Multiple actions of poly(ethylene octene) grafted with glycidyl methacrylate on the performance of poly(lactic acid)

Wang, Xianzeng; Mi, Jianguo; Wang, Jie; Zhou, Hongfu; Wang, Xiangdong

doi:10.1039/c8ra07510g

Cited by 27 publications

(25 citation statements)

References 64 publications

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“…where H m(PLA) is the melting enthalpy of PLA, H cc(PLA) is the cold crystallization enthalpy of PLA, and H • m(PLA) is the melting enthalpy of 100% crystalline PLA that is 93 J/g (Wang et al, 2018), wt (PLA) is the weight fraction of PLA in the blends.…”

Section: Thermal Characterizationmentioning

confidence: 99%

“…melting endotherm peak; this suggests that the PLA is almost in the amorphous state (Ishida et al, 2009) as confirmed by the PLA crystallinity content percentage reported in Table 5. However, the addition of PBAT and POE-g-GMA enables the crystallization ability of PLA encouraging the mobility of PLA molecular chains; as a consequence a slightly increase in the PLA crystallinity content is registered (Jiang et al, 2006;Arruda et al, 2015;Wang et al, 2018).…”

Section: First Screening On Binary and Ternary Blendsmentioning

confidence: 99%

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Thermal, Mechanical and Micromechanical Analysis of PLA/PBAT/POE-g-GMA Extruded Ternary Blends

et al. 2020

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In order to toughen Poly(lactic) acid and binary blends with low PBAT content while maintaining a high biodegradability of the final material, poly(lactic) acid (PLA)/poly(butylene-adipate-co-terephthalate) (PBAT)/ polyolefin elastomer grafted with glycidyl methacrylate (POE-g-GMA) extruded ternary blends have been investigated in this work from a thermal, mechanical, and rheological point of view. The two elastomers have been added in different amounts as dispersed phases into the PLA matrix, paying attention to the final objective: the design of a 90% biodegradable formulation according to EN 13432. These ternary blends exhibited improved impact properties but still low elongation at break. Consequently, to the ternary composition with the best compromise of PLA quantity, biodegradability and thermo-mechanical properties (81 wt.% PLA, 9 wt.% PBAT, and 10 wt.% POE-g-GMA) a small quantity (10 wt.%) of a biobased plasticizer was added in order to further increase the impact properties in parallel with the tensile flexibility. Two types of plasticizers were investigated, one not reactive [Acetyl Tributyl Citrate (ATBC)], and one reactive [Glycidyl ether (EJ-400)]. A micromechanical study, in order to investigate the toughening mechanism of these systems, was carried out on the final formulations. They were also examined by dilatometric tests and elastoplastic fracture mechanics correlating the data obtained to the morphology and to the rheological properties. In conclusion, the best compromise between impact, tensile properties and biodegradability content was achieved using the reactive plasticizer (EJ-400) whose interaction with the matrix is confirmed by the FT-IR analysis.

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Section: Thermal Characterizationmentioning

confidence: 99%

Section: First Screening On Binary and Ternary Blendsmentioning

confidence: 99%

Thermal, Mechanical and Micromechanical Analysis of PLA/PBAT/POE-g-GMA Extruded Ternary Blends

et al. 2020

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“…In the high‐frequency field, fast relaxations of active chains are observed; [ 37 ] in the field of low frequencies the slow relaxation of the dangling chains [ 11,38 ] and of the locked chains, according to the proposed model.…”

Section: Results and Modelsmentioning

confidence: 99%

Entanglement Locking in the Unique Elasticity of Polydimethylsiloxane Rubbers

Villani

Lavallata

2020

Macro Chemistry & Physics

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/macp.201900497. * η for the nanosuspensions.In the following article, [10] the authors demonstrated that a homologous liquid blend based on short and long PDMS chains behaves as if long chains moved within rigid tubes in which the entanglement sites were stabilized by the adsorption of the short chains on entanglement site (Entanglement Locking model). In contrast, the pure component based on long PDMS chains follows the expected tube dilation model. In the present work the entanglement locking model for polymer melt will be extended to the rubber network.The rubber elasticity theory was developed starting from the phantom-chain model of the pioneering works of James and Guth, [12,13] to the Flory random-coil model [14,15] in which the crosslinked active chains are considered isolated. In the Allegra and Ronca [16] and Flory [17] models, the phantom chains network presents the crosslink bound by a harmonic potential in order to take into account the entanglement constraints on the active chains. Therefore, Edwards [18] applied the ideas of the tube model to the rubber network: the crosslinked chains The viscoelasticity behavior of the polydimethylsiloxane (PDMS) rubber blends of high molecular weight polymers modified by low molecular weight agents is studied in compression mode by stress-strain curves, the creep and step-strain, and dynamic-mechanical experiments. The strain spectra highlight the dynamics of active chains at high frequencies and of dangling ends in the low frequencies field. At low deformation, the blending agent enhances the elastic properties by increasing the density of the active chains in the rubber network, in agreement with the classical theories of elasticity. At high deformation, in analogy with the rheological studies on similar liquid blends, the Entanglement Locking model is proposed: the short chains of the blending agent are adsorbed on entanglement sites of long dangling chains, giving effective crosslinks via high entropy dynamics. In this way, the longterm entanglement locking enhances the density of active chains and elastic behavior. At high deformation, the entanglement locking model enriches the rubber elasticity theories according to the tube network model and Mooney-Rivlin equation. The models herein and the possibility they offer for improving rubber viscoelasticity are valuable for the development of polymer physics and technology.

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“…Since the lactic acid molecule has an asymmetric carbon atom, it has optical rotation. However, due to the poor chemical regularity of PLA [10], its relatively low thermal stability, inherent brittleness, low toughness, and low crystallinity [11] limit its further application and development [12][13][14]. Therefore, it is necessary to modify PLA to expand its practical application in various fields.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the cold crystallization temperature of the chain extended PLA (CPLA)/HG was higher 8.2°C than that of PLA and the viscoelasticity of PLA was improved, which due to the formation of branching structure and the interaction between CPLA and HG. Wang et al [10] used poly (ethylene octene) grafted with glycidyl methacrylate (POE-g-GMA) to improve rheological, thermal properties, toughness, and foaming properties of PLA through chain extension. The results showed that the dynamic rheology of PLA was significantly improved, the cold crystallization temperature of PLA decreased by more than 10°C, and the impact strength increased by more than 4 times, which was caused by the chain extension reaction between PLA and POE-g-GMA.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Graphene Oxide-Polystyrene Graft Polymer Based on Reversible Addition Fragmentation Chain Transfer and Its Effect on Properties, Crystallization, and Rheological Behavior of Poly (Lactic Acid)

Yang

Zhen

2020

Advances in Polymer Technology

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Graphene oxide-polystyrene graft polymer (SGO-PS) was prepared by reversible addition-fragmentation chain transfer radical polymerization method. Orthogonal experiments indicated that the optimum synthesis reaction conditions for SGO-PS were as follows: the millimole ratio of chain transfer agent to initiator was 0.15 : 0.3, and the amount of styrene was 8 mL at 80°C for 12 hours. The products were characterized by Fourier transform infrared spectroscopy and thermal weightlessness analysis, and the highest grafting rate of SGO-PS was 62.46%. Then, PLA/SGO-PS nanocomposites were prepared using SGO-PS as fillers by melt intercalation method, and its crystallinity, mechanical properties, and thermal stability were significantly improved. Compared with pure PLA, the crystallinity of PLA/SGO-PS (0.3 wt%) nanocomposites was increased by 5 times. Multiple melting behavior tests showed that the introduction of SGO-PS caused the PLA molecular chain to be discharged into the unit cell in time, and the melting temperature shifted to a higher temperature, which ultimately made the grain structure of PLA composites more complete and stable than pure PLA. The rheological performance test showed that the uniform dispersion of SGO-PS in the PLA matrix inhibited the free movement of the PLA molecular chain and caused higher flow resistance, resulting in an increase in the complex viscosity, storage modulus, and loss modulus of PLA/SGO-PS.

show abstract

Multiple actions of poly(ethylene octene) grafted with glycidyl methacrylate on the performance of poly(lactic acid)

Cited by 27 publications

References 64 publications

Thermal, Mechanical and Micromechanical Analysis of PLA/PBAT/POE-g-GMA Extruded Ternary Blends

Thermal, Mechanical and Micromechanical Analysis of PLA/PBAT/POE-g-GMA Extruded Ternary Blends

Entanglement Locking in the Unique Elasticity of Polydimethylsiloxane Rubbers

Synthesis of Graphene Oxide-Polystyrene Graft Polymer Based on Reversible Addition Fragmentation Chain Transfer and Its Effect on Properties, Crystallization, and Rheological Behavior of Poly (Lactic Acid)

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