Macromolecular Reaction Engineering
Copyright © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Materials Science Weekly Newsletter
Recently Published Articles
- Model-Based Production of Polymer Chains Having Precisely Designed End-to-End Gradient Copolymer Composition and Chain Topology Distributions in Controlled Radical Polymerization, A Review
Xiaohui Li, Shaoning Liang, Wen-Jun Wang, Bo-Geng Li, Yingwu Luo and Shiping Zhu
Article first published online: 15 MAY 2015 | DOI: 10.1002/mren.201500012
This article summarizes the recent development and application of the model-based monomer feeding strategies (MMFS) on precise production of polymer chains. With the MMFS method, a series of polymer products with predesigned copolymer composition distributions and chain topologies are successfully synthesized by semi-batch-controlled radical polymerization. Extending MMFS to heterogeneous systems and to continuous polymerization operations are encouraged in future research.
- Kinetic Parameters of the Initiator Decomposition in Microwave and in Conventional Batch Reactors – KPS and V50-Case Studies
Cristiane Costa, André L. Alberton, Alexandre F. Santos, Montserrat Fortuny, Pedro H. H. Araújo, Claudia Sayer and José Carlos Pinto
Article first published online: 13 MAY 2015 | DOI: 10.1002/mren.201500013
This work presents a thorough statistical analysis of parameters used to describe the kinetic rate constants of microwave-assisted decomposition of initiators. The confidence regions of the estimated parameters confirm the difference for microwave and conventional heating. The relation of temperature and volume of hot spots can explain the increase of kinetic rate constants as a thermal effect.
- Stochastic Modeling of Polymer Microstructure From Residence Time Distribution
Tiago Lemos, Príamo A. Melo and José Carlos Pinto
Article first published online: 12 MAY 2015 | DOI: 10.1002/mren.201500007
Microstructure of polymer chains produced in continuous stirred tank and tubular reactors, as calculated with an extended version of the stochastic kMC algorithm, which includes the effect of the residence time distribution on the microstructural polymer properties.
- Novel SiO2-Supported Chromium Oxide(Cr)/Vanadium Oxide(V) Bimetallic Catalysts for Production of Bimodal Polyethylene
Ruihua Cheng, Xin Xue, Weiwei Liu, Ning Zhao, Xuelian He, Zhen Liu and Boping Liu
Article first published online: 12 MAY 2015 | DOI: 10.1002/mren.201400072
A series of SiO2-supported Cr–V bimetallic oxides catalysts were successfully synthesized through introduction of vanadium oxide into the traditional Phillips CrOx/SiO2 catalyst. Using these Cr/V bimetallic catalysts, one-pot synthesis of polyethylene and ethylene/1-hexene copolymers with bimodal MWD and improved short chain branch distribution together with enhancement of catalytic activity was achieved.
- Kinetics and Modeling of Ring-Opening Copolymerization of l-Lactide and ε-Caprolactone
Feiyin Weng, Xiaohui Li, Yanjiao Wang, Wen-Jun Wang and Steven J. Severtson
Article first published online: 27 APR 2015 | DOI: 10.1002/mren.201500009
A model for ring-opening copolymerization of l-lactide and ε-caprolactone based on coordination insertion mechanism, considering diffusion control in propagation and transesterification reactions is developed. It is successfully applied to predict monomer conversion, molecular weight and distribution, and cumulative polymer composition for copolymers with variable compositions as well as variable chain lengths.