scholarly journals Polyether Based Thermoplastic Polyurethane Melt Blown Nonwovens

2006 ◽  
Vol 1 (1) ◽  
pp. 155892500600100 ◽  
Author(s):  
Terezie Zapletalova ◽  
Stephen Michielsen ◽  
Behnam Pourdeyhimi
Keyword(s):  
Fiber Orientation ◽  
Thermoplastic Polyurethane ◽  
Strong Relationship ◽  
Thermoplastic Elastomers ◽  
Distribution Functions ◽  
Structure Property ◽  
Melt Blowing ◽  
Polyurethane Elastomers ◽  
Fiber Orientation Distribution ◽  
The Web

A series of melt blown samples were produced from three hardness grades of ether based thermoplastic polyurethane elastomers (TPU). The fabrics were tested to investigate their structure-property relationship in a melt blown process. Solution viscosities of the web were only 20–26% of there original values indicating a large loss in polymer molecular weight during melt blowing. Fiber diameter distributions measured on melt blown samples were found comparable to those made with more conventional polymers. The fiber orientation distribution functions (ODF) suggest slight fiber orientation in machine direction. Tensile and elongation properties depended on die-to-collector distance (DCD), polymer hardness and fiber ODF. A strong relationship between the tensile strength and die-to-collector distance was identified and attributed to reduced interfiber adhesion in the web with increasing DCD. The reduction in adhesion was attributed to greater extents of solidification before reaching the forming belt for longer DCDs. This paper is the first in a series relating the influence of the melt blowing process parameters on the polymer properties and the nonwoven fabric properties for block thermoplastic elastomers.

Synthesis and thermal and mechanical properties of nonisocyanate poly(ether urethane) thermoplastic elastomers containing dibutylene terephthalate and poly(tetramethylene ether) segments

2020 ◽  
pp. 009524432092856
Author(s):  
Wang Guoliang ◽  
Wang Qian ◽  
Zhao Jingbo ◽  
Zhang Zhiyuan ◽  
Zhang Junying
Keyword(s):  
Mechanical Properties ◽  
Microphase Separation ◽  
Thermoplastic Polyurethane ◽  
Gel Permeation Chromatography ◽  
Thermal Characterization ◽  
Thermoplastic Elastomers ◽  
Thermal And Mechanical Properties ◽  
Reduced Pressure ◽  
Polyurethane Elastomers ◽  
Force Microscopy

Several novel semiaromatic poly(ether urethane) thermoplastic elastomers were synthesized through a nonisocyanate route. The nonisocyanate thermoplastic polyurethane elastomers (NI-TPUEs) were prepared via a transurethane polycondensation of bis(hydroxyethyl) hexanediurethane with bis(4-hydroxybutyl) terephthalate and poly(tetramethylene glycol)s under a reduced pressure of 3 mmHg at 170°C. The NI-TPUEs were fully characterized. The influence of hard segment (HS) contents on thermal and mechanical properties was studied. Gel permeation chromatography characterization demonstrated that high molecular weight of NI-TPUEs was obtained. Wide-angle X-ray scattering and thermal characterization verified that NI-TPUEs were crystallizable and had a relatively high melting point. Atomic force microscopy exhibited microphase separation between the crystallized HSs and amorphous phases. High content of HSs and flexible poly(tetramethylene ether) soft segments leads to good crystallization, excellent mechanical property, and good resilience of NI-TPUEs.

Theoretical Prediction and Experimental Research on the Tensile Strength of GF-TPU Composite

2011 ◽  
Vol 217-218 ◽  
pp. 300-305
Author(s):  
Jian Yun He ◽  
Ma Ming ◽  
Ke Jian Wang
Keyword(s):  
Tensile Strength ◽  
Fiber Orientation ◽  
Thermoplastic Polyurethane ◽  
Orientation Distribution ◽  
Prediction Equation ◽  
Matrix Interface ◽  
Test Results ◽  
Fiber Orientation Distribution ◽  
Fiber Matrix Interface ◽  
The Relationship

Based on fiber length, fiber orientation distribution, ratio of length to diameter and fiber-matrix interface, the theoretic prediction equation of tensile strength has been established for glass fiber/thermoplastic polyurethane (GF-TPU) composite. The relationship between the structure and tensile strength of GF-TPU composite was theoretically and experimentally studied. The results showed that the predicted tensile strength fits the test results quite well.

Controllable anisotropic properties of wet-laid hydroentangled nonwovens

TAPPI Journal ◽  
2019 ◽  
Vol 18 (3) ◽  
pp. 173-180
Author(s):  
Chao Deng ◽  
Jue Hou ◽  
Xing Zhang ◽  
R. Hugh Gong ◽  
Xiangyu Jin
Keyword(s):  
Tensile Strength ◽  
Fiber Orientation ◽  
Orientation Distribution ◽  
Mechanical Tests ◽  
Anisotropic Properties ◽  
Liquid Spreading ◽  
Fiber Orientation Distribution ◽  
End Use ◽  
Length And Area ◽  
The Web

For nonwovens, fiber orientation distribution is an important structural characteristic that directly influences the anisotropic properties of the materials. Different Vslurry/Vbelt ratios were adopted to fabricate nonwovens during the wet-laid process. The results indicated that fiber orientation distribution of nonwovens can be regulated by adopting different Vslurry/Vbelt ratios owing to the web-forming principle of wet-laid techniques. Mechanical tests showed that both wet and dry tensile strength of nonwovens in different angle directions present anisotropy under different Vslurry/Vbelt ratio parameters. A liquid spreading distribution experiment proved that liquid spreading length and area of nonwovens could be manipulated using different Vslurry/Vbelt ratios in the fabrication process. Therefore, specific anisotropic properties of wet-laid hydroentangled nonwovens can be realized by controlling the process parameters for particular end-use applications.

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