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Register a new userStuding the inhibition of aging of some polymers
دراسة إعاقة تقادم بعض البوليمرات
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Aِl-Baath University رسالة ماجستير
Publication date
2019
fields
Chemistry
and research's language is
العربية
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Shamra Editor
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تم في هذا البحث دراسة تأثير chimassorb 944 على بولي الإتيلن وبولي البروبيلن وفق نسب مختلفة من 0% إلى 1.4 % من chimassorb 944
In this research we are studying the effects of the stabilizer chimassorb 944 on polyethylene and polypropylene according to different averages starting from 0% to 1.4% of chimassorb 944.
References used
G. Odian, (2004)- Principles of Polymerization, john wiley & Sons,
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In the last two decades, the use of advanced composite materials such
as Fiber Reinforced Polymers (FRP) in strengthening reinforced
concrete (RC) structural elements has been increasing. Research and
design guidelines concluded that externally bo
nded FRP could increase
the capacity of RC elements efficiently. However, the linear stressstrain
characteristics of FRP up to failure and lack of yield plateau have
a negative impact on the overall ductility of the strengthened RC
elements. Use of hybrid FRP laminates, which consist of a
combination of either carbon and glass fibers, or glass and aramid
fibers, changes the behavior of the material to a non-linear behavior.
This paper aims to study the performance of reinforced concrete beams
strengthened by hybrid FRP laminates.
In this study, several samples of a common polymer (aniline-phenolformaldehyde)
we prepared by condensation polymerization method based
on aniline, phenol, formaldehyde and in the presence of a catalyst of
ammonia solution at different concentrations.
The molecular weight (Mw, Mv) variations according to Cole - Cole
representations were studied by applying variable temperature degrees,
dynamic frequencies on a number of polymers: polypropylene (PP) isotactic,
polybutene (PB), polyamide-١٢ (PA-١٢), high density polyethylene (HDPE).
This research was carried out during two seasons 2014 – 2015 to study effect of seed
coats on germination of endocarp, seed and embryos of two wild genotypes (M1, M2) of
Mahaleb rootstock (Prunus mahaleb L.) prevailing in Alhaffa area, Lattakia. Th
e
experiments were done at Lattakia Scientific Agricultural Research center and Faculty of
Agriculture at Tishreen University.
The Results of the seeds planted on agar 0.7% in dark at 15 C° showed that no
germination of the M1 endocarp VS late and low germination at 10% for the M2 endocarp
starting after 98 days. As for seeds, the germination was (66.66%) and (53.33%) for M1
and M2, respectively. Removal of the woody coat (endocarp) and seed coat makes the
germination faster. the embryos germination was (80%) and (60%) for M1 and M2,
respectively.
Investigate studied the activity of some enzymes in zea maize plant seedlings
cells, (Ghota 82) under the influence of phytohormone Auxin & growth
regulators 2,4-D and IBA.
Maize plant seeds were germinated in water medium for six days in
darknes
s and temperature of 260C.
Then stem cells of the developing seedling were incupated in darkness with
water or in different solutions of auxin, 2,4-D & IBA (50 mg/l) for 20 houre in
30 0C. Then magared the activity of α-Amylase, RNAase, Catalayse, Guaiacol
Peroxidase, Ascorbate oxidase in the stem cells
The results showed that the incupation has defferent effects.on hydrolysis
and oxidative enzymes in zea maize plant seedlings cells.
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