Measurement of Free Volume in Silicon-Cycloester Segmented Copolymer Using Positron Annihilation Lifetime Spectroscopy
| المصدر: | المجلة الجامعة |
|---|---|
| الناشر: | جامعة الزاوية - مركز البحوث والدراسات العليا |
| المؤلف الرئيسي: | Abdullah, Abduelmaged (Author) |
| مؤلفين آخرين: | Sultan, Omar (Co-Author) , Sweed, Mohamed (Co-Author) |
| المجلد/العدد: | مج20, ع2 |
| محكمة: | نعم |
| الدولة: |
ليبيا |
| التاريخ الميلادي: |
2018
|
| الشهر: | أكتوبر |
| الصفحات: | 79 - 96 |
| رقم MD: | 1263292 |
| نوع المحتوى: | بحوث ومقالات |
| اللغة: | الإنجليزية |
| قواعد المعلومات: | EduSearch, EcoLink, IslamicInfo, AraBase, HumanIndex |
| مواضيع: | |
| كلمات المؤلف المفتاحية: |
Free Volume | Positron Annihilation Lifetime Spectroscopy | Ortho-Positronium | Silicon-Cycloester Copolymers and Four | Components Fit
|
| رابط المحتوى: |
الناشر لهذه المادة لم يسمح بإتاحتها. |
| المستخلص: |
Positron annihilation lifetime spectroscopy (PALS) was used to measure the free volume in a series of Silicon-Cycloester segmented copolymer by analyzing the lifetime (LT) spectra using a three components fit and a four-components fit. In this paper, however the discussion is focused on determining the free volumes of the Silicon- Cycloester copolymer series using four-components fit. The characteristics of the longest-lived component(s) in the PALS ascribed to ortho-positronium (o-Ps) atoms decays in free-volume holes, are used to get information on the concentration of free-volume holes, the mean size of the holes, and the fractional free volume. The effects of the chemical composition (silicon content), on the o-Ps annihilation parameters and thus on the free volume of the Silicon-Cycloester copolymers, were investigated. Results also indicated that positron annihilation characteristics (the longest lifetime components (τ3 and τ4) and their intensities (I3 and I4) are very useful for studying the effect of the morphological parameters (microphase separation and crystallinity) on the free volume in the copolymer series. Changes in the Tg values of the silicon segment and the Cycloester segment in the copolymers were related to the o-Ps lifetime, which is indicative of a change in free volume in the copolymers. |
|---|
عناصر مشابهة
-
Applying Positron Annihilation Lifetime Spectroscopy in Measuring the Free Volume in Cycloester and Silicon Polymers
بواسطة: Abduallah, Abduelmaged منشور: (2014) -
Characterization of white Nile waters Using Laser- Induced Breakdown Spectroscopy "LIBS"
بواسطة: Edrees, Rabab Mahadi Altahir منشور: (2017) -
Photoacoustic spectroscopy
بواسطة: Al Aql, Abd Alrahman Ali منشور: (1981) -
Development of A Desktop STM Using Ballistic Electron Emission Microscopy and Spectroscopy to Study Ni-SIC Schottky Contacts
بواسطة: Al Hartomy, Omar Abd Allah منشور: (2005) -
Investigation of Oxygen Measurement in Relation to Three Photon Positron Annihilation
بواسطة: Al Khorayef, Mohammed Abd Alrahman منشور: (2004)
