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Polymer research

Effects of an ionic liquid and processing conditions on the ?-polymorph crystal formation in poly(vinylidene fluoride)

Pickford, Tom; Gu, Xu; L. Heeley, Ellen; Wan, Chaoying

(Natural) polymersApplicationCharacterizationCompositesCrystalline fractionCustomer publicationsMaterialPhase analysisPolymer researchSAXSTechniqueWAXS

Effects of an ionic liquid and processing conditions on the ?-polymorph crystal formation in poly(vinylidene fluoride)

Pickford, Tom; Gu, Xu; L. Heeley, Ellen; Wan, Chaoying

The piezoelectric properties of poly?vinylidene fluoride) (PVDF) are determined by the prevalence and orientation of its polar ?-crystal phase, which can be tuned by processing conditions, additives, mechanical stretching or post-treatment. Here, the effects of three types of processing conditions on the crystalline structure evolution of PVDF were investigated; electrospinning,…
Supramolecular luminescent triblock copolymer thermoplastic elastomer via metal-ligand coordination

Jiang, Feng; Zhang, Xin; Hwang, Wonseok; Briber, Robert M.; Fang, Yanxiong; Wang, Howard

(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSAXSTechnique

Supramolecular luminescent triblock copolymer thermoplastic elastomer via metal-ligand coordination

Jiang, Feng; Zhang, Xin; Hwang, Wonseok; Briber, Robert M.; Fang, Yanxiong; Wang, Howard

We have performed synthesis and testing of novel supramolecular thermoplastic elastomers (TPEs). The polymers incorporate metal-ligand bonds between terbium (Tb3+) ions and imidazole groups in a triblock copolymer poly(isobornyl acrylate)-block-poly(n-butyl acrylate-co-1-vinylimidazole)-block-poly(isobornyl acrylate) (PIBA-b-P(BA-co-VI)-b-PIBA) as a second reversible physical cross-link in…
Ballistic thermal phonons traversing nanocrystalline domains in oriented polyethylene

Robbins, Andrew B.; Drakopoulos, Stavros X.; Martin-Fabiani, Ignacio; Ronca, Sara; Minnich, Austin J.

(Natural) polymersApplicationCharacterizationCompositesCrystalline fractionCustomer publicationsMaterialOtherPolymer researchSAXSTechniqueWAXS

Ballistic thermal phonons traversing nanocrystalline domains in oriented polyethylene

Robbins, Andrew B.; Drakopoulos, Stavros X.; Martin-Fabiani, Ignacio; Ronca, Sara; Minnich, Austin J.

Polymer crystals that are good conductors of heat are highly desirable for thermal management applications. Although thermally conductive polymer crystals are well known, the microscopic thermal transport processes that enable these properties have been challenging to probe experimentally. We used an optical method to probe heat conduction at submicrometer length…
Improvement in mechanical and structural properties of poly(ethylene terephthalate) nanohybrid

Saxena, Dipti; Rana, Dipak; Bhoje Gowd, E.; Maiti, Pralay

(Natural) polymersApplicationCharacteristic dimensionCharacterizationCompositesCustomer publicationsMaterialOrientation analysisPolymer researchSAXSTechnique

Improvement in mechanical and structural properties of poly(ethylene terephthalate) nanohybrid

Saxena, Dipti; Rana, Dipak; Bhoje Gowd, E.; Maiti, Pralay

The wide range of applicability of poly(ethylene terephthalate) (PET) in various fields such as packaging, automobile parts, sports and textile due to its transparent nature, light weight and mechanical properties creates strong case to enhance its mechanical properties. By embedding nanofillers and thereby improving the mechanical properties, this spectrum can…
Pendant side-chain sterics against electrostatic forces: Influencing short-range ordering in random polyelectrolytes

Nwosu, Chinomso; Coughlin, E. Bryan

(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchTechniqueWAXS

Pendant side-chain sterics against electrostatic forces: Influencing short-range ordering in random polyelectrolytes

Nwosu, Chinomso; Coughlin, E. Bryan

The length of pendant side chains in charged, random, comb-shaped polymers dictates the nature of their short-range ordering. Random copolymers, and terpolymer, of 4-vinylpyridine (4VP), styrene, and isoprene were synthesized and subsequently fully quaternized with 1-alkylbromides having varying number of carbons on the alkyl group ranging from 2 to 8.…
Two-Step Chemical Transformation of Polystyrene-block-poly(solketal acrylate) Copolymers for Increasing ?

Yu, Duk Man; Smith, Darren M.; Kim, Hyeyoung; Rzayev, Javid; Russell, Thomas P.

(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialOtherPolymer researchSAXSSelf-assembled materialTechniqueTemperature

Two-Step Chemical Transformation of Polystyrene-block-poly(solketal acrylate) Copolymers for Increasing ?

Yu, Duk Man; Smith, Darren M.; Kim, Hyeyoung; Rzayev, Javid; Russell, Thomas P.

We investigated the two-step chemical transformation of a series of symmetric poly(styrene-b-solketal acrylate) (PS-b-PSA) copolymers with varying molecular weights from 1900 to 27?300 g/mol (13 ? N ? 194) synthesized by sequential atom transfer radical polymerization. Through acid-catalyzed hydrolysis, the PSA block is converted into poly(glycerol acrylate) (PGA), which subsequently…