بررسی تاثیر ساختار مولکولی الاستومرهای پلی یورتان گرمانرم بر خواص آکوستیک و اتلاف صوت

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه متالورژی، دانشکده مهندسی، دانشگاه شیراز، شیراز، ایران

چکیده

الاستومرهای ترموپلاستیک پلی یورتان(TPUE) با مواد اولیه PTMG، HDI و BD در نسبت‌های مولی مختلف 1-2/4-3، 1-2/1-1 و 3-4/2-1 سنتز شدند. تاثیر نسبت استوکیومتری این مواد بر خواص جذب صوت و اتلاف آنها بررسی شد. جهت بررسی ساختار و خواص مواد سنتز شده، از طبف سنجی تبدیل فوریه مادون قرمز (FTIR)، گرماسنجی روبشی تفاضلی (DSC)، تفرق اشعه ایکس (XRD)، میکروسکوپ الکترونی روبشی (SEM)، وزن مخصوص و آنالیز مکانیکی دینامیکی (DMTA) استفاده شده است. ساختار شیمیایی TPUE با FTIR آنالیز شد. نتایج XRD نشان داد در پلیمر جدایش فازی به وجود آمده است. بررسی‌های XRD و DSC نشان داد تغییر درصد فاز سخت از 12 به 33 درصد سبب تغییر ساختار آمورف پلی یورتان به نیمه‌کریستال می‌شود. تغییر در ترکیب شیمیایی، سبب تغییر در ساختار مناطق سخت شده که این سبب تغییر دانسیته می‌شود. این تغییر ساختار همچنین سبب تغییر در مدول ذخیره و مدول اتلاف شده و فاکتور اتلاف را 75 درصد کاهش می‌دهد. علاوه بر این، سرعت و ضریب جذب صوت در دمای محیط و فرکانس یک هرتز 200 درصد تغییر می‌کند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the molecular structure of thermoplastic polyurethane elastomer upon acoustic and damping properties

نویسندگان [English]

  • Ali Yazdani
  • Habib Danesh manesh
  • mojtaba zebarjad
Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran
چکیده [English]

Thermoplastic polyurethane elastomer (TPUs) were synthesized by poly (oxytetramethylene) glycol (PTMG), hexamethylenediisocyanate (HDI) and 1, 4- Butanediol (BD) at three different molar ratios (1:4.2:3, 1:2.1:1, 3:4.2:1).The effect of stoichiometric balance on the acoustic and damping properties was evaluated. Fourier Transformed Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), X-ray Diffractometry (WAXS), Scanning Electron Microscope (SEM), specific gravity, Dynamic Mechanical Thermal Analysis (DMTA) and specific gravity were used to investigate the structures. PUUEs chemical structures were characterized by FTIR. The data on the scattering of the wide-angle X-ray is ascribed to the TPU matrix hard parts phase segregation.The results of DSC and XRD backed up the amorphous and crystalline type of PUEs with 12 and 33 wt % of hard segment (HS), respectively. Changing in molecular structure cases changing in hard segment and specific gravity. This was enhanced in HS, leading to changing in storage modules and damping factor. Damping factor decrease 75% and velocity and acoustic absorption coefficient, in room temperature and 1Hz frequency, changes 200%.

کلیدواژه‌ها [English]

  • Polyurethane
  • mole function
  • damping modulus
  • acoustic velocity

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