Comprehensive performances of polytetrafluoroethylene(PTFE) flat filaments used as suture materials in medical field can be affected significantly by morphological and mechanical characteristics.Due to low tensile str...Comprehensive performances of polytetrafluoroethylene(PTFE) flat filaments used as suture materials in medical field can be affected significantly by morphological and mechanical characteristics.Due to low tensile strength and non-uniform morphology,PTFE flat filaments cannot be applied widely as medical sutures.In order to solve flaws above,PTFE flat filaments with constant linear density,550 dtex,are manufactured and dependences of morphology,frictional features and mechanical behaviors on stretching ratio and temperature are also analyzed.The results indicate that PTFE flat filaments with high tensile strength(1 922.0 cN) and excellent apparent performance can be manufactured at optimal stretching ratio and temperature,18.0 and350 ℃,respectively.展开更多
A new wiping material made through wet-laid and aquajet-spunlace nonwoven technology has been developed,which is composed of wood pulp and viscose staple fibers.The aim of this paper is to analyze the microstructures ...A new wiping material made through wet-laid and aquajet-spunlace nonwoven technology has been developed,which is composed of wood pulp and viscose staple fibers.The aim of this paper is to analyze the microstructures of wet-laid and aquajetspunlace material and wet-laid preliminary spunlace material,and elucidate the stretching and bending mechanism of machine direction(MD) and cross-machine direction(CD).The results suggest that composite material is mainly formed by wood pulps,while viscose fibers serve as the reinforcement.Meanwhile,spunlacing improves the entanglement and cohesion between wood pulp and viscose staple fibers.In spite of the slight loss in breaking strength,fluffiness,hand feeling and elongation of the material after spunlacing have been improved significantly.展开更多
The effect of elongation of particles in dispersion powders on mechanical performance of polytetrafluoroethylene(PTFE)flat filament is analyzed.Morphology and elongation of particles in four different PTFE dispersion ...The effect of elongation of particles in dispersion powders on mechanical performance of polytetrafluoroethylene(PTFE)flat filament is analyzed.Morphology and elongation of particles in four different PTFE dispersion powders are analyzed.Meanwhile,the correlation between elongation and diameter of dispersion particles is discussed.Strength-elongation curves of PTFE flat filaments made of four different dispersion powders are obtained from measurements of mechanical behaviors.Experimental results show that PTFE flat filament manufactured with dispersion particles having appropriate elongation(0.55-0.60)shows excellent mechanical performance.This work could be regarded as a reference for manufacturing high performance PTFE flat filaments.展开更多
基金the Doctoral Fund of Ministry of Education of China(No.CUSF-DH-D-2015012)National Natural Science Foundation of China(No.51403033)Fundamental Research Funds for the Central Universities,China(No.2232014D3-15)
文摘Comprehensive performances of polytetrafluoroethylene(PTFE) flat filaments used as suture materials in medical field can be affected significantly by morphological and mechanical characteristics.Due to low tensile strength and non-uniform morphology,PTFE flat filaments cannot be applied widely as medical sutures.In order to solve flaws above,PTFE flat filaments with constant linear density,550 dtex,are manufactured and dependences of morphology,frictional features and mechanical behaviors on stretching ratio and temperature are also analyzed.The results indicate that PTFE flat filaments with high tensile strength(1 922.0 cN) and excellent apparent performance can be manufactured at optimal stretching ratio and temperature,18.0 and350 ℃,respectively.
基金Fundamental Research Funds for the Central Universities,China(No.CUSF-DH-D-2016017)
文摘A new wiping material made through wet-laid and aquajet-spunlace nonwoven technology has been developed,which is composed of wood pulp and viscose staple fibers.The aim of this paper is to analyze the microstructures of wet-laid and aquajetspunlace material and wet-laid preliminary spunlace material,and elucidate the stretching and bending mechanism of machine direction(MD) and cross-machine direction(CD).The results suggest that composite material is mainly formed by wood pulps,while viscose fibers serve as the reinforcement.Meanwhile,spunlacing improves the entanglement and cohesion between wood pulp and viscose staple fibers.In spite of the slight loss in breaking strength,fluffiness,hand feeling and elongation of the material after spunlacing have been improved significantly.
基金Shanghai Economic and Information Technology Commission,China(No.HUCXY-2014-025)
文摘The effect of elongation of particles in dispersion powders on mechanical performance of polytetrafluoroethylene(PTFE)flat filament is analyzed.Morphology and elongation of particles in four different PTFE dispersion powders are analyzed.Meanwhile,the correlation between elongation and diameter of dispersion particles is discussed.Strength-elongation curves of PTFE flat filaments made of four different dispersion powders are obtained from measurements of mechanical behaviors.Experimental results show that PTFE flat filament manufactured with dispersion particles having appropriate elongation(0.55-0.60)shows excellent mechanical performance.This work could be regarded as a reference for manufacturing high performance PTFE flat filaments.
