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3.457 Aktuelle Fachpublikationen zum Thema temperature

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The effect of controlled degradation on the molecular characteristics of heterophasic ethylene–propylene copolymers

13.12.2014 | Morne Swart, Albert J. Van Reenen, Journal of Applied Polymer Science, 2014

ABSTRACT A commercial heterophasic ethylene–propylene copolymer (HEPC) produced by Sasol Polymers using a Ziegler‐Natta catalysed gas‐phase process was vis‐broken (controlled degradation) to various degrees by making use of an organic peroxide. The effects of the amount of vis‐breaking on the ...

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Polypropylene membranes with the double sensitivity effect

12.12.2014 | Joanna Wolska, Katarzyna Smolinska‐Kempisty, Marek Bryjak, Wojciech Kujawski, Journal of Applied Polymer Science, 2014

ABSTRACT This article describes the modification of polypropylene membranes leading to the preparation of thermo‐ and pH‐sensitive structures. Poly(N‐isopropylacrylamide), poly(acrylic acid), or copolymer poly(N‐isopropylacrylamide‐co‐acrylic acid) was grafted on to the membranes' surface ...

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Property reinforcement of acrylonitrile‐butadiene‐styrene by simultaneous incorporation of carbon nanotubes and self‐prepared copper particles

11.12.2014 | Gen Lin Wang, Lei Duan, Ke Hong Ding, Ming Zhang, Journal of Applied Polymer Science, 2014

ABSTRACT In this article, copper (Cu) crystallites were successfully prepared via low temperature molten salt method, and the possible formation mechanisms were proposed. The conductive fillers of multiwalled carbon nanotubes (MWCNTs) and as‐prepared Cu particles were designed and introduced ...

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Poly‐2‐[(4‐methylbenzylidene)amino]phenol: Investigation of thermal degradation and antimicrobial properties

11.12.2014 | Nuray Yılmaz Baran, Hacı Ökkeş Demir, Sedat Kostekçi, Mehmet Sacak, Journal of Applied Polymer Science, 2014

ABSTRACT A new polyphenol (poly‐2‐[(4‐methylbenzylidene)amino]phenol) (P(2‐MBAP)) containing an azomethine group was synthesized by oxidative polycondensation reaction of 2‐[(4‐methylbenzylidene)amino]phenol (2‐MBAP) with NaOCl, H2O2, and O2 oxidants in an aqueous alkaline medium. The ...

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Time‐dependent exhaust steam temperature profile to mitigate fouling

11.12.2014 | Divya Srivastava, Asia-Pacific Journal of Chemical Engineering, 2014

ABSTRACT In sugar industries, a decrease in the exit liquor concentration is observed because of fouling in multiple‐effect evaporator (MEE) systems, which finally decreases the yield of the MEE system. In the present work, a time‐dependent exhaust steam temperature profile has been developed ...

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Novel temperature‐sensitive and pH‐sensitive polyurethane membranes: preparation and characterization

10.12.2014 | Hu Zhou, Bin Yu, Ruiping Xun, Ning Li, Kejian Wu, Hanzhou Sun, Zhihua Zhou, Asia-Pacific Journal of Chemical Engineering, 2014

ABSTRACT The polyurethane (PU) membranes with temperature and pH double sensitivities for water permeation were designed and prepared from a two‐step solution polymerization from the crystalline polycaprolactone diols (PCL), 4,4′‐diphenylmethane diisocyanate (MDI) and pH‐sensitive ...

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Effects of unsteady expansion/contraction of Wang's cylinder problem with suction near a stagnation point

10.12.2014 | Tariq Javed, Irfan Mustafa, Asia-Pacific Journal of Chemical Engineering, 2014

ABSTRACT The unsteady viscous incompressible stagnation point flow over an expanding/contracting cylinder with heat and mass transfer is studied in this article. The governing partial differential equations are transformed into a couple nonlinear ordinary differential equations by using ...

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Polypropylene random copolymer/MWCNT nanocomposites: Isothermal crystallization kinetics, structural, and morphological interpretations

10.12.2014 | Pawan Verma, Veena Choudhary, Journal of Applied Polymer Science, 2014

ABSTRACT This article describes the crystallization process of polypropylene random copolymer (PPCP) under isothermal conditions in presence of varying amounts of multiwalled carbon nanotubes (MWCNT) ranging from 0.5 to 4.0% w/w. Increase in the crystallization temperature under dynamic ...

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Heterogeneous catalytic synthesis of poly(butylene succinate) by attapulgite‐supported Sn catalyst

10.12.2014 | Shiquan Lai, Yan Gao, Li Yue, Journal of Applied Polymer Science, 2014

ABSTRACT An attapulgite‐supported Sn catalyst (Sn‐palgorskite) was successfully prepared by ion‐exchange co‐impregnation method. The catalytic effect of Sn‐attapulgite on the melt polycondensation reaction of poly(butylene succinate) (PBS) was examined by comparing with that of anhydrous SnCl2 ...

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Main events occurring in styrene microemulsion polymerization

10.12.2014 | J. Esteban López‐Aguilar, René O. Vargas, Carlos E. Escobar‐Toledo, Eduardo Mendizábal, Jorge. E. Puig, Francisco Ló ..., Journal of Applied Polymer Science, 2014

ABSTRACT A previously presented model with four states (conversion, active and inactive particles and micelles) is further tested with conversion versus time experimental data at 50, 60, and 70°C, to recognize the main events occurring in styrene microemulsion polymerization. The S‐shaped ...

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