structural and physical properties of filament yarns melt-spun from pp/ldpe blend before and after false-twist texturing
نویسندگان
چکیده
nowadays, polymer blends usages increase more and more in order to produce materials with better properties. according to many research works, the blends of polyolefins have shown industrial importance. the purpose of this project was to carry out some investigations on fibers melt spun from the polypropylene and low density polyethylene blends. pp and ldpe are immiscible. pp/ldpe blend filament yarns with the blend ratios of 100/0, 99/1, 97/3, 95/5, 93/7, 90/10 were produced by the melt spinning process. microstructure (density, dsc, birefringence) and physical properties (tenacity, breaking elongation, initial modulus and shrinkage of samples) were measured and compared. the results showed that presence of ldpe in blend samples does not influence the density and crystallinity of pp. however, increasing the fraction of ldpe in blend samples also increases the shrinkage of drawn yarns. the tenacity of as-spun and drawn yarns displayed a downward trend by increasing the ldpe in blend. but the breaking elongation presented an upward trend. tensile properties of textured yarns spun from pp/ldpe blends were higher than those of pure pp at all applied texturing temperatures (apart from 150 c). increasing the texturing temperature resulted in the increasing of crimp properties. however, the rate of increase is lower when the fraction of ldpe is higher.
منابع مشابه
Investigating the Effect of False Twist Texturing Process on the Color Coordinates Variation of Spun-dyed Polyester Filament Yarns
Correspondence to: Mohammad Amani Tehran email: [email protected] ABSTRACT In this study, color coordinates variation of spundyed polyester filament yarns subjected to the false twist texturing process was investigated. Furthermore, the effect of different processing parameters including D/Y ratio, twist, heater temperature, texturing speed, overfeed, the draw ratio and intermingling process on t...
متن کاملdetermination of some physical and mechanical properties red bean
چکیده: در این تحقیق، برخی خواص فیزیکی و مکانیکی لوبیا قرمز به-صورت تابعی از محتوی رطوبت بررسی شد. نتایج نشان داد که رطوبت بر خواص فیزیکی لوبیا قرمز شامل طول، عرض، ضخامت، قطر متوسط هندسی، قطر متوسط حسابی، سطح تصویر شده، حجم، چگالی توده، تخلخل، وزن هزار دانه و زاویه ی استقرار استاتیکی در سطح احتمال 1 درصد اثر معنی داری دارد. به طوری که با افزایش رطوبت از 54/7 به 12 درصد بر پایه خشک طول، عرض، ضخام...
15 صفحه اولextraction and acetylation of purified trypsin from bovin pancreas and study of some its physico-chemical properties
آنزیم تریپسین در شرایط قلیایی ناپایدار می باشد .و فعالیت پروتئولیتیکی تریپسین منجربه خود هضمی آن در جایگاههای خاصی می گردد. بنابر این آنزیمی با ناپایداری بالا محسوب میگردد. در سالهای اخیر موفق شدند که با ایجاد تغیرات شیمیایی با اضافه کردن فلزات خاص ، کلسیم و یا عمل استیلاسیون منجر به افزایش پایداری آنزیم تریپسین گردند. مطالعات در حال حاضر نشان می دهد که تریپسین استیله شده فعالیت آنزیمی خود را ...
15 صفحه اولBiodegradable kefiran-chitosan-nanocellulose blend film: Production and physical, barrier, mechanical, thermal, and structural properties
In this study, biodegradable kefiran-chitosan-nanocellulose blend films were developed and their physical, mechanical, barrier, thermal and structural properties determined. Results showed that adding nanocellulose had not any significant effect on the thickness, moisture content and water solubility. Also, water vapor permeability, tensile strength and lightness increased and the elongation at...
متن کاملThe investigation of physical and chemical properties of collagenous tissue before and after ArF laser irradiation
متن کامل
Magnetic properties and synthesis conditions of Nd2Fe23B3 melt-spun alloy
The formation of amorphous and crystalline state of the Nd2Fe23B3 alloy from melt-spun ribbon is presented. The synthesis conditions are investigated combining DSC, X-ray diffraction and thermomagnetic analysis. The thermomagnetic analysis is found to be very useful to optimize the synthesis process. Comparison of these results enables to discuss the thermal stability of both the amorphous and ...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
علوم و تکنولوژی پلیمرجلد ۲۱، شماره ۱، صفحات ۹-۱۸
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023