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Tunable Hydrophilicity of Poly(ethyl lactate acrylate-co-acrylic acid)

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Four copolymers of poly(ethyl lactate acrylate-co-acrylic acid) were prepared by the solution polymerization technique by varying the comonomer content from 0.2 to 0.8 mole percent. The copolymers were characterized by FT-IR, 1H-NMR and proton decoupled 13C-NMR spectroscopic techniques. The reactivity ratio of ethyl lactate acrylate (ELA) and acrylic acid (AA) was calculated using the Fineman-Ross method and the values were found to be 0.101 and 0.186, respectively, indicating the formation of an alternating copolymer. From the wide-angle X-ray diffraction studies (WAXD), the average molecular interchain spacing () was calculated from the 2 value of amorphous halo at about 20°. The values varied from 5.20 to 5.64 Å and increased with an increase in the ELA content. The water absorption of copolymers followed Fickian absorption. Depending upon the copolymer composition, relative humidity and time, the water absorption of copolymers can be tuned to a wide range from 3 to 35% (w/w). The Tg of copolymers decreased from 106 to –27.4°C with an increase in the ELA content. The copolymers were thermally stable up to 150°C and thereafter exhibited three-step thermal degradation in nitrogen atmosphere. The thermal stability of polymers can be explained on the basis of value.
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Keywords: AVERAGE MOLECULAR INTERCHAIN SPACING; COPOLYMER; HYDROPHILICITY; LACTATE; THERMAL STABILITY

Document Type: Research Article

Publication date: 2015-10-01

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  • The Journal of Renewable Materials (JRM) publishes high quality peer reviewed original research on macromolecules and additives obtained from renewable/biobased resources. Utilizing a multidisciplinary approach, JRM introduces cutting-edge research on biobased monomers, polymers, additives (both organic and inorganic), their blends and composites. It showcases both fundamental aspects and new applications for renewable materials. The fundamental theories and topics pertain to chemistry of biobased monomers, macromoners and polymers, their structure-property relationship, processing using sustainable methods, characterization (spectroscopic, morphological, thermal, mechanical, and rheological), bio and environmental degradation, and life cycle analysis. Demonstration of use of renewable materials and composites in applications including adhesives, bio and environmentally degradable structures, biomedicine, construction, electrical & electronics, mechanical, mendable and self-healing systems, optics, packaging, recycling, shape-memory, and stimulus responsive systems will be presented.
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