Effect of the composition ratio of copolymerized poly(carbonate) glycol on the microphase‐separated structures and mechanical properties of polyurethane elastomers

Kojio, Ken; Nonaka, Yoshiteru; Masubuchi, Tetsuo; Furukawa, Mutsuhisa

doi:10.1002/polb.20303

Cited by 64 publications

(68 citation statements)

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“…I(C=O free )/I(C=O) of both PU films at 74 exhibited larger magnitude in comparison with that at 10 . The electric field vector of incident infrared beam is almost perpendicular to the film surface at 74 and the transition moment of the carbonyl stretching band is perpendicular to the molecular axis.…”

Section: Thin Filmsmentioning

confidence: 87%

“…There has been reported some factors to control the microphaseseparated structure. A polymerization method, 13 thermal treatment 3,14 and chemical structures of raw materials including molecular weight [6][7][8][9][10][11][12]15,16 can be given as examples. First, by changing the polymerization method, one can control the primary structure of the PUs.…”

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confidence: 99%

“…To form the microphaseseparated structure in polymers, they need to possess block structures, which are chemically connected each other. It is well-known that the polyurethane elastomers (PUEs), which possess the multiblock structure, show the microphase-separated structure, 1-6 resulting in giving some unique properties, such as mechanical and adhesive properties [6][7][8][9][10][11][12][13][14][15][16] and biocompatibility.17 …”

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confidence: 99%

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The Microphase-separated Structure of Polyurethane Bulk and Thin Films

et al. 2009

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The microphase-separated structure of polyurethane bulk and thin films were investigated using atomic force microscopy (AFM). The polyurethane (PUs) were synthesized with poly(oxytetramethylene) glycol (PTMG), 4,4 0 -diphenylmethane diisocyanate (MDI) and 1,4-butanediol (BD) by a prepolymer method. The hard segment contents were 34 and 45 wt %. Polarized optical microscopy (POM) revealed that the 34 wt % PUE is homogeneous at a macroscopic level, while the 45 wt % one is macrophase-separated into two phases. One phase forms spherulites of ca. 2-5 mm in diameter. AFM observation for the 34 wt % PUE showed the microphase-separated structure, consisting of hard segment domains and a soft segment matrix. In contrast, for the 45 wt % PUE, a lot of the hard segment domains were observed in the spherulite region, indicating that spherulites include much amount of hard segment component, in contrast, outside of spherulite exhibited similar structure to that of 34 wt % one. For the PU bulk, the different microphase-separated structure in the inside and outside of spherulite was successfully observed for the first time. Also, the microphase-separated structure of PU films was investigated as a function of the film thickness. The PU films exhibited similar microphase-separated structure. For the thicker film ($200 nm), the interdomain spacing almost corresponded to bulk one. On the other hand, that for the film thickness below 7 nm dramatically decreased. This seems to be simply related to a decreasing space. We obtained the experimental data, which the phase-separated domain size of multiblock copolymer decreased with decreasing film thickness.KEY WORDS: Polyurethane / Microphase-separated Structure / Atomic Force Microscopy / Thin Film / A microphase-separated structure formed in polymers plays a quite important role for their properties, such as electric, adsorption, mechanical properties. To form the microphaseseparated structure in polymers, they need to possess block structures, which are chemically connected each other. It is well-known that the polyurethane elastomers (PUEs), which possess the multiblock structure, show the microphase-separated structure, 1-6 resulting in giving some unique properties, such as mechanical and adhesive properties [6][7][8][9][10][11][12][13][14][15][16] and biocompatibility.17

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Section: Thin Filmsmentioning

confidence: 87%

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confidence: 99%

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confidence: 99%

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The Microphase-separated Structure of Polyurethane Bulk and Thin Films

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“…The polycarbonate based thermoplastic polyurethanes (CPUs) are becoming popular these days due the excellent resistance to heat, hydrolysis and ultraviolet radiation in comparison with the ether series. 14 In this study, the polycarbonate based thermoplastic polyurethane (CPU2) adduct was prepared and thin film coated onto the PA 6 fibers, the performance of the same was characterized by various methods. Figure 1 shows the raw materials used for the study.…”

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confidence: 99%

High Performance Polyamide 6 Fibers Using Polycarbonate Based Thermoplastic Polyurethane Thin Film Coatings- a Novel Method

2009

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Polycarbonate based thermoplastic polyurethanes (CPU2) were prepared and coated onto polyamide 6 (PA 6) fibers. The CPU2 thin film coatings were prepared by dipping the PA 6 fibers into a viscous CPU2 adduct and cured at 100 C for 12 h. Both the tensile strength and the elongation at break of the CPU2 thin film coated PA 6 fibers (CPU2-PA6) increased although both the magnitudes of CPU2 are much lower than for the original PA 6 fibers. FE-SEM observation revealed that there existed an interface interaction region of 10 mm at the interface of PA 6 fiber and the CPU2 thin film coating. Generally speaking, it is considered that the break of PA 6 fibers is due to the formation of the micro-cracks on the fiber surface when it is under a tensile load. The coating of CPU2 onto the PA 6 fibers reduced the formation of micro-cracks during the elongation process, resulted in the improvement of the mechanical properties. Also, the CPU2-PA6 fibers when exposed to weathering tests to check the weathering resistance, showed an increase in the tensile strength for 0-50 h of exposure. This was due to the UV light induced crystalline transformation, i.e., from the crystalline phase to the crystalline phase. The CPU2-PA6 fibers almost retained the strength even after 200 h of exposure in a weatherometer. The crystalline transformations due to the UV irradiations have not been reported yet. Also, the CPU2 showed good adhesion property with the PA 6 films. The blending with various polymers or composites is generally employed for the performance enhancement of PA 6 fibers. On the contrary, the method employed in this study improved the performance of PA 6 fibers without changing its inherent morphological properties.KEY WORDS: Polyamide 6 Fiber / Polyurethane Thin Film / Coating / Micro-cracks / Interface Interaction / Plastic-type Break / Metallic-type Break / Weathering Tests / Polyamide fibers (PAs) are used for a wide variety of applications. They include the textile industry, engineering applications, biomedical and marine applications. The properties of PAs are the high melting point, good mechanical strength, good resistance to hydrocarbons, and the ease of fabrication and processing.1-3 However, the polyamide 6 (PA 6) fibers are prone to break under the mechanical stress due to the formation of micro-cracks on the surface. While, the polyurethanes are widely used in the coatings, adhesives, sealants, foams, elastomers and so on. Thermoplastic polyurethane elastomers are well known for their abrasion resistance, flexibility and high cohesive strength. [4][5][6] They are synthesized from the polymer glycol, diisocyanate and a chain extender. The final structure of polyurethane consists of a soft segment formed from the polymer glycol and a hard segment from the diisocyanate and the chain extender. The soft segment can be classified as an ether or ester series, including the carbonate ones. 7,8 Studies have been reported with polyamide in the thermoplastic elastomers or rubbers as blends. 9 The PA 6/acrylonitrile-butadiene-sty...

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“…Polyether and polyester macrodiols are commonly used in a wide range of commercial applications due to their affordable price. In contrast, polycarbonatediol (PCD) derived TPUs depict improved water and organic solvent resistance, high mechanical strength and high heat-resistance, at the expense of an increase in the price Kojio, et al, 2004;Tanaka, et al, 2002). Due to their inherent properties they are used for specific applications as artificial and synthetic leathers, thermoplastics, elastomers, paints and adhesives, where high reliability is required.…”

Section: Introductionmentioning

confidence: 99%

A contribution to the study of the molecular mobility in polymeric materials by Thermal and Dielectric Analysis

Foj¹,

Belén²

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T h e s i s S u p e r v i s o r : P R O F . D r . M a r í a J e s ú s S a n c h i s S á n c h e z t o o b t a i n t h e d e g r e e o f D o c t o r o f P h i l o s o p h y a t t h e U n i v e r s i t a t P o l i t è c n i c a d e V a l è n c i a Prof. Dr. María Jesús Sanchis SánchezThe work presented in this thesis was carried out at the Universitat Politècnica de València and was financially supported by the Spanish Ministry of Economy and Competitiveness (Projects Nos. MAT2008-06725-C03-03 and MAT2012-33483)."Cuando quieres algo, todo el Universo conspira para que ACKNOWLEDGEMENTSTras estos años de trabajo, llega el momento de mostrar mi agradecimiento a todas las personas que me han acompañado y apoyado durante el desarrollo de mi tesis doctoral.En primer lugar, me gustaría expresar mi gratitud a mi directora de tesis María J.Sanchis por su inestimable ayuda durante todos estos años. Muchas gracias por confiar en mí, por darme esta oportunidad y por las incalculables horas invertidas tanto para el desarrollo de esta tesis como al mío propio.También me gustaría agradecer a mis estimadas compañeras Marta Carsí y Pilar Ortiz su ayuda y amistad en este largo recorrido que suponer realizar una tesis doctoral. He aprendido mucho de vosotras tanto científica como personalmente. En este punto, no puedo olvidarme de mi querida Aurora Alonso, que pese a no formar parte de nuestro grupo de investigación, me ha apoyado, aconsejado y dado su amistad durante todos estos años.Quiero mostrar mi agradecimiento a los profesores José M. García y Félix C. García ABSTRACTThe development of new and more complex polymeric materials involves challenging problems to basic sciences. The relationship between structure and molecular dynamics assumes great importance for the future development of novel technologies based on such polymers. Thus, the understanding of how small changes in the chemical structure affect the properties of the material is essential to progress in the technological and scientific area. An in-depth analysis of the molecular mobility leads to establish the structure-properties relationships. On this basis, the main aim of the present work is to study the molecular mobility of two different families of polymeric materials. For this purpose, the experimental techniques mainly used were Differential Scanning Calorimetry (DSC) and Dielectric Relaxation Spectroscopy (DRS) (Chapter 3).The first family of polymers characterized was a series of chemically cross-linked copolymers composed by Vinylpyrrolidone (VP) and Butyl Acrylate (BA) monomers. The study was divided in two parts, which are collected in Chapter 4 and 5.In the first place, Chapter 4 contains the influence of the monomer molar ratio (XVP/YBA) on the copolymer properties. Thus, a Fourier Transform Infrared Spectroscopy (FTIR) analysis verified dipole-dipole interactions between amide groups. The influence of these interactions on several parameters related to the molecular mobility was evidenced by the DSC, DRS and Dynamic Mechanical Analysis (DMA) techni...

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Effect of the composition ratio of copolymerized poly(carbonate) glycol on the microphase‐separated structures and mechanical properties of polyurethane elastomers

Cited by 64 publications

References 10 publications

The Microphase-separated Structure of Polyurethane Bulk and Thin Films

The Microphase-separated Structure of Polyurethane Bulk and Thin Films

High Performance Polyamide 6 Fibers Using Polycarbonate Based Thermoplastic Polyurethane Thin Film Coatings- a Novel Method

A contribution to the study of the molecular mobility in polymeric materials by Thermal and Dielectric Analysis

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