Synthesis of highly branched poly(δ-valerolactone)s: a comparative study between comb and linear analogues

Ren, Yingying; Wei, Zhiyong; Wu, Tong; Bian, Yufei; Leng, Xuefei; Zhou, Cheng; Li, Yang

doi:10.1039/c6ra09289f

Cited by 23 publications

(19 citation statements)

References 48 publications

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“…The DSC thermograms of pure PDVL and PDVL/TiO2 nanocomposites recorded in the cooling mode are shown in Figure 5, and the temperatures and the heats of crystallization that were deducted are gathered in Table 2. The DSC thermogram of pure PDVL exhibits a crystallization temperature at 27 °C, which is slightly lower than that in the literature (29.7-30.4 °C) [44]. However, no significant change in the Tc value of PDVL is observed when the amount of TiO2 varied from 1 to 5 wt % is incorporated in the polymer matrix.…”

Section: Thermal Behavior Of the Pdvl/tio 2 Nanocompositecontrasting

confidence: 57%

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Thermal Properties and Non-Isothermal Crystallization Kinetics of Poly (δ-Valerolactone) and Poly (δ-Valerolactone)/Titanium Dioxide Nanocomposites

et al. 2018

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New poly (δ-valerolactone)/titanium dioxide (PDVL/TiO2) nanocomposites with different TiO2 nanoparticle loadings were prepared by the solvent-casting method and characterized by Fourier transform infra-red, differential scanning calorimetry, X-ray diffraction and scanning electron microscopy, and thermogravimetry analyses. The results obtained reveal good dispersion of TiO2 nanoparticles in the polymer matrix and non-formation of new crystalline structures indicating the stability of the crystallinity of TiO2 in the composite. A significant increase in the degree of crystallinity was observed with increasing TiO2 content. The non-isothermal crystallization kinetics of the PDVL/TiO2 system indicate that the crystallization process involves the simultaneous occurrence of two- and three-dimensional spherulitic growths. The thermal degradation analysis of this nanocomposite reveals a significant improvement in the thermal stability with increasing TiO2 loading.

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Section: Thermal Behavior Of the Pdvl/tio 2 Nanocompositecontrasting

confidence: 57%

“…• were assigned to diffraction of the (110) and (200) lattice planes, respectively [44], indicating that the PDVL probably crystallized in the ordinary crystal geometric structure. The crystallographic analysis conducted by Furuhashi indicated that PDVL crystallized with an orthorhombic unit cell structure [45].…”

Section: Xrd Analysismentioning

confidence: 99%

Thermal Properties and Non-Isothermal Crystallization Kinetics of Poly (δ-Valerolactone) and Poly (δ-Valerolactone)/Titanium Dioxide Nanocomposites

et al. 2018

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“…Poly(δ-valerolactone) (PVL) has identical features with linear aliphatic polyester poly(ε-caprolactone) (PCL), such as hydrophobic nature, semi-crystalline structure, low melting point and low cytotoxicity. However, there are limited studies on synthesis and application of PVL in biomedical area in contrast to PCL [4,6]. There exist several attempts for ring opening polymerization (ROP) of δ-valerolactone (δ-VL) including organometallic catalysts or biocatalyts.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, synthesis of PVL with maximum molecular weight and suitable properties was purposed. Thus, polymerizations were carried out at varied temperatures (30, 40, 60, and 80℃) and periods (6,24,48,72, and 120 hours) in order to determine optimum conditions.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of Commercial and Home-Made Lipases for Synthesis of Poly(δ-valerolactone) Homopolymers

Ulker¹,

Gok²,

Güvenilir³

2019

Journal of Renewable Materials

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Novozyme 435, which is the commercially available immobilized form of Candida antarctica lipase B, has been successfully conducted ring opening polymerization of lactones in organic solvents. In this paper, it was aimed to introduce an alternative biocatalyst for Novozyme 435. Candida antarctica lipase B immobilized onto rice husk ashes via physical adsorption (with a specific activity of 4.4 U/mg) was prepared in previous studies and used as a biocatalyst for poly(δ-valerolactone) synthesis in the present work. Polymerization reactions were proceeded at various reaction temperatures and periods via both two immobilized enzyme preparations. The resulting products were characterized spectroscopically and thermally. The highest molecular weight (Mn = 9010 g/mol) was obtained via Novozyme 435 catalysis at 40℃ and 24 hours. The performance of home-made lipase, which resulted in a molecular weight of 8040 g/mol, was close to commercial one.

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“…The NMR spectra of PVL is shown in Figure . Each characteristic peak of the proton is detected and allocated, conform to the structure of PVL described in previous reports . The methylene signal of PVL is observed around 4.17 ppm while the other chemical peaks of PVL were observed around 2.44, and 1.78 ppm respectively confirming the formation of PVL.…”

Section: Resultsmentioning

confidence: 99%

Switching from linear to cyclic δ‐Polyvalerolactone synthesized via zeolitic imidazolate framework as a catalyst: A promising approach

Naz

Mousavi

Luo

et al. 2019

Applied Organom Chemis

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A series of spray dried zeolitic imidazolate frameworks (ZIFs = ZIF‐8, ZIF‐67, and Zn/Co‐ZIF) are used as a catalyst for the bulk ring‐opening polymerization of δ‐valerolactone without any co‐catalyst to generate polyvalerolactone. Interestingly, using the same catalyst under the same reaction conditions could manipulate the structure of the product polymer, and thus its physical properties. Thus, using a dried substrate leads to the formation of the cyclic polymer while a linear polymer was formed on using the commercially available substrate. An activated monomer mechanism has been suggested where the propagating zinc alkoxide undergoes an intramolecular transesterification to release cyclic or linear polyvalerolactone. The ROP of δ‐VL without drying shows that the polymeric zwitterions have little tendency to cyclize in the presence of moisture. At 140 °C, ZIF‐8 shows a superior catalytic activity resulting in the production of cyclic polyvalerolactone having a high molecular weight as compared to ZIF‐67 or Zn/Co‐ZIF due to the presence of highly active sites. The catalyst could be recycled and reused without any significant loss of catalytic activity.

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Synthesis of highly branched poly(δ-valerolactone)s: a comparative study between comb and linear analogues

Abstract: A structure–property relationship was constructed based on the facile synthesis of linear-comb and star-comb poly(δ-valerolactone)s.

Cited by 23 publications

References 48 publications

Thermal Properties and Non-Isothermal Crystallization Kinetics of Poly (δ-Valerolactone) and Poly (δ-Valerolactone)/Titanium Dioxide Nanocomposites

Thermal Properties and Non-Isothermal Crystallization Kinetics of Poly (δ-Valerolactone) and Poly (δ-Valerolactone)/Titanium Dioxide Nanocomposites

Performance Comparison of Commercial and Home-Made Lipases for Synthesis of Poly(δ-valerolactone) Homopolymers

Switching from linear to cyclic δ‐Polyvalerolactone synthesized via zeolitic imidazolate framework as a catalyst: A promising approach

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