Synthesis of nonionic polyurethanes with hydroxyl-terminated polybutadiene hydrophobic segments and their application in octadecane nanocapsules

Liu, Yao; Wei, Yuezhou; Zong, Cheng

doi:10.1007/s00396-013-3131-6

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…Hydroxyl-terminated polybutadiene (HTPB) and modified HTPB are important telechelic liquid rubbers that are widely used in the binder system of composite solid propellants. − Because of its unique properties, such as hydrolytic stability, resistance to aqueous acids and bases, adhesion to a variety of substrates, high processability with high solid loading, low-temperature flexibility, electrical insulation properties, and high elongation with good elastic recovery, HTPB is widely used not only in propellant applications but also in other areas, such as membranes, adhesives, coating, sealants, newer materials, etc. The reactive functional groups in the terminated liquid rubber could also be applied to build ABA triblock copolymers, − toughened resins, , elastomers, − cross-linked elastomers, and supermolecular polymer gels. − …”

Section: Introductionmentioning

confidence: 99%

Preparation of Hydroxyl-Terminated Polybutadiene with High Cis-1,4 Content

Zhou

Jie

2014

Ind. Eng. Chem. Res.

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Hydroxyl-terminated polybutadiene (HTPB) with high cis-1,4 content (>95.0%) has been prepared via a two-step method by taking commercial butadiene rubber (BR9000) as a starting material, including the one-pot synthesis of aldehydegroup-terminated polybutadiene (ATPB) in high efficiency and the subsequent reduction reaction. The double bonds distributed in linear polybutadiene were first epoxidized and then cleaved at the exact epoxidized sites. The epoxidation reaction by 3-chloroperbenzoic acid and chain-cleavage reaction by periodic acid are controllable, highly efficient, selective, and quantitative. Along with an epoxy percent increase, the molecular weight of ATPB prepared via a one-pot method decreased with a relatively narrow polydispersity index. The aldehyde groups in the chain ends were reduced by NaBH 4 to produce HTPB, in which the high cis-1,4 content of BR was retained. INTRODUCTIONHydroxyl-terminated polybutadiene (HTPB) and modified HTPB are important telechelic liquid rubbers that are widely used in the binder system of composite solid propellants. 1−6 Because of its unique properties, such as hydrolytic stability, resistance to aqueous acids and bases, adhesion to a variety of substrates, high processability with high solid loading, lowtemperature flexibility, electrical insulation properties, and high elongation with good elastic recovery, 7 HTPB is widely used not only in propellant applications but also in other areas, such as membranes, adhesives, coating, sealants, newer materials, etc. The reactive functional groups in the terminated liquid rubber could also be applied to build ABA triblock copolymers, 8−10 toughened resins, 11,12 elastomers, 13−17 cross-linked elastomers, 18 and supermolecular polymer gels. 19−21 It is well-known that the properties of HTPB are greatly affected by its chain microstructures. 7 Lower 1,2-vinyl content will lead to lower viscosity of HTPB, and the mechanical properties, such as tensile strength and elongation at break, are enhanced with an increase in the 1,4 content. Furthermore, the higher the 1,4 content, especially higher cis-1,4 content, the lower the glass transition temperature and the better the lowtemperature flexibility. 22 Thus, because of its lower viscosity, good mechanical and thermal properties, and low-temperature flexibility, HTPB with high cis-1,4 content might be the best choice for the preparation of new materials with high processability and high elasticity.HTPB was conventionally prepared by free-radical polymerization 23 and anionic polymerization 22 of 1,3-butadiene using a bifunctional initiator. The microstructure, molecular weight, and molecular weight distribution of HTPB were affected by the type of initiator, polarity of the solvent, and polymerization temperature. According to the literature, 23 HTPB prepared by free-radical polymerization had a maximum 79% of 1,4 content, a degree of functionality of 2.1−2.3, and a polydispersity index (PDI) near 2.0. The anionic polymerization process produced HTPB with a maximum 90% of 1,4...

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Section: Introductionmentioning

confidence: 99%

Preparation of Hydroxyl-Terminated Polybutadiene with High Cis-1,4 Content

Zhou

Jie

2014

Ind. Eng. Chem. Res.

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“…The well dispersity and the positive surface charge can be attributed to the amino groups on the microcapsules due to the hydrolysis of unreacted isocyanate groups in HDI, 38 which is revealed by FTIR characterization. Compared with that of the PU raw material, the absorbance peaks (3342, 1635 and 1565 cm À1 ) of amine or amide 39 in the PU microcapsules (PU cap) were enhanced signicantly (Fig. 4).…”

Section: Resultsmentioning

confidence: 98%

Preparation of elastic polyurethane microcapsules using CaCO₃microparticles as templates for hydrophobic substances loading

et al. 2015

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“…There are many ways to prepare nanocapsules using physicochemical methods. In addition to the above-mentioned common methods, they also include coagulated phase separation and multiple emulsion-solvent evaporation methods [105,106]. (See Table 4).…”

Section: Nanoprecipitationmentioning

confidence: 99%

Further Improvement Based on Traditional Nanocapsule Preparation Methods: A Review

Zhou,

Wang,

Wan

et al. 2023

Nanomaterials

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Nanocapsule preparation technology, as an emerging technology with great development prospects, has uniqueness and superiority in various industries. In this paper, the preparation technology of nanocapsules was systematically divided into three categories: physical methods, chemical methods, and physicochemical methods. The technological innovation of different methods in recent years was reviewed, and the mechanisms of nanocapsules prepared via emulsion polymerization, interface polymerization, layer-by-layer self-assembly technology, nanoprecipitation, supercritical fluid, and nano spray drying was summarized in detail. Different from previous reviews, the renewal iteration of core–shell structural materials was highlighted, and relevant illustrations of their representative and latest research results were reviewed. With the continuous progress of nanocapsule technology, especially the continuous development of new wall materials and catalysts, new preparation technology, and new production equipment, nanocapsule technology will be used more widely in medicine, food, cosmetics, pesticides, petroleum products, and many other fields.

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Synthesis of nonionic polyurethanes with hydroxyl-terminated polybutadiene hydrophobic segments and their application in octadecane nanocapsules

Cited by 9 publications

References 13 publications

Preparation of Hydroxyl-Terminated Polybutadiene with High Cis-1,4 Content

Preparation of Hydroxyl-Terminated Polybutadiene with High Cis-1,4 Content

Preparation of elastic polyurethane microcapsules using CaCO₃microparticles as templates for hydrophobic substances loading

Further Improvement Based on Traditional Nanocapsule Preparation Methods: A Review

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Synthesis of nonionic polyurethanes with hydroxyl-terminated polybutadiene hydrophobic segments and their application in octadecane nanocapsules

Cited by 9 publications

References 13 publications

Preparation of Hydroxyl-Terminated Polybutadiene with High Cis-1,4 Content

Preparation of Hydroxyl-Terminated Polybutadiene with High Cis-1,4 Content

Preparation of elastic polyurethane microcapsules using CaCO3microparticles as templates for hydrophobic substances loading

Further Improvement Based on Traditional Nanocapsule Preparation Methods: A Review

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Preparation of elastic polyurethane microcapsules using CaCO₃microparticles as templates for hydrophobic substances loading