Block Copolymers via Reverse Addition-Fragmentation Chain Transfer Polymerization as a Viable Resin for Packaging Coatings
| Main Author: | |
|---|---|
| Language: | English |
| Published: |
University of Cincinnati / OhioLINK
2015
|
| Subjects: | |
| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428070054 |
| id |
ndltd-OhioLink-oai-etd.ohiolink.edu-ucin1428070054 |
|---|---|
| record_format |
oai_dc |
| spelling |
ndltd-OhioLink-oai-etd.ohiolink.edu-ucin14280700542021-08-03T06:29:47Z Block Copolymers via Reverse Addition-Fragmentation Chain Transfer Polymerization as a Viable Resin for Packaging Coatings Lascu, Claudia M. Chemistry Bisphenol A type epoxy DDMAT Diblock Copolymers Packaging Coating Synthesis of diblock copolymers of acrylic acid/ ethyl acrylate and of acrylic acid/ methyl methacrylate were performed using reversible addition-fragmentation chain-transfer (RAFT) polymerization with 1-dodecyl-(dimethyl acetic acid) trithiocarbonate (DDMAT) chain transfer agent (CTA). Synthesis of poly(acrylic acid) macro-RAFT agent resulted in a lower degree of polymerization (DP) of 22 compared to the theoretical DP of 100 at 95% conversion. Poly(acrylic acid-b-ethyl acrylate) block copolymer showed poor conversion as well therefore the synthesis of diblock copolymers from acrylic acid was aborted. The main cause for lack of monomer conversion was cited to be from impurities.Synthesis of poly(tert-butyl acrylate) macro-RAFT agent achieved higher degree of polymerization, and provided excellent molecular weight control and dispersity (Ð) for the polymerization of ethyl acrylate and methyl methacrylate. The tert-butyl groups were removed using dilute trifluoroacetic acid affording hydrophilic acrylic acid groups. Both poly(acrylic acid-b-ethyl acrylate) and poly(acrylic acid-b-methyl methacrylate) copolymers showed poor cure response and poor adhesion over aluminum substrate in 1% Joy detergent and 3% acetic acid solutions when compared to an bisphenol A type epoxy resin and bisphenol A free resin control. The adhesion to aluminum substrate was improved of a bisphenol A free polymer when poly(acrylic acid-b-ethyl acrylate) was incorporated rather than poly(acrylic acid-b-methyl methacrylate). Tert-butyl acrylate groups of poly(acrylic acid-b-methyl methacrylate) diblock copolymer were found present via FTIR confirming that not all acrylic acid groups were available to aid adhesion to aluminum substrate. Additionally, poly(acrylic acid-b-ethyl acrylate) improved flavor scalping of a bisphenol A free polymer by 35% and poly(acrylic acid-b-methyl methacrylate) by 2%. This is due to the increase of polarity of the coating when incorporating poly(acrylic acid-b-ethyl acrylate) hence showing less affinity for non-polar components present in beverages. 2015-06-26 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428070054 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428070054 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Chemistry Bisphenol A type epoxy DDMAT Diblock Copolymers Packaging Coating |
| spellingShingle |
Chemistry Bisphenol A type epoxy DDMAT Diblock Copolymers Packaging Coating Lascu, Claudia M. Block Copolymers via Reverse Addition-Fragmentation Chain Transfer Polymerization as a Viable Resin for Packaging Coatings |
| author |
Lascu, Claudia M. |
| author_facet |
Lascu, Claudia M. |
| author_sort |
Lascu, Claudia M. |
| title |
Block Copolymers via Reverse Addition-Fragmentation Chain Transfer Polymerization as a Viable Resin for Packaging Coatings |
| title_short |
Block Copolymers via Reverse Addition-Fragmentation Chain Transfer Polymerization as a Viable Resin for Packaging Coatings |
| title_full |
Block Copolymers via Reverse Addition-Fragmentation Chain Transfer Polymerization as a Viable Resin for Packaging Coatings |
| title_fullStr |
Block Copolymers via Reverse Addition-Fragmentation Chain Transfer Polymerization as a Viable Resin for Packaging Coatings |
| title_full_unstemmed |
Block Copolymers via Reverse Addition-Fragmentation Chain Transfer Polymerization as a Viable Resin for Packaging Coatings |
| title_sort |
block copolymers via reverse addition-fragmentation chain transfer polymerization as a viable resin for packaging coatings |
| publisher |
University of Cincinnati / OhioLINK |
| publishDate |
2015 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428070054 |
| work_keys_str_mv |
AT lascuclaudiam blockcopolymersviareverseadditionfragmentationchaintransferpolymerizationasaviableresinforpackagingcoatings |
| _version_ |
1719437968319447040 |