• Title/Summary/Keyword: Thermoplastic polyurethane

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Thermoplastic Polyurethane (TPU)/Ethylene-Propylene-Diene Monomer Rubber (EPDM) and TPU/Polybutadiene Rubber (BR) Blends for the Application of Footwear Outsole Materials (신발겉창 재료용 열가소성 폴리우레탄 (TPU)/에틸렌-프로필렌-디엔 고무와 TPU/부타디엔 고무 블렌드)

  • Kim, Ji-Hoo;Kim, Gue-Hyun
    • Elastomers and Composites
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    • v.48 no.3
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    • pp.195-200
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    • 2013
  • The main objective of this study is to improve abrasion resistance and wet slip resistance of thermoplastic polyurethane (TPU) by blending with ethylene-propylene-diene monomer rubber (EPDM) or polybutadiene rubber (BR) for the application of the footwear outsole materials. With addition of 10 wt% of EPDM or BR, TPU/EPDM and TPU/BR blends exhibited higher NBS abrasion resistance, tensile properties and wet slip resistance than TPU. However, with further increasing content of EPDM and BR, abrasion resistance and tensile properties of the blends decreased. Improvement in abrasion resistance and tensile properties with 10 wt% of addition of EPDM or BR may be due to better microphase separation of TPU.

A Study on Friction-induced Surface Fracture Behaviors of Thermoplastic Polyurethane (TPU)/Rubber Blends (열가소성 폴리우레탄 (TPU)/고무 블렌드의 마찰에 의한 표면 파괴 거동)

  • Jeon, Jun-Ha;Park, Sang-Min;Um, Gi-Yong;Bea, Jong-Woo
    • Journal of Adhesion and Interface
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    • v.14 no.3
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    • pp.121-127
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    • 2013
  • In this work, the thermoplastic polyurethane (TPU) was melt-blended with EPDM, NBR and BR to form TPU/Rubber blend films, their composition and friction-induced surface fracture relationship was investigated. TPU/EPDM and TPU/BR blends exhibited the improved friction-induced surface fracture, especially the effect of BR was excellent. With addition of more than 10 wt% BR, TPU/BR blends exhibited the improved friction-induced surface fracture. The increase of the soft segment with increasing BR content, which was confirmed by scanning electron microscopy (SEM) analysis enabled us to estimate the improved friction-induced surface fracture.

Synthesis and Properties of Bio-Thermoplastic Polyurethanes with Different Isocyanate Contents

  • Li, Xiang Xu;Sohn, Mi Hyun;Cho, Ur Ryong
    • Elastomers and Composites
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    • v.54 no.3
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    • pp.225-231
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    • 2019
  • Bio-based polyester polyol was synthesized via esterification between azelaic acid and isosorbide. After esterification, bio-based polyurethanes were synthesized using polyester polyol, 1,3-propanediol as the chain extender, and 4,4'-diphenylmethane diisocyanate, in mixing ratios of 1:1:1.5, 1:1:1.8, 1:1:2, and 1:1:2.3. The bio TPU (Thermoplastic Polyurethane) samples were characterized by using FT-IR (Fourier Transform Infrared Spectroscopy), TGA (Thermal Gravimetric Analysis), DSC (Differential Scanning Calorimetry), and GPC (Gel Permeation Chromatography). The mechanical properties (tensile stress and hardness) were obtained by using UTM, a Shore A tester, and a Taber abrasion tester. The viscoelastic properties were tested by an Rubber Processing Analyzer in dynamic strain sweep and dynamic frequency test modes. The chemical resistance was tested with methanol by using the swelling test method. Based on these results, the bio TPU synthesized with the ratio of 1:1:2.3, referred to as TPU 4, showed the highest thermal decomposition temperature, the largest molecular weight, and most compact matrix structure due to the highest ratio of the hard segment in the molecular structure. It also presented the highest tensile strength, the largest elongation, and the best viscoelastic properties among the different bio TPUs synthesized herein.

Compressive Properties of 3D Printed TPU Samples with Various Infill Conditions (채우기 조건에 따른 3D 프린팅 TPU 샘플의 압축 특성)

  • Jung, Imjoo;Lee, Sunhee
    • Journal of the Korean Society of Clothing and Textiles
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    • v.46 no.3
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    • pp.481-493
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    • 2022
  • This study investigated process conditions for 3D printing through manufacturing thermoplastic polyurethane (TPU) samples under different infill conditions. Samples were prepared using a fused deposition modeling 3D printer and TPU filament. 12 infill patterns were set (2D: grid, lines, zigzag; 3D: triangles, cubic, cubic subdivision, octet, quarter cubic; 3DF: concentric, cross 3D, cross, honeycomb), with 3 infill densities (20%, 50%, 80%). Morphology, actual time/weight and compressive properties were analyzed. In morphology: it was found that, as infill density increased, the increase rate of the number of units rose for 2D and fell for 3DF. Printing time varied with the number of nozzle movements. In the 3DF case, the number of nozzle movements increased rapidly with infill density. Sample weight increased similarly. However, where the increase rate of the number of units was low, sample weight was also low. In compressive properties: compressive stress increased with infill density and stress was high for the patterns with layers of the same shape.

A Study on Mixing Characteristics of Two-component Polyurethane for In-mold Coating (인몰드 코팅을 위한 이액형 폴리우레탄의 혼합특성에 관한 해석적 연구)

  • Lee, Ho Sang;Kim, Dong Mi
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.3
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    • pp.317-323
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    • 2013
  • In-mold coating is a reactive fluid designed to improve the surface quality of injection molded thermoplastic substrate in functional and cosmetic properties. In this study, a mixing head for in-mold coating was designed, and mixing characteristics of two-component polyurethane flowing through runner were investigated based on flow simulations. In order to achieve uniform mixing of two components injected through straight mixing head, an impingement aftermixer was used in runner design. Semi-circular cross-section was better than circular one for runners for uniform mixing. With increasing runner length and flow rate, mixing became more uniform. In addition, the degree of mixing was more improved with decreasing viscosity of isocyanate.

Effects of Polyol Types and Hard Segment Contents on the Crystallization of Thermoplastic Polyurethanes (열가소성 폴리우레탄의 결정화에 미치는 폴리올 종류 및 경질부 함량의 영향)

  • Kim Sung Geun;Li Ming Ji;Ramesan M. T.;Lee Dae Soo
    • Polymer(Korea)
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    • v.29 no.2
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    • pp.140-145
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    • 2005
  • Effects of the polyol type and the hard segment content of thermoplastic polyurethane (TPU) on the crystallization of hard segments in TPUs were studied employing differential scanning calorimetry. Diols used for the preparation of TPUs were poly(tetramethylene ether glycol) (PTMEG), poly(propylene glycol) (PPG), polycaprolactone (PCL), poly(butylene adipate) (PBA) the molecular weights of which were 2000 and the hard segments contents of TPUs were $35\~44\;wt\%$. We found that crystallization of hard segments in TPUs were observed at higher temperatures and became faster with increasing hard segment contents of TPUs. The crystallization rate of TPU was also affected by the types of polyols used for the preparation of TPUs. It is postulated that lower miscibility of soft segments and hard segments results in higher crystallization rate and increase of cooling crystallization temperatures due to better hydrogen bending between hard segments in melts.

Properties of Original Thermoplastic Polyurethane (TPU)/Plasticized Poly(vinyl chloride) (PVC) and Recycling TPU/PVC Blends (열가소성 폴리우레탄과 가소화된 폴리비닐 클로라이드 블렌드의 특성)

  • Yoo, Hye-Jin;Lee, Young-Hee;Hyuk, Bang-Yun;Hyeob, Beak-Sung;Kim, Han-Do
    • Proceedings of the Korean Fiber Society Conference
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    • 2001.10a
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    • pp.9-12
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    • 2001
  • Blending is an easy and popular means to achieve a desired set of characteristic properties. The blends, by melt mixing of thermoplastic materials and elastomer, have received considerable attention in recent years. It is well known that nearly all blends comprise one polymer domain dispersed in the matrices of the other polymer [1]. (omitted)

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Effect of Polymerization Procedure on Thermal and Mechanical Properties of Polyether Based Thermoplastic Polyurethanes

  • Kim, Seong-Geun;Lee, Dai-Soo
    • Macromolecular Research
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    • v.10 no.6
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    • pp.365-368
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    • 2002
  • Thermoplastic polyurethanes (TPUs) with different hard segment length has been prepared from a fixed molar ratio of poly(tetramethylene ether glycol), 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol by different polymerization procedures. Results reveal that the on-set temperature of endotherms ( $T_{cc}$ ) due to the crystallization of hard segments by cooling the TPUs from melt and the peak temperature of endotherms due to the melting of hard segments ( $T_{mh}$ ) by heating the TPUs increased and levelled off with increasing the hard segment length of TPUs. It has also been observed that soft segment glass transition temperature ( $T_{gs}$ ) of TPU decreased slightly with increasing the hard segment length, which explains less mixing of soft segments and hard segments. In tensile measurement of TPUs, strain hardening is observed with increasing the hard segment length, which is attributed to the strain induced crystallization of soft segments.