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(Natural) polymers

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…
Tuning Mechanical Properties of Biobased Polymers by Supramolecular Chain Entanglement

Lamm, Meghan E.; Song, Lingzhi; Wang, Zhongkai; Rahman, Md Anisur; Lamm, Benjamin; Fu, Lin; Tang, Chuanbing

(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSAXSTechniqueTemperature

Tuning Mechanical Properties of Biobased Polymers by Supramolecular Chain Entanglement

Lamm, Meghan E.; Song, Lingzhi; Wang, Zhongkai; Rahman, Md Anisur; Lamm, Benjamin; Fu, Lin; Tang, Chuanbing

A variety of biobased polymers have been derived from diverse natural resources. However, the mechanical properties of some of these polymers are inferior due to low chain entanglement. We report a facile strategy termed “supramolecular chain entanglement”, which utilizes supramolecular interactions to create physical cross-linking and entanglements for polymers with…
Tunable Fluorophobic Effect Determines Nanoparticle Dispersion in Homopolymers and Block Polymers

Marsh, Zachary M.; Blom, Douglas A.; Stefik, Morgan

(Natural) polymersApplicationCharacterizationCompositesCustomer publicationsMaterialOtherPolymer researchSAXSTechnique

Tunable Fluorophobic Effect Determines Nanoparticle Dispersion in Homopolymers and Block Polymers

Marsh, Zachary M.; Blom, Douglas A.; Stefik, Morgan

The controlled placement of nanoparticles (NPs) within homopolymers and block polymers is of broad interest for functional nanomaterials. This manuscript focuses on small molecule-stabilized NPs that bring a large fraction of functionality. For such NP mixtures with block polymers, the overwhelming focus to date has been the use of attractive…
Enhanced Conductivity via Homopolymer-Rich Pathways in Block Polymer-Blended Electrolytes

Morris, Melody A.; Sung, Seung Hyun; Ketkar, Priyanka M.; Dura, Joseph A.; Nieuwendaal, Ryan C.; Epps, Thomas H.

(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialPhase analysisRenewable energySAXSTechnique

Enhanced Conductivity via Homopolymer-Rich Pathways in Block Polymer-Blended Electrolytes

Morris, Melody A.; Sung, Seung Hyun; Ketkar, Priyanka M.; Dura, Joseph A.; Nieuwendaal, Ryan C.; Epps, Thomas H.

The optimization of ionic conductivity and lithium-ion battery stability can be achieved by independently tuning the ion transport and mechanical robustness of block polymer (BP) electrolytes. However, the ionic conductivity of BP electrolytes is inherently limited by the covalent attachment of the ionically conductive block to the mechanically robust block,…
Comparative Study of Direct Compounding, Coupling Agent-Aided and Initiator-Aided Reactive Extrusion to Prepare Cellulose Nanocrystal/PHBV (CNC/PHBV) Nanocomposite

Zheng, Ting; Clemons, Craig M.; Pilla, Srikanth

(Natural) polymersApplicationCharacterizationCompositesCustomer publicationsMaterialOrientation analysisPolymer researchSAXSTechnique

Comparative Study of Direct Compounding, Coupling Agent-Aided and Initiator-Aided Reactive Extrusion to Prepare Cellulose Nanocrystal/PHBV (CNC/PHBV) Nanocomposite

Zheng, Ting; Clemons, Craig M.; Pilla, Srikanth

Three compounding methods were compared to determine their effects on the organization of the interphase in nanocomposites of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and cellulose nanocrystals (CNCs) processed via (1) direct compounding, (2) reactive extrusion using a coupling agent (PHBV-g-GMA), or (3) reactive extrusion using a peroxide free-radical initiator (dicumyl peroxide,…
Fast Photochromic Dye Response in Rigid Block Polymer Thermosets

Peterson, Colin; Hillmyer, Marc A.

(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSAXSTechnique

Fast Photochromic Dye Response in Rigid Block Polymer Thermosets

Peterson, Colin; Hillmyer, Marc A.

The behavior of photochromic spiropyran (SP) dyes is greatly affected by the local environment in which they reside. Fluid microenvironments such as liquidlike polymers grant favorably fast dye decoloration whereas rigid microenvironments such as glassy polymers inhibit fast dye response. We study the use of disorganized but microphase-separated block polymer…
Structure Evolution and Deformation Behavior of Polyethylene Film during Biaxial Stretching

Chen, Qiang; Wang, Zhiwei; Zhang, Sumei; Cao, Ya; Chen, Jinyao

(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialOrientation analysisPolymer researchSAXSTechnique

Structure Evolution and Deformation Behavior of Polyethylene Film during Biaxial Stretching

Chen, Qiang; Wang, Zhiwei; Zhang, Sumei; Cao, Ya; Chen, Jinyao

The structure evolution and deformation behavior of tenter-frame biaxially oriented polyethylene (TF-BOPE) films were investigated in this study. For sequential biaxial stretching, the original spherulites were broken into small pieces, and the fibrillar structure simultaneously formed during the machine direction (MD) stretching. Subsequently, the single fibrils were pulled away, and…