solid-state NMR. − Litvinov et al investigated multiblock (poly(butylene terephthalate)- block -poly(tetramethylene oxide) (PTMO)) copolymers by 1 H and 13 C NMR relaxation experiments. They proved that at room temperature three different phases coexist, and the phase diagrams as well as the crystallinity of PBT were determined.…”

Section: Introductionmentioning

confidence: 99%

Morphology of Thermoplastic Polyurethanes by¹H Spin-Diffusion NMR

et al. 2006

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The morphology and domain sizes are reported for a series of thermoplastic polyurethane (TPU) samples with different content in hard segments and the same molecular weight of the soft segments. NMR spin-diffusion experiments were employed with a 1H double-quantum dipolar filter to establish the dominant dimensionality of the spin-diffusion process, which is shown to take place in two and three dimensions for investigated samples. The correlation between mesoscopic and microscopic properties of the TPU samples is discussed. To this purpose the effective volume of the hard domains is correlated with the TPU content of the hard segments and the segmental orientation of the hard segments obtained from the 1H residual dipolar couplings. A semiquantitative model is developed to explain the functional dependence of the residual second van Vleck moment on the effective volume of the hard segments.

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Segmental orientation of thermoplastic polyurethanes investigated by 1H double-quantum NMR. Correlation with thermodynamic and mechanical properties

Cited by 13 publications

References 18 publications

Thermoplastic polyurethanes derived from petrochemical or renewable resources: A comprehensive review

Thermoplastic polyurethanes derived from petrochemical or renewable resources: A comprehensive review

Efeito da incorporação de talco nas características térmicas, mecânicas e dinâmico-mecânicas de poliuretanos termoplásticos

Morphology of Thermoplastic Polyurethanes by¹H Spin-Diffusion NMR

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Segmental orientation of thermoplastic polyurethanes investigated by 1H double-quantum NMR. Correlation with thermodynamic and mechanical properties

Cited by 13 publications

References 18 publications

Thermoplastic polyurethanes derived from petrochemical or renewable resources: A comprehensive review

Thermoplastic polyurethanes derived from petrochemical or renewable resources: A comprehensive review

Efeito da incorporação de talco nas características térmicas, mecânicas e dinâmico-mecânicas de poliuretanos termoplásticos

Morphology of Thermoplastic Polyurethanes by1H Spin-Diffusion NMR

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Morphology of Thermoplastic Polyurethanes by¹H Spin-Diffusion NMR