Effects of hetero‐armed star‐shaped PCL‐PLA polymers with POSS core on thermal, mechanical, and morphological properties of PLA

Doğancı, Merve Dandan; Caner, Derya; Doğancı, Erdinç; Özkoç, Güralp

doi:10.1002/app.50712

Cited by 18 publications

(17 citation statements)

References 55 publications

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“…However, with the addition of LCHBPs, the number of large particles increased, the average particle size of CA increased, and the distribution range of particle size became wider. The addition of 3 phr LCHBPs increased the average particle size of CA to F I G U R E 3 Micro morphologies of the PLA/CA blends fracture surface 6.01 μm and large-sized particles were appeared, which indicated that excessive LCHBPs inhibited the dispersion of CA in PLA. This may be due to the excessive selfentanglement caused by a large number of LCHBPs, which reduced the effective part of its compatibilization effect on the PLA/CA blends.…”

Section: Morphology Characterizationmentioning

confidence: 98%

“…Because of its extensive sources, rigidity and biodegradable nature, PLA has attracted expanded interest and therefore can be used to replace traditional plastics such as polyethylene, polypropylene, and polyethylene terephthalate 5 . However, the inherent brittleness, lack of flexibility and low crystallizability of PLA has restricted its application 6,7 . As a result, the toughening modification of PLA is necessary.…”

Section: Introductionmentioning

confidence: 99%

“…5 However, the inherent brittleness, lack of flexibility and low crystallizability of PLA has restricted its application. 6,7 As a result, the toughening modification of PLA is necessary.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of compatibilized and toughened polylactic acid/cellulose acetate films by long‐chain hyperbranched polymers

Huang

Jin

Wang

et al. 2021

J of Applied Polymer Sci

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A type of long‐chain hyperbranched polymers (LCHBPs) was prepared by grafting hydroxyl‐terminated flexible long chain onto hyperbranched polymers (HBPs). The structure of LCHBPs was confirmed by Fourier transform infrared (FT‐IR) and nuclear magnetic resonance (1H‐NMR) analysis. It was then used as the modifier for toughening and compatibilizing the polylactic acid (PLA)/cellulose acetate (CA) blends. Upon the addition of LCHBPs, the compatibility between PLA and CA was improved, the dispersion of CA particles in PLA matrix was more uniform, and the brittle‐ductile tear transition of the PLA/CA blends was occurred. The crystallization of PLA was promoted by the addition of LCHBPs. By adding LCHBPs, glass transition temperature and cold crystallization temperature were reduced, the crystallizability was enhanced, and the crystallization temperature range was expanded. The thermal decomposition temperature of the PLA/CA was found increased with the addition of LCHBPs. When the content of LCHBPs was 1 phr, the elongation at break and the tear strength of the PLA/CA blends were increased by 484% and 38.24%, respectively. Meanwhile, the thermal stability and hydrophilic properties of the blend films were improved by adding LCHBPs.

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Section: Morphology Characterizationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of compatibilized and toughened polylactic acid/cellulose acetate films by long‐chain hyperbranched polymers

Huang

Jin

Wang

et al. 2021

J of Applied Polymer Sci

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“…As a special family of organic–inorganic hybrid material, , polyhedral oligomeric silsesquioxane (POSS) (RSiO 1.5 ) n has a cage-shaped core, a rigid, three-dimensional structure, and a switchable branch (such as alkyl, aryl, vinyl, acrylate, epoxide, and so on) at each of the Si sites. − A benefit to the organic–inorganic structure, POSS shows a huge potential for polymer performance modification according to the high solubility in most organic solutions. − The POSS-grafting polymers can be prepared by free radical polymerization, ,, and the method has been used to acquire POSS–PMMA using R-POSS with CC bond branches during thermal polymerization with methyl methacrylate (MMA). − The POSS-containing material with star-shaped or network structure in the polymer matrix can dramatically optimize the properties (Scheme ). ,,− Considering our previous report, which shows that photosensitizer PQ can react with the CC bond of MMA more effectively, the Ma-POSS with eight methacryl (Ma) branches was selected to enhance the holographic performance of the PQ/PMMA photopolymer.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Photopolymer for Holographic Data Storage Containing Methacryl Polyhedral Oligomeric Silsesquioxane

Jin

et al. 2022

ACS Appl. Mater. Interfaces

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Herein, via introducing eight methacryl polyhedral oligomeric silsesquioxane (Ma-POSS), we dramatically enhance the holographic performance of phenanthraquinone-doped poly(methyl methacrylate) (PQ/PMMA) photopolymer with excellent characteristics of high sensitivity, high diffraction efficiency, and neglectable volume shrinkage for holographic data storage, the photosensitivity, diffraction efficiency, and volume shrinkage reaching 1.47 cm/J, ∼75%, and ∼0.09%, respectively. Ma-POSS here dramatically enhances the photosensitivity ∼5.5 times, diffraction efficiency more than 50%, and suppressed the volume shrinkage over 4 times. Further analysis reveals that Ma-POSS obviously increased the molecular weight by grafting PMMA to be a star-shaped macromolecule. And the residual CC of POSS–PMMA dramatically increased the photosensitivity. Moreover, the star-shaped POSS–PMMA acting as a plasticizer dramatically enhances the mechanical properties and so reduces the photoinduced volume shrinkage of PQ/PMMA. Finally, by the use of the POSS–PMMA/PQ in a collinear holography system, it appeared to be promising for a fast but low bit error rate in holographic information storage. The current study thence has not only successfully synthesized photopolymer materials with potential for highly sensitive holographic storage applications but also investigated the microphysical mechanism of the impact of Ma-POSS on the holographic properties of PQ/PMMA photopolymer and clarified the thermal- and photoreaction processes of the POSS–PMMA/PQ photopolymer.

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“…Polyhedral oligomeric silsesquioxane (POSS), a typical reactive nanoparticle with a cage core of an inorganic Si n O 1.5n nanostructure and an organic group, 15 methyl, 16 ethyl, 17 phenyl, acrylates, anhydride, and epoxides, etc as an organic group around it, 18–20 has been attracting much attention for recent years 21–25 . The inorganic cage‐like core structure of POSS provides similar good heat resistance and excellent thermoxidative stability 26,27 . For different materials and composites systems, POSS can be designed and synthesized different functional organic groups to make it have different properties 17,28–32 .…”

Section: Introductionmentioning

confidence: 99%

Effects of difunctional reactive polyhedral oligomeric silsesquioxane on the properties of EPDM

Ji²,

et al. 2021

J of Applied Polymer Sci

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Bifunctional reactive polyhedral oligomeric silsesquioxane (POSS) of 3, 13‐divinyl octyphenyl silsesquioxane (DV‐DDSQ) and 3, 13‐dihydro octyphenyl silsesquioxane (DH‐DDSQ) were used as additive to modify ethylene‐propylene‐diene rubber (EPDM), and double vinyl groups or active hydrogen groups of bifunctional reactive POSS (brPOSS) underwent a cross‐linking reaction with the active hydrogen groups and double bonds of EPDM, to investigate the effect of brPOSS regulating functional reaction group on the properties of EPDM. Crosslinking density, mechanical properties, thermal stability and ablation performance of brPOSS modified EPDM were investigated, and the pyrolysis behavior and surface structure of modified EPDM was analyzed by X‐ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Furthermore, the ablation performance of brPOSS modified insulation based on EPDM was investigated. The results showed that the tensile strength of EPDM/DV‐DDSQ and EPDM/DH‐DDSQ increased by 35.8% and 55.3% respectively compared with EPDM; the tear strength increased by 6.4% and 5% than that of EPDM. Moreover, the 5% initial thermal decomposition temperature based on thermogravimetric analysis (TGA) and mass (or linear) ablation rate ablative performance of brPOSS modified EPDM were optimized to a certain extent, and the ablative performance of brPOSS modified insulation based on is significantly improved, the mass ablation rate of DV‐DDSQ/insulation and DH‐DDSQ/insulation decreased by 35.4% and 41.6% respectively, and linear ablation rate decreased by 38.2% and 39.4% respectively.

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Effects of hetero‐armed star‐shaped PCL‐PLA polymers with POSS core on thermal, mechanical, and morphological properties of PLA

Cited by 18 publications

References 55 publications

Preparation and characterization of compatibilized and toughened polylactic acid/cellulose acetate films by long‐chain hyperbranched polymers

Preparation and characterization of compatibilized and toughened polylactic acid/cellulose acetate films by long‐chain hyperbranched polymers

Highly Sensitive Photopolymer for Holographic Data Storage Containing Methacryl Polyhedral Oligomeric Silsesquioxane

Effects of difunctional reactive polyhedral oligomeric silsesquioxane on the properties of EPDM

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