Design of natural fiber composites utilizing interfacial crystallinity and affinity

Koschek, Katharina

doi:10.1016/j.compositesa.2014.10.021

Cited by 20 publications

(12 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Mechanical property of natural fiber‐reinforced polymer composites has attracted considerable attention in recent years . Mechanical properties of fiber‐reinforced polymer matrix composites are largely depends on the quality of bonding between the fiber and matrix , strong adhesion between natural fiber and matrix leads to improved load transfer from the matrix to the fiber which results in greater composite stiffness and strength. In contrast, a weak fiber/matrix interface will provide lower composite strength .…”

Section: Introductionmentioning

confidence: 99%

Cellulose microcrystal improved interphase of ramie fiber‐reinforced epoxy resin composites

et al. 2017

View full text Add to dashboard Cite

This article investigated the effect of cellulose microcrystal (CMC) and low molecular polyamide (PA650) on the mechanical and water absorption properties of ramie fiber‐reinforced epoxy composites. Results showed that coating mixture of CMC and PA650 (CMC/PA650) on the surface of ramie fiber improved the interfacial adhesion strength of ramie fiber/epoxy composites. As a result, the flexural strength, flexural modulus, and interlaminar shear strength of PA650/CMC‐coated ramie fabric‐reinforced epoxy composites (CPRFC) were 10.6%, 8.1%, and 7.4% higher than those of ramie fabric without coating reinforced epoxy composites (RFC). Additionally, saturated water absorption of CPRFC was reduced by 40.5% and 31.5% than that of RFC and PRFC, it seems that a water‐resistant interphase exists in the CPRFC and it is more efficient at the early stage of water immersion. However, without filling of CMC in PA650, lowest flexural modulus and highest flexural strain of the composites were found. POLYM. COMPOS., 39:E2207–E2216, 2018. © 2017 Society of Plastics Engineers

show abstract

Section: Introductionmentioning

confidence: 99%

Cellulose microcrystal improved interphase of ramie fiber‐reinforced epoxy resin composites

et al. 2017

View full text Add to dashboard Cite

show abstract

“…This strain‐induced crystallization results in enhanced strength of the elastomeric material . The occurrence of crystallinity in thermosetting polymers has rarely been discussed in the literature …”

Section: Introductionmentioning

confidence: 99%

Control of reaction mechanisms in cationically polymerized epoxy resins facilitates the adjustment of morphology and mechanical properties

Arnebold

Plander

Thiel

et al. 2016

J. Polym. Sci. Part B: Polym. Phys.

View full text Add to dashboard Cite

Structure–property relations of cationically polymerized epoxy thermosets with different morphologies are examined. The morphology adjustment of amorphous epoxy based copolymers and partially crystalline polymer alloys is carried out with star-shaped poly(ε-caprolactone) (SPCL) bearing various numbers of hydroxyl end groups. These hydroxyl groups are known for their reactivity toward epoxides following the activated monomer (AM) mechanism. For this reason, four-armed SPCL was synthesized with four hydroxyl end groups (SPCL-tetraol) and, in addition, with successively esterified ones down to a SPCL with four ester end groups (SPCL-tetraester). SPCL species bearing fewer or no hydroxyl end groups segregate into needle-like nanodomains within the epoxy networks and, if the concentration is high enough, also into crystalline domains. The stronger phase separation of SPCL-tetraester within the epoxy network compared with SPCL-tetraol is due to a reduction of the AM mechanism. The mechanical properties resulting from different morphologies lead to a trade-off between higher storage moduli and Tg values in the case of the more phase separated (and partially crystalline) polymer alloys and higher strain at break in the case of the amorphous copolymers. Nevertheless, in both cases toughness is improved or at least kept on the same level as for the pure epoxy resin

show abstract

“…Nevertheless, epoxy resins are usually brittle materials, and numerous studies are still dedicated to the improvement of their mechanical properties. Several toughening strategies have been investigated, including nanostructuring, the incorporation of rubber and inorganic fillers, twin copolymerization, and recently the adjustment of crystallinity by partially crystalline polyesters . In the last case, polyester polyols are incorporated into the network during the cationic polymerization of an epoxy resin and partly segregate into small amorphous or crystalline domains by reaction‐induced phase separation .…”

Section: Introductionmentioning

confidence: 99%

Covalent integration of differently structured polyester polyols improves the toughness and strength of cationically polymerized, amorphous epoxy networks

Arnebold

Wellmann²,

Hartwig

2016

J of Applied Polymer Sci

View full text Add to dashboard Cite

The structure–property relationship of polyester polyols in cationically polymerized, amorphous epoxy-based copolymers is investigated. An epoxy resin is polymerized in the presence of structurally different polyesters. These resulting copolymers show improved tensile strength and toughness. The optimal epoxide/polyester ratio depends on the structure of the polyesters. Poly(d-valerolactone)(PVL) reveals the highest ester group density of the investigated polyesters, which enhances physical interactions with the epoxide during polymerization as well as in the network. Furthermore, PVL leads to outstanding tensile strength, strain at break, and toughness. Among all polyester polyols examined, PVL leads to the highest gel fraction or, in other words, the most complete integration into the epoxy network. This work shows that polyesters that are present in the reactive system should be covalently integrated into the polymer network as completely as possible to obtain good mechanical properties of the amorphous copolymer

show abstract

Design of natural fiber composites utilizing interfacial crystallinity and affinity

Cited by 20 publications

References 26 publications

Cellulose microcrystal improved interphase of ramie fiber‐reinforced epoxy resin composites

Cellulose microcrystal improved interphase of ramie fiber‐reinforced epoxy resin composites

Control of reaction mechanisms in cationically polymerized epoxy resins facilitates the adjustment of morphology and mechanical properties

Covalent integration of differently structured polyester polyols improves the toughness and strength of cationically polymerized, amorphous epoxy networks

Contact Info

Product

Resources

About