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Date: 20-9-2017
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Date: 12-1-2020
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Date: 1-9-2016
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TRANSPOLYPENTAMER
Transpolypentamer (TPR) is produced by the ring cleavage of cyclopentene. Cyclopentene is obtained from cracked naphtha or gas oil, which contain small amounts of cyclopentene, cyclopentadiene, and dicyclopentadiene. Polymerization using organometallic catalysts produce a stereoregular product (trans 1,5-polypentamer):
Due to the presence of residual double bonds, the polymer could be crosslinked with regular agents. TPR is a linear polymer with a high trans configuration. It is highly amorphous at normal temperatures and has a Tg of about 90°C and a density of 0.85.
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علامات بسيطة في جسدك قد تنذر بمرض "قاتل"
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أول صور ثلاثية الأبعاد للغدة الزعترية البشرية
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مكتبة أمّ البنين النسويّة تصدر العدد 212 من مجلّة رياض الزهراء (عليها السلام)
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