Automatic Synthesis of Multimodal Polymers

Leonardi R., Natalie C.; Montgomery, Rick D.; Siqueira, Julia; McAfee, Terry; Drenski, Michael F.; Reed, Wayne F.

doi:10.1002/mren.201600072

Title: Automatic Synthesis of Multimodal Polymers

Journal Article · 07 March 2017 · Macromolecular Reaction Engineering

DOI: https://doi.org/10.1002/mren.201600072 · OSTI ID:1533193

Leonardi R., Natalie C. ^[1]; Montgomery, Rick D. ^[2]; Siqueira, Julia ^[3]; McAfee, Terry ^[4]; Drenski, Michael F. ^[2]; Reed, Wayne F. ^[4]

Advanced Polymer Monitoring Technologies, Inc., New Orleans, LA (United States); DOE/OSTI
Advanced Polymer Monitoring Technologies, Inc., New Orleans, LA (United States)
Tulane Univ., New Orleans, LA (United States); Univ. of Sao Paulo, Lorena (Brazil)
Tulane Univ., New Orleans, LA (United States)

An automatic molecular weight controller is used in semi-batch reactions to produce final polymers that contain distinct subpopulations with different molecular weight distributions (MWD). While blending polymers with different MWD is frequently used to make multimodal polymer products, a method is introduced here allowing the multimodal product to be made in successive, automatically controlled stages in the same reactor. The method is demonstrated using free radical polymerization of acrylamide to produce widely separated multimodal MWD. Automatic Continuous Online Monitoring of Polymerization reactions with a Control Interface (ACOMP/CI) was used. Weight average molecular weight (M_w) in the ACOMP/CI was continuously measured with multi-angle light scattering and ultra-violet absorption. The controller used two principles: both polymerization rate and instantaneous molecular weight are proportional to monomer concentration. By controlling monomer flow rate into the reactor, the controller produced a targeted amount of polymer with a desired first M_w and then automatically introduced chain transfer agent (CTA) into the reactor to produce a second population of polymers with much lower M_w. Subsequently, reactions were performed to produce trimodal populations. Finally, this approach is kindred to multi-stage synthesis of polymers where distinctly different processes are carried out in succeeding stages to produce polymers with highly specific properties.

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Research Organization:: Tulane Univ., New Orleans, LA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF)

Grant/Contract Number:: EE0005776

OSTI ID:: 1533193

Journal Information:: Macromolecular Reaction Engineering, Journal Name: Macromolecular Reaction Engineering Journal Issue: 4 Vol. 11; ISSN 1862-832X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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