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Helium-oxygen plasma treatments were conducted to modify poly(trimethylene terephthalate)(PTT) and poly(ethylene terephthalate)
(PET) warp knitted fabrics under atmospheric pressure. Lubricant and contamination removals by plasma etching effect were
examined by weight loss (%) measurements and scanning electron microscopy (SEM) analysis. Surface oxidation by plasma treatments
was revealed by x-ray photoelectron spectroscopy (XPS) analyses, resulting in formation of hydrophilic groups and moisture
regain (%) enhancement. Low-stress mechanical properties (evaluated by Kawabata evaluation system) and bulk properties (air
permeability and bust strength) were enhanced by plasma treatment. Increasing interfiber and interyarn frictions might play
important roles in enhancing surface property changes by plasma etching effect, and then changing low-stress mechanical properties
and bulk properties for both fabrics. 相似文献
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The properties of a woven fabric made of poly(trimethylene terephthalate) (PTT) were investigated. The PTT fabric of draw
textured yarn (DTY) showed excellent stretch as good as a fabric containing spandex. However, the unique stretch of the PTT
fabric reduced dramatically by simple heat-treatment even at as low as 80 °C. To understand the phenomenon, the crimp rigidity
of the DTY was observed by SEM. It was found that the drastic reduction of stretch was caused by irreversible uncrimping of
PTT DTY after heat-treatment. Conclusively, it is of importance to optimize the texturing conditions for PTT DTY to make the
crimp more stable. 相似文献
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Anticoagulant effects of inhaled unfractionated heparin in the dog as determined by partial thromboplastin time and factor Xa activity 
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Gentry PA Ross ML 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1986,15(3):12-16
In a survey of coagulation, biochemical and hematological parameters in cattle homozygous (deficient), heterozygous (carrier) and non-affected (normal) for Factor XI deficiency, only the Activated Partial Thromboplastin Time (APTT) results correlated with plasma Factor XI activity levels. The APTT results and the thrombokinetics for the deficient animals were markedly different from the results of either the carrier or normal animals. However, the APTT assay was shown not to be sufficiently sensitive to differentiate between the normal and carrier state for the coagulation disorder. Not only was there no statistical difference between the mean APTT results for the normal and carrier animals, but the thrombokinetics for fibrin clot formation for the two groups were also similar. 相似文献
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Profiles development of the melt spinning process of poly(trimethylene terephthalate) (PTT) was simulated by a numerical method.
The spinning speed of 3 km/min to 5 km/min was analyzed and the characteristic of PTT spinning process was compared with that
of poly(ethylene terephthalate) (PET). Velocity development of PTT was slower than that of PET. Although PTT’s spinning temperature
was lower than PET’s, the PTT solidified slower because of a smaller super-cooling and the large specific heat capacity. The
diameter profile of PTT decreases gradually in comparison with that of PET. PTT’s strain rate has a broader distribution than
PET’s and its maximum ranged from 541 to 570 s−1 for PET and 136 to 149 s−1 for PTT. PTT’s tensile stress was smaller than PET’s. 相似文献
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Tae?Won?SonEmail author Kwang?Il?Kim Nam?Hun?Kim Min?Gi?Jeong Young?Hun?Kim 《Fibers and Polymers》2003,4(1):20-26
The thermal behavior, morphology, ester-interchange reaction of Poly(trimethylene terephthalate) (PTT)/Poly(ethylene terephthalate)
(PET) melt blends were investigated over the whole composition range(xPTT/(1-x)PET) using a twinscrew Brabender. The melt
blends were analyzed by differential scanning calorimetry (DSC), nuclear magnetic resonance spectroscopy (13C-NMR), and scanning electron microscopy (SEM). Single glass transition temperature (T
g
) and cold crystallization temperature (T
cc
) were observed in all melt blends. Melt blends were found to be due to the ester-interchange reaction in PTT/PET blend. Also
the randomness of copolymer increases because transesterification between PTT and PET increases with increasing blending time.
This reaction increases homogeneity of the blends and decreases the degree of crystallinity of the melt blends. In PTT-rich
blends, mechanical properties decrease with increase of PET content compared with that of pure PTT. And, in PET-rich blends,
tensile modulus decreases with increase of PTT content, but tensile strength and elongation is similar to that of pure PET. 相似文献
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