The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform

Noëlle Billon - One of the best experts on this subject based on the ideXlab platform.

  • Strain-induced crystallization of poly(ethylene 2,5-furandicarboxylate). Mechanical and crystallographic analysis
    Polymer, 2020
    Co-Authors: Emilie Forestier, Christelle Combeaud, Nathanaël Guigo, Gabriel Monge, Jean-marc Haudin, Nicolas Sbirrazzuoli, Noëlle Billon
    Abstract:

    Poly(ethylene 2,5-furandicarboxylate), referred to as PEF, was uni-axially stretched for temperatures above glass transition temperature. This Bio-Based Polymer is considered as a serious competitor for the petroleum analogous poly(ethylene terephthalate), named PET. To replace PET in bottle forming, PEF has to be deformed to large strains which are only reachable when it is in its rubbery state. In the present work, the stretching conditions have been chosen by determining precisely the range of temperature and strain rate where PEF exhibits a rubbery-like state. This was feasible through the building of a master curve at a reference temperature. Local strain field measurements allow the description of PEF intrinsic mechanical behaviour. Above a draw ratio of around 6 to 8, the mechanical response presents an impressive strain hardening whereas a well-defined crystalline phase with a high orientation is formed. Diffraction peaks were indexed and compared to previous papers. Only one crystalline phase was observed either under mechanical loading or during static crystallization. Mechanical loading significantly speeds up crystallization.

Agnieszka Tercjak - One of the best experts on this subject based on the ideXlab platform.

  • Reactive extrusion of Bio-Based Polymer blends and composites – Current trends and future developments
    Express Polymer Letters, 2018
    Co-Authors: Krzysztof Formela, L. Zedler, Aleksander Hejna, Agnieszka Tercjak
    Abstract:

    Reactive extrusion is a cost-effective and environmentally-friendly method to produce new materials with enhanced performance properties. At present, reactive extrusion allows in-situ Polymerization, modification/functionalization of Polymers or chemical bonding of two (or more) immiscible phases, which can be carried out on commonly used extrusion lines. Although reactive extrusion has been known for many years, its application for processing of Bio-Based Polymer blends and composites is a relatively new direction of scientific research. This work presents a literature review on recent advances in the processing of Bio-Based Polymer blends and composites via reactive extrusion. We described compatibilization mechanisms for different types of biodegradable Polymeric materials based on: (i) aliphatic polyesters, (ii) aliphatic polyesters/starch and (iii) aliphatic polyester/natural rubber systems. A special attention was focused on conventional and dynamic cross-linking of Bio-Based Polymer blends and composites as an effective way to prepare new materials with unique properties e.g. biodegradable thermoplastic elastomers or shape-memory materials. Advantages and limitations affecting future trends in development of biodegradable Polymer blends and composites reactive extrusion are also discussed.

Chad A Ulven - One of the best experts on this subject based on the ideXlab platform.

  • study on interfacial properties of unidirectional flax vinyl ester composites resin manipulation on vinyl ester system
    Journal of Applied Polymer Science, 2013
    Co-Authors: Venkata S Chevali, Chad A Ulven
    Abstract:

    Flax fibers are widely used as reinforcements in Bio-Based Polymer matrix composites. This study investigated the hydrophilic nature and surface purity of flax fiber that affects fiber/matrix adhesion in combination with hydrophobic structural Polymers via matrix modification and the utilization of fiber treatment, specifically in a flax/vinyl ester (VE) composite. A new method to manipulate the vinyl ester system with acrylic resin (AR) was developed to produce flax reinforced. On the other hand, different types of chemical and physical treatments were applied on the flax fiber. FTIR was applied to evaluate the effects of surface treatments. Dynamic mechanical analysis (DMA) was used to analyze the unmodified and modified VE resin system. The surface of untreated and treated flax fibers and their composites were analyzed by scanning electronic microscopy (SEM). Sodium ethoxide-treated flax/ VE with 1% (wt) AR caused the best mechanical performance among all the flax/VE composites evaluated.

  • study on interfacial properties of unidirectional flax vinyl ester composites resin manipulation on vinyl ester system
    Journal of Applied Polymer Science, 2013
    Co-Authors: Venkata S Chevali, Chad A Ulven
    Abstract:

    Flax fibers are widely used as reinforcements in Bio-Based Polymer matrix composites. This study investigated the hydrophilic nature and surface purity of flax fiber that affects fiber/matrix adhesion in combination with hydrophobic structural Polymers via matrix modification and the utilization of fiber treatment, specifically in a flax/vinyl ester (VE) composite. A new method to manipulate the vinyl ester system with acrylic resin (AR) was developed to produce flax reinforced. On the other hand, different types of chemical and physical treatments were applied on the flax fiber. FTIR was applied to evaluate the effects of surface treatments. Dynamic mechanical analysis (DMA) was used to analyze the unmodified and modified VE resin system. The surface of untreated and treated flax fibers and their composites were analyzed by scanning electronic microscopy (SEM). Sodium ethoxide-treated flax/ VE with 1% (wt) AR caused the best mechanical performance among all the flax/VE composites evaluated.

Xiaofeng Sui - One of the best experts on this subject based on the ideXlab platform.

  • Bio-Based Polymer colorants from nonaqueous reactive dyeing of regenerated cellulose for plastics and textiles.
    Carbohydrate polymers, 2018
    Co-Authors: Jiangbin Zhao, Lei Ding, Zhiping Mao, Yi Zhong, Linping Zhang, Xiaofeng Sui, Zhize Chen, Bijia Wang
    Abstract:

    A general way to prepare Bio-Based Polymer colorant by reactive dyeing of regenerated cellulose (RC) in dimethyl sulfoxide (DMSO) was established. Up to 40% higher dye utilization was achieved compared with aqueous reactive dyeing of RC for two reasons. 1. Lower liquor ratio of 1:9 could be applied for the concentrated RC suspensions in DMSO was less viscous. 2. Dye loss from solvolysis was turned off in DMSO. The method was generally applicable to RCs made from wood pulp, waste cotton, and bamboo pulp. The dyeing process has minimum influence on the morphological, rheological, and thermal properties of RC. The colored RCs thus prepared were used to prepare colored Polymer composites via a Pickering emulsion approach, and to color cotton, cotton blend, and viscose fabrics via a printing approach. Therefore, it holds great potential as renewable and biodegradable pigments for making colorful composites, ink, textile dyeing and finishing.

  • A waterborne Bio-Based Polymer pigment: colored regenerated cellulose suspension from waste cotton fabrics
    Cellulose, 2018
    Co-Authors: Lei Ding, Jiang Yang, Bijia Wang, Zhiping Mao, Yi Zhong, Linping Zhang, Xiaofeng Sui
    Abstract:

    Waterborne Bio-Based Polymer pigments are promising environmentally friendly coloring materials. In this work, novel colored cellulose suspensions applicable for coloring, labelling and anti-counterfeiting were prepared from waste cotton fabrics. It was demonstrated that cellulose regenerated from a phosphoric acid solution of waste cotton fabrics could be conveniently colored by reacting with reactive dyes. The high specific surface area of the regenerated cellulose (RC) allowed for high color build-up of up to 210 mg/g dye fixation and K/S value of up to 31. The resulting colored regenerated cellulose (CRC) suspension had typical characteristics of regenerated cellulose and was used to color polyurethane (PU). The resulting colored PU films exhibited excellent color fastness/resistance to leaching when soaked in water. This study demonstrated a way of alleviating the environmental burden of waste cotton fabrics by converting them to high value-added colored waterborne cellulose suspension. Preparation and application of CRC suspensions from waste cotton fabrics

Emilie Forestier - One of the best experts on this subject based on the ideXlab platform.

  • Strain-induced crystallization of poly(ethylene 2,5-furandicarboxylate). Mechanical and crystallographic analysis
    Polymer, 2020
    Co-Authors: Emilie Forestier, Christelle Combeaud, Nathanaël Guigo, Gabriel Monge, Jean-marc Haudin, Nicolas Sbirrazzuoli, Noëlle Billon
    Abstract:

    Poly(ethylene 2,5-furandicarboxylate), referred to as PEF, was uni-axially stretched for temperatures above glass transition temperature. This Bio-Based Polymer is considered as a serious competitor for the petroleum analogous poly(ethylene terephthalate), named PET. To replace PET in bottle forming, PEF has to be deformed to large strains which are only reachable when it is in its rubbery state. In the present work, the stretching conditions have been chosen by determining precisely the range of temperature and strain rate where PEF exhibits a rubbery-like state. This was feasible through the building of a master curve at a reference temperature. Local strain field measurements allow the description of PEF intrinsic mechanical behaviour. Above a draw ratio of around 6 to 8, the mechanical response presents an impressive strain hardening whereas a well-defined crystalline phase with a high orientation is formed. Diffraction peaks were indexed and compared to previous papers. Only one crystalline phase was observed either under mechanical loading or during static crystallization. Mechanical loading significantly speeds up crystallization.