Publisher of Iranian Journals and Conference Proceedings

Please waite ..
Publisher of Iranian Journals and Conference Proceedings
Login |Register |Help |عضویت کتابخانه ها
Paper
Title

Online Turbidimetric Monitoring of the Polymerization Process: Early Stages of VDF Polymerizations in Supercritical CO2

دوازدهمین کنگره ملی مهندسی شیمی ایران
Year: 1387
COI: NICEC12_442
Language: EnglishView: 1,149
This Paper With 12 Page And PDF Format Ready To Download

Buy and Download

با استفاده از پرداخت اینترنتی بسیار سریع و ساده می توانید اصل این Paper را که دارای 12 صفحه است به صورت فایل PDF در اختیار داشته باشید.
آدرس ایمیل خود را در کادر زیر وارد نمایید:

Authors

Reza Najja - Department of Organic Chemistry, University of Tabriz, Tabriz, Iran
Jürgen Ellmann - Huntsman Textile Effects GmbH, Rehlingerstr
Uwe Beginn - University of Osnabrück, Institute of Organic Chemistry
Martin Möller - German Wool Research Institute (DWI), Aachen University of Technology (RWTH), Aachen, Germany

Abstract:

Supercritical CO2 (sc-CO2) offers a promising alternative medium for current methods of poly(vinylidene difluoride) (PVDF) production in organic solvents or emulsion polymerizations, eliminating wastewater generation and high energy cost for polymer drying. VDF polymerizations conducted in sc-CO2 are showing an induction period at the beginning of the reaction, which is not yet well understood. In this work, the early stages of VDF polymerizations in sc-CO2 were successfully investigated using online turbidimetric monitoring of the reaction medium. The onset time of turbidity was used to indicate the start of polymerization and to measure induction times. Different trends of turbidity change were observed for the reactions at different temperatures. Average values of 7, 5, 3.5 and 15.5 min were obtained for the onset times of turbidity for polymerizations at 40, 50, 75 and 115 °C, respectively. With increasing of the initiator concentration and reaction temperature at the otherwise the same conditions, the onset time of turbidity were decreased, implying that the higher concentration of the initiating radicals causes faster increase of the polymer particles, and hence faster increase of the reaction medium turbidity. Negligible values of conversions (< 0.05%) at the onset times of turbidity indicated the high sensitivity of the method.

Keywords:

Paper COI Code

This Paper COI Code is NICEC12_442. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/58135/

How to Cite to This Paper:

If you want to refer to this Paper in your research work, you can simply use the following phrase in the resources section:
Najja, Reza and Ellmann, Jürgen and Beginn, Uwe and Möller, Martin,1387,Online Turbidimetric Monitoring of the Polymerization Process: Early Stages of VDF Polymerizations in Supercritical CO2,12th National Iranian Chemical Engineering Congress,Tabriz,https://civilica.com/doc/58135

مراجع و منابع این Paper:

لیست زیر مراجع و منابع استفاده شده در این Paper را نمایش می دهد. این مراجع به صورت کاملا ماشینی و بر اساس هوش مصنوعی استخراج شده اند و لذا ممکن است دارای اشکالاتی باشند که به مرور زمان دقت استخراج این محتوا افزایش می یابد. مراجعی که مقالات مربوط به آنها در سیویلیکا نمایه شده و پیدا شده اند، به خود Paper لینک شده اند :

  • Seiler, D.A; PVDF in the chemical process industry. In: Modern ...
  • Ring, K-L; Kalin, T.; Kishi, A.: F luorop olymers Chemical ...
  • Scheirs, J.; F luoropolymers : technology, markets and trends. Rapra ...
  • Ko chervinskii, V.V.; Danilyuk, T.Y.; Madorskay, L.Y.; Polym. Sci. USSR ...
  • Jo, S.M., Lee, W.S.; Park, S., Ahn, B.S., Park, KY; ...
  • Brothers, P.D.; US Patent, US 6103844 (2000). ...
  • Beginn U., Najjar R. Ellmann J. Vinokur R., Martin R. ...
  • Charpentier, P.A.; DeSimone, J.M.; Roberts, G.W.; Ind. Eng. Chem. Res. ...
  • Roland Martin, Confidential c ommuni cations within ECOPOL project. ...
  • DeSimone, J.M., Wojcinski, L.M.; Kennedy, K.A.; Zannoni, L.; Saraf, M.; ...

Research Info Management

Certificate | Report | من نویسنده این مقاله هستم

اطلاعات استنادی این Paper را به نرم افزارهای مدیریت اطلاعات علمی و استنادی ارسال نمایید و در تحقیقات خود از آن استفاده نمایید.

Scientometrics

The specifications of the publisher center of this Paper are as follows:
Type of center: دانشگاه دولتی
Paper count: 23,237
In the scientometrics section of CIVILICA, you can see the scientific ranking of the Iranian academic and research centers based on the statistics of indexed articles.

New Papers

New Researchs

Share this page

More information about COI

COI stands for "CIVILICA Object Identifier". COI is the unique code assigned to articles of Iranian conferences and journals when indexing on the CIVILICA citation database.

The COI is the national code of documents indexed in CIVILICA and is a unique and permanent code. it can always be cited and tracked and assumed as registration confirmation ID.

Support