Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 6, Pages 3379-3387Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b00455
Keywords
Renewable; RAFT; High T-g; Thermoplastic elastomer; Butyl acrylate; 2-Ethylhexyl acrylate
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Funding
- NSF under the Center for Sustainable Polymers [CHE-1413862]
- NSF through the UMN MRSEC program [DMR-1420013]
- E. I. du Pont de Nemours Co.
- Dow Chemical Company
- Northwestern University
- U.S. DOE [DE-AC02-06CH11357]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1413862] Funding Source: National Science Foundation
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A new monomer acetylated acrylic isosorbide (AAI) was prepared in two steps using common reagents without the need for column chromatography. Free radical polymerization of AAI afforded poly(acetylated acrylic isosorbide) (PAAI), which exhibited a glass transition temperature (T-g) = 95 degrees C and good thermal stability (T-d, 5% weight loss; N-2 = 331 degrees C, air = 291 degrees C). A series of ABA triblock copolymers with either poly(n-butyl acrylate) (PnBA) or poly(2-ethylhexyl acrylate) (PEHA) as the low T-g midblocks and PAAI as the high T-g end blocks were prepared using Reversible Addition-Fragmentation chain Transfer (RAFT) polymerization. The triblock copolymers ranging from 8-24 wt % PAAI were evaluated as pressure sensitive adhesives by 180 degrees peel, loop tack, and static shear testing. While the PAAI-PEHA-PAAI series exhibited poor adhesive qualities, the PAAI-PnBA-PAAI series of triblock copolymers demonstrated peel forces up to 2.9 N cm(-1), tack forces up to 3.2 N cm(-1), and no shear failure up to 10 000 min. Dynamic mechanical analysis indicated that PAAI-PEHA-PAAI lacked the dissipative qualities needed to form an adhesive bond with the substrate, while the PAAI-PnBA-PAAI series exhibited a dynamic mechanical response consistent with related high performing PSAs.
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