نتایج جستجو برای: pet oligomers.

تعداد نتایج: 63221  

Journal: :پژوهش های علوم و صنایع غذایی ایران 0
pages 1-10 k. abrari p. zandi m. ghadiri m.t mazlumi

in iran, the majority of vegetable oil producers , use pet for packaging their products . due to high solubility of pet oligomers in the oils , and shelf life of liquid oils , it is expected that some compounds migrate into the oil . this study was carried out to determine the amount of migration of terephtalates from pet bottles into sunflower oil and the effect of temperature and storage time...

Journal: :AppliedChem 2023

This work is concerned with polyethylene terephthalate (PET) saponification by different potassium compounds in various polyols as well biodiesel’s main by-product, crude glycerol. It was established that reaction conditions (initial PET/K+ molar ratio, time, etc.) could control the molecular weight of obtained oligomeric products. In ethylene glycol, depolymerization proceeds rapidly, and alre...

Journal: :Organic & biomolecular chemistry 2010
Sachin S Gokhale Vaijayanti A Kumar

The N-(pyrrolidin-2-ethyl) glycine-based PNA (pet-PNA) backbone, with 4-amino or 4-guanidino-functionalized pyrrolidine ring, confers constrained conformational flexibility on aegPNA. The oligomers bind to the target DNA and RNA sequences with increased sequence specificity and antiparallel versus parallel orientation selectivity. The easy post-synthetic guanidination gives very good access to ...

Journal: :پژوهش نفت 0

pet wastes from post consumer bottles can be chemically degraded into some compounds such as oligomers and some monomers such as bishydroxy ethyl terephthalate(bhet)by some catalysts(zn, co, pb and mn acetates) in ethylene glycol at 189 oc under n2 atmospheric pressure. the compounds obtained in the chemical depolymerization can be used as plasticizers in paint, fibbers, rubbers and plastic ind...

2013
Ujwala Hujuri Aloke K. Ghoshal Sasidhar Gumma

The present work aims at evaluating temperature dependency of product evolution from pyrolysis of binary mixtures of low density polyethylene (LDPE), and polyethylene terephthalate (PET). Product distribution studies have been reported for three different mixture compositions (20:80, 50:50, and 80:20) in the temperature range of 300-600oC, for a wide range of hydrocarbon products (C5-C44) and t...

Journal: :Angewandte Chemie 2017
Jiangtao Xu Changkui Fu Sivaprakash Shanmugam Craig J Hawker Graeme Moad Cyrille Boyer

Uniform synthetic polymers with precisely defined molar mass and monomer sequence (primary structure) have many potential high-value applications. However, a robust and versatile synthetic strategy for these materials remains one of the great challenges in polymer synthesis. Herein we describe proof-of-principle experiments for a modular strategy to produce discrete oligomers by a visible-light...

H Satake , J Murata , M Sharifi , S Esmaeilzadeh Bahabadi ,

Background: Linum album, a herbaceous and medicinal plant, has been shown to accumulate anti-tumor podophyllotoxin (PTOX) and related lignans. Objective: In this study, we have verified the time-course of cell growth, lignan production in cells treated with chitosan and chitin oligomers. To study mechanism of chitosan and chitin oligomers action, expression of phenylalanine ammonio-lyase (PAL)...

2006
Joan D. Patterson Saad A. Khan George W. Roberts

A single-step, extrusion-based process to depolymerize poly(ethylene terephthalate) (PET) is being investigated. The depolymeriza tion is effected by reacting ethylene glycol (EG) with the high molecular weight polymer (glycolysis). The ethylene glycol causes chain scission by attacking the ester linkages along the polymer backbone. The objective is to recover purified low molecular weight olig...

Journal: :فصلنامه علمی پژوهشی گیاهان دارویی 0
s esmaeilzadeh bahabadi department of biology, faculty of basic sciences, university of zabol, zabol, iran, p.o.box: 98615-538 tel: +98-542- 4822187, fax: +98-542-2226765 m sharifi tarbiat modares university j murata bioorganic research institute h satake bioorganic research institute

background: linum album, a herbaceous and medicinal plant, has been shown to accumulate anti-tumor podophyllotoxin (ptox) and related lignans. objective: in this study, we have verified the time-course of cell growth, lignan production in cells treated with chitosan and chitin oligomers. to study mechanism of chitosan and chitin oligomers action, expression of phenylalanine ammonio-lyase (pal),...

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