Mechanical Properties and Thermal Behavior of Thermoplastic Polyurethane Toughening Polylactide Prepared by Vane Extruder

2013 ◽  
Vol 431 ◽  
pp. 110-115 ◽  
Author(s):  
Jia Jia Chen ◽  
Huan Yu Liu ◽  
Gui Zhen Zhang ◽  
Jin Ping Qu
Keyword(s):  
Mechanical Properties ◽  
Biodegradable Polymer ◽  
Thermoplastic Polyurethane ◽  
Elongational Flow ◽  
Elongation At Break ◽  
Mechanical Process ◽  
Crystallization Ability ◽  
Two Phases ◽  
Dsc Curves

Vane extruder is a novel equipment in which polymer mainly suffers from elongational deformation. It has the character of short thermal mechanical process so that the biodegradable polymer will less decompose during processing. Different weight ratios of thermoplastic polyurethane (TPU) were blend with polyactide (PLA) in vane extruder. The results show that TPU plays the role of toughening the PLA which is well dispersed in the PLA matrix. From the mechanical properties, for the composite with 40 wt % TPU, the elongation at break of the blend reached 335%. Meanwhile the results observed from DSC curves revealed apparent partial miscibility of the blends and enhanced crystallization ability of PLA due to the influence of elongational flow. From the DMA curves, it could be found that PLA and TPU compatibility of two phases have been improved to some extent because of the elongational deformation.

Study on Mechanical Properties and Phase Morphology of Thermoplastic Polyurethane/Polypropylene Blends Prepared with Vane Extruder

2012 ◽  
Vol 600 ◽  
pp. 256-260 ◽  
Author(s):  
Wei Feng Liu ◽  
Jin Ping Qu ◽  
Shi Kui Jia ◽  
Yong Qing Zhao
Keyword(s):  
Mechanical Properties ◽  
Thermoplastic Polyurethane ◽  
Elongational Flow ◽  
Phase Morphology ◽  
Sem Micrographs ◽  
Partial Miscibility ◽  
Crystallization Ability ◽  
Polypropylene Blends ◽  
Pp Blends ◽  
Dsc Curves

Thermoplastic polyurethane (TPU)/polypropylene (PP) blends with different weight ratios were prepared in a novel vane extruder generating global and dynamic elongational flow. The results indicated that the addition of TPU elastomer to PP significantly improved the mechanical properties of the blends. From the SEM micrographs it could be clearly observed dispersed TPU deformed to be fibers by the effect of elongational flow. Meanwhile the results observed from DSC curves revealed apparent partial miscibility of the blends and enhanced crystallization ability of PP due to the influence of elongational flow

scholarly journals Maleic Anhydride-Grafted Isotactic Polybutene-1 and Modified Polyamide 6

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 872 ◽  
Author(s):  
Yongxian Zhao ◽  
Chen Ma ◽  
Shijie Cheng ◽  
Wei Xu ◽  
Yuejuan Du ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Crystallization Rate ◽  
Polyamide 6 ◽  
Melt Flow Rate ◽  
Elongation At Break ◽  
Melt Grafting ◽  
Relative Molecular Weight ◽  
Two Phases ◽  
Optimized Conditions ◽  
Dsc Curves

Maleic anhydride (MAH)–divinyl benzene (DVB) multi-monomer melt-grafting onto isotactic polybutene-1 (iPB-1) was carried out in a torque rheometer. The effects of dicumyl peroxide (DCP), MAH, and DVB concentrations, and temperature, on the reaction, were investigated. The optimized conditions were 170 °C, DVB/MAH = 4:6 (mass ratio). DVB as a comonomer enhanced the grafting degree (Gd) and grafting efficiency (Ge) of iPB-g-MAH better than styrene. The initiator DCP had little effect on Gd as its concentration over 0.2 phr, but the grafts’ melt flow rate (MFR) increased significantly, and relative molecular weight decreased remarkably with increased DCP concentration. With increasing Gd, the contact angle of grafts with water decreased, and there was a larger crystallization rate. The study of iPB-1 and iPB-g-MAH (Gd = 1.5%)-modified polyamide 6 (PA6) showed that iPB-g-MAH had an obviously toughening effect on PA6. With increasing iPB-g-MAH concentration, the blends of impact strength and elongation at break increased obviously, tensile strength decreased slightly, and MFR decreased prominently, which greatly slowed the processing degradation of PA6. The properties of iPB-1/PA6 blends deteriorated. Both DSC curves and SEM micrographs confirmed that PA6/iPB-g-MAH blends had much better compatibility than PA6/iPB. The reason was that the anhydride group in iPB-g-MAH reacted with amide group in PA6 to improve the compatibility between two phases, and iPB-g-MAH is an excellent modifier for PA6.

The Effect of Mixed Chain Extender on the Hydrogen Bonding, Thermal and Mechanical Properties of TPUs

2020 ◽  
Vol 1001 ◽  
pp. 16-21
Author(s):  
Ju Jie Sun ◽  
Hai Rui Wang ◽  
Lan Cao ◽  
Tridib K. Sinha
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Hydrogen Bonding ◽  
Thermoplastic Polyurethane ◽  
Chain Extender ◽  
Mixing Ratio ◽  
Thermal And Mechanical Properties ◽  
Elongation At Break ◽  
Chain Extenders ◽  
Hard Block

Chain extender plays a significant role in enhancing the final mechanical properties of thermoplastic polyurethane (TPUs) derived from polytetra methylene etherglycol (PTMG) and 4,4-diphenylmethane diisocyanate (MDI). In this research we focused on the effect that mixed chain extender of ethylene glycol (EG) and 1,4-butanediol (BDO) used has on the phase behavior and morphology of high hard block content TPUs. DSC, FTIR, and mechanical testing were mainly used to characterize the morphology and properties of the TPUs materials. Through this work we were able to show that mixed ratio of different chain extenders had dramatic effects on the properties of the TPUs. After mixing EG and BDO, the degree of hydrogen bonding, melting temperature, tensile strength, tear strength, and hardness of TPUs are all reduced, the glass transition temperature is increased. when the mixing ratio is 1: 1 , the elongation at break is increased to 672% . However, when the mixing ratio is n (EG): n (BDO) = 1: 2, the tensile strength is increased to 29.2 MPa, and the elongation at break is reduced to 353%.

scholarly journals Analysis of Woven Fabric at the Place of the Sewn Seam

2018 ◽  
Vol 18 (3) ◽  
pp. 216-220 ◽  
Author(s):  
Beti Rogina-Car ◽  
Ivana Schwarz ◽  
Stana Kovačević
Keyword(s):  
Mechanical Properties ◽  
Material Properties ◽  
Raw Material ◽  
Woven Fabric ◽  
Breaking Force ◽  
Time Intervals ◽  
Elongation At Break ◽  
Test Conditions ◽  
Stretching Intensity

Abstract Key importance and the role of sewn seam in the woven fabric are presented. Fabric properties in the places joined with the sewn seam on which garment durability, applicability, appearance and quality depend are highlighted. Seam location is usually the weakest spot on the garment, especially when the great loads are present at these places. Mechanical properties of the sewn fabrics were investigated in different test conditions. The influence of the load on the sewn seam is analyzed in time intervals. Sample with seam have approximately 70% lower breaking properties (breaking force and elongation at break) than the sample without seam. By preloading the seam fabrics with 30%, 50% and 70% of elongation at break, for a 3-h period, the effect on mechanical properties were tested and the differences in pre-stretching intensity were observed. By conducting such test, it is expected that the fabric experience further degradation and that breaking properties further reduce, but the exact opposite occurred (breaking properties, by increasing the preload, increase even more), because of various material properties (structural fabric properties, raw material characteristics, seam characteristics).

scholarly journals Mechanical Properties of Flexible TPU-Based 3D Printed Lattice Structures: Role of Lattice Cut Direction and Architecture

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2986
Author(s):  
Victor Beloshenko ◽  
Yan Beygelzimer ◽  
Vyacheslav Chishko ◽  
Bogdan Savchenko ◽  
Nadiya Sova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lattice Structure ◽  
Pore Space ◽  
Thermoplastic Polyurethane ◽  
Bending Tests ◽  
Three Point Bending ◽  
Lattice Materials ◽  
3D Printed ◽  
Anisotropy Of Mechanical Properties

This study addresses the mechanical behavior of lattice materials based on flexible thermoplastic polyurethane (TPU) with honeycomb and gyroid architecture fabricated by 3D printing. Tensile, compression, and three-point bending tests were chosen as mechanical testing methods. The honeycomb architecture was found to provide higher values of rigidity (by 30%), strength (by 25%), plasticity (by 18%), and energy absorption (by 42%) of the flexible TPU lattice compared to the gyroid architecture. The strain recovery is better in the case of gyroid architecture (residual strain of 46% vs. 31%). TPUs with honeycomb architecture are characterized by anisotropy of mechanical properties in tensile and three-point bending tests. The obtained results are explained by the peculiarities of the lattice structure at meso- and macroscopic level and by the role of the pore space.

scholarly journals The Role of Interfacial Interactions on the Functional Properties of Ethylene–Propylene Copolymer Containing SiO2 Nanoparticles

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2308
Author(s):  
Iman Taraghi ◽  
Sandra Paszkiewicz ◽  
Izabela Irska ◽  
Krzysztof Pypeć ◽  
Elżbieta Piesowicz
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Sio2 Nanoparticles ◽  
Interfacial Interactions ◽  
Melt Mixing ◽  
Elongation At Break ◽  
Ethylene Propylene ◽  
Optically Transparent ◽  
Mixing Method

In this paper, the mechanical properties, thermal stability, and transparency of ethylene–propylene copolymer (EPC) elastomer modified with various weight percentages (1, 3, and 5 wt.%) of SiO2 nanofillers have been studied. The nanocomposites were prepared via a simple melt mixing method. The morphological results revealed that the nanofillers were uniformly dispersed in the elastomer, where a low concentration of SiO2 (1 wt.%) had been added into the elastomer. The FTIR showed that there are interfacial interactions between EPC matrix and silanol groups of SiO2 nanoparticles. Moreover, by the addition of 1 wt.% of SiO2 in the EPC, the tensile strength and elongation at break of EPC increased by about 38% and 27%, respectively. Finally, all samples were optically transparent, and the transparency of the nanocomposites reduced by increasing the content of SiO2 nanoparticles.

Preparation and Characterization of TPU Toughened PLA Elastic Fibers

2014 ◽  
Vol 789 ◽  
pp. 117-121 ◽  
Author(s):  
Shi Chao Wang ◽  
Heng Xue Xiang ◽  
Xiao Shuang Wen ◽  
Zhe Zhou ◽  
Mei Fang Zhu
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Melt Spinning ◽  
Thermoplastic Polyurethane ◽  
Strong Interactions ◽  
Poly Lactic Acid ◽  
Elastic Fibers ◽  
Elongation At Break ◽  
Thermal Stability Of

Poly (lactic acid) (PLA) elastic fibers were prepared by melt spinning using Thermoplastic polyurethane (TPU) as a toughing agent and PLA-g-MA(Maleic anhydride) as a compatibilizer. Thermal properties and thermal stability of PLA/TPU composites, as well as the cross section morphology and mechanical properties of fibers were studied in the present investigation. DSC results showed that PLA was immiscible with TPU. In addition, the incorporation of TPU decreased the melting enthalpy of PLA/TPU composites. TG results indicated that the initial degradation temperatures of composites were also decreased by the appearance of TPU, and it decreased by 9°Cwhen TPU content was up to 20wt%. FESEM results confirmed that strong interactions were existed between PLA and TPU phases, which were benefit for the improvement of PLA/TPU fibers’ mechanical properties. Results of tensile testing demonstrated that TPU could improve the toughness of fibers effectively and the elongation-at-break of fibers increased from 2.2% of PLA to 203.9% of PLA/TPU.

Effect of PA6 Addition on the Mechanical Properties of PMMA Blends

2011 ◽  
Vol 284-286 ◽  
pp. 509-512
Author(s):  
Zhen Hua Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Modulus ◽  
Minor Component ◽  
Model System ◽  
Elongation At Break ◽  
Reinforced Polymer ◽  
The Matrix ◽  
Two Phases ◽  
The Impact ◽  
Pmma Blends

This article studies the mechanical properties of PA6 reinforced polymer blends comprised of a soft PMMA matrix. These composites are designed as a model system to investigate the impact of the content of the two phases on the composite mechanical properties. The addition of the PA6 phase to the matrix PMMA increases the strength of the blend, but lowers its toughness as it decreases the elongation at break. When PA6 particles are added the blends become relatively brittle. The composites containing moderate content of PA6 particles show enhanced tensile modulus and strength. This enhancement is associated with the formation of a network within the polymeric matrix comprised of PA6 particles welded together by the minor component.

Role of Alkali Treatment on Mechanical and Thermal Properties of Bamboo Particles Reinforced Polyvinylchloride Composites

2009 ◽  
Vol 79-82 ◽  
pp. 545-548 ◽  
Author(s):  
Hui Wang ◽  
Tian Lan ◽  
Kui Chuan Sheng ◽  
Xiang Qun Qian ◽  
Rui Chang
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Thermal Properties ◽  
Alkali Treatment ◽  
Alkali Solution ◽  
Mechanical And Thermal Properties ◽  
New Materials ◽  
Maximum Value ◽  
Dsc Curves

In order to illustrate the role of alkali treatment of bamboo particles reinforced polyvinylchloride composites (BPPC), bamboo particles were treated by alkali aqueous solution with a serial concentration of 0.5%, 1%, 2%, 5% and 10%. Mechanical, thermal properties of alkali treated BPPC and micro-micrographs of the fracture surface were researched and compared with raw bamboo particles fabricated BPPC respectively. Results showed that tensile strength of BPPC increased before the solution reached the concentration of 5% and got a maximum value of 15.07MPa at the concentration of 5%. The curve decreased significantly as the concentration of solution went higher as to 10%. Modules of rupture got a highest value of 44.73MPa till reached the concentration of 2% and then decreased. Modules of elasticity increased in the whole before reached the concentration of 5% and the maximum value was 4362.48MPa which was 5 times more than the original bamboo particles. DSC curves illustrated that raw bamboo particles mixed with PVC showed a higher Tg which meant that raw fiber was not well compatible with PVC and BPPC treated with alkali solution performed a better compatibility. According to SEM observations, interface interaction of fiber-matrix that were modified of alkali solution upon bamboo particles appeared a better interlock action correlated to higher mechanical properties and better compatibility between fiber and matrix. Hence, the use of alkali treated bamboo particles as reinforcement was a feasible and competitive method of creating new materials.

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