Synthesis and Characterization of Dimmer-Acid-Based Nonisocyanate Polyurethane and Epoxy Resin Composite

He, Xin; Xu, Xiaoling; Qian, Wensheng; Bo, Guangxu; Yan, Yunjun

doi:10.3390/polym9120649

Cited by 23 publications

(11 citation statements)

References 35 publications

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“…It is difficult to compare the water retention results from this study with the published literature due to the scarcity of published data. The processed PLA exhibited a very low WR % (<0.35%), which is less than polyesters and polyester-based composites [ 31 ], and various types of polyurethane (1–6% after 24 h) [ 32 ] proposed for thermal insulation applications. The low WR % of PLA is attributed to its hydrophobic characteristics [ 33 ] which make it a potential candidate for thermal insulation.…”

Section: Resultsmentioning

confidence: 99%

Thermal Insulation and Mechanical Properties of Polylactic Acid (PLA) at Different Processing Conditions

et al. 2020

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This work aims to provide an extensive evaluation on the use of polylactic acid (PLA) as a green, biodegradable thermal insulation material. The PLA was processed by melt extrusion followed by compression molding and then subjected to different annealing conditions. Afterwards, the thermal insulation properties and structural capacity of the PLA were characterized. Increasing the annealing time of PLA in the range of 0–24 h led to a considerable increase in the degree of crystallization, which had a direct impact on the thermal conductivity, density, and glass transition temperature. The thermal conductivity of PLA increased from 0.0643 W/(m·K) for quickly-cooled samples to 0.0904 W/(m·K) for the samples annealed for 24 h, while the glass transition temperature increased by approximately 11.33% to reach 59.0 °C. Moreover, the annealing process substantially improved the compressive strength and rigidity of the PLA and reduced its ductility. The results revealed that annealing PLA for 1–3 h at 90 °C produces an optimum thermal insulation material. The low thermal conductivity (0.0798–0.0865 W/(m·K)), low density (~1233 kg/m3), very low water retention (<0.19%) and high compressive strength (97.2–98.7 MPa) in this annealing time range are very promising to introduce PLA as a green insulation material.

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Section: Resultsmentioning

confidence: 99%

Thermal Insulation and Mechanical Properties of Polylactic Acid (PLA) at Different Processing Conditions

et al. 2020

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“…Although, according to Leitsch et al, the presence of free isocyanates is avoided during the adhesive application, they still participate in the early stages of the synthesis. In this sense, the preparation of PHU hybrids with epoxy [210,211], polyhedral oligomeric silsesquioxane [212] and amide [213] groups appears to provide a safer way to tailor the PHU properties while preventing the use of isocyanates. More interestingly, Wang et al [214] completely averted pendant hydroxyl groups in NIPU's chemical structure by the reaction between diamines and monocyclic carbonates, and further esterification with dicarboxylic acids, as shown in Fig.…”

Section: Non-isocyanate Polyurethanesmentioning

confidence: 99%

A Review of the Sustainable Approaches in the Production of Bio-based Polyurethanes and Their Applications in the Adhesive Field

2020

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On account of the irreversible environmental damage caused by the utilization of non-renewable raw materials in industrial production, since the end of the twentieth century, the interest in replacing the traditionally applied petroleum-based starting compounds in the polyurethane production by more sustainable feedstocks has grown enormously. Such pursuit of Green Chemistry has been fostered by the implementation of a set of national and international initiatives and stricter regulations, especially in the field of adhesives. In this respect, the latest advances in the production of bio-based polyurethanes are collected in this review. Thus, after a brief introduction to this subject and main tendencies towards the production of more sustainable polyurethanes, the first section reviews the feasibility of manufacturing polyurethanes from a range of natural platforms, including lignocellulosic biomass and vegetable oils, whether modified or in their original form, along with some industrial wastes. Afterwards, the hitherto considered synthetic routes for the preparation of greener polyurethanes are assessed, encompassing waterborne, radiation-curable and non-isocyanate polyurethane techniques. Finally, the last section focuses on the research advancement on the synthesis, properties and different uses of bio-based polyurethanes specifically implemented in the field of adhesives.

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“…With the growing expansion of electrical equipment applications, the disadvantages of the Epoxy Resin (EP) insulating materials such as Diglycidyl Ether of Bisphenol A resin/Methyltetrahydrophthalic Anhydride (DGEBA/MTHPA) have become increasingly obvious. Some of the properties, including mechanical and thermal properties, are often not able to meet the ever-increasing requirements of electrical equipment [1,2,3,4]; while, the emergence of nanomaterials and the development of nanotechnology in recent years have provided new ways to improve the comprehensive properties of EP [5,6]. Compared with traditional materials, the distinguishing structure of nanomaterial has provided a set of unique features, such as the small size effect, quantum size effect and surface effect [7,8], which further enhance the performance in various aspects of physics and chemistry.…”

Section: Introductionmentioning

confidence: 99%

Micro-Structure and Thermomechanical Properties of Crosslinked Epoxy Composite Modified by Nano-SiO2: A Molecular Dynamics Simulation

Xie

Liang

et al. 2018

Polymers

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Establishing the relationship among the composition, structure and property of the associated materials at the molecular level is of great significance to the rational design of high-performance electrical insulating Epoxy Resin (EP) and its composites. In this paper, the molecular models of pure Diglycidyl Ether of Bisphenol A resin/Methyltetrahydrophthalic Anhydride (DGEBA/MTHPA) and their nanocomposites containing nano-SiO 2 with different particle sizes were constructed. The effects of nano-SiO 2 dopants and the crosslinked structure on the micro-structure and thermomechanical properties were investigated using molecular dynamics simulations. The results show that the increase of crosslinking density enhances the thermal and mechanical properties of pure EP and EP nanocomposites. In addition, doping nano-SiO 2 particles into EP can effectively improve the properties, as well, and the effectiveness is closely related to the particle size of nano-SiO 2 . Moreover, the results indicate that the glass transition temperature (T g ) value increases with the decreasing particle size. Compared with pure EP, the T g value of the 6.5 Å composite model increases by 6.68%. On the contrary, the variation of the Coefficient of Thermal Expansion (CTE) in the glassy state demonstrates the opposite trend compared with T g . The CTE of the 10 Å composite model is the lowest, which is 7.70% less than that of pure EP. The mechanical properties first increase and then decrease with the decreasing particle size. Both the Young's modulus and shear modulus reach the maximum value at 7.6 Å, with noticeable increases by 12.60% and 8.72%, respectively compared to the pure EP. In addition, the thermal and mechanical properties are closely related to the Fraction of Free Volume (FFV) and Mean Squared Displacement (MSD). The crosslinking process and the nano-SiO 2 doping reduce the FFV and MSD value in the model, resulting in better thermal and mechanical properties.

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Synthesis and Characterization of Dimmer-Acid-Based Nonisocyanate Polyurethane and Epoxy Resin Composite

Cited by 23 publications

References 35 publications

Thermal Insulation and Mechanical Properties of Polylactic Acid (PLA) at Different Processing Conditions

Thermal Insulation and Mechanical Properties of Polylactic Acid (PLA) at Different Processing Conditions

A Review of the Sustainable Approaches in the Production of Bio-based Polyurethanes and Their Applications in the Adhesive Field

Micro-Structure and Thermomechanical Properties of Crosslinked Epoxy Composite Modified by Nano-SiO2: A Molecular Dynamics Simulation

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