Identification of side chain effect as an important factor influencing the secondary relaxation of polyesters containing cyclohexylene ring

Chi, Dequan; Liu, Fei; Hao, Chuncheng; Chen, Jing; Na, Haining; Zhu, Jin

doi:10.1007/s10853-017-1984-7

Cited by 3 publications

(4 citation statements)

References 34 publications

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“…Previously, our group has successfully prepared SMPUs with nonplanar chain extenders. − Research results showed that the structures containing nonplanar rings provided a good amount of rigidity and could work as a chain extender that goes through a conformational transformation. Through conformational transformation, the nonplanar ring structure was able to absorb a certain amount of energy when subjected to external forces and thus helped to buffer the external forces.…”

Section: Introductionmentioning

confidence: 99%

Highly Cross-Linked and Stable Shape-Memory Polyurethanes Containing a Planar Ring Chain Extender

Luo

Chen

Gnanasekar

et al. 2020

ACS Appl. Polym. Mater.

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Shape-memory biomaterials, especially those stable against degradation, are attractive for applications in the biomedical fields, such as artificial bone scaffold material, artificial blood vessel material, and so on. In this study, shape-memory polyurethanes (SMPUs) were synthesized based on poly(ε-caprolactone) (PCL) diol, dicyclohexylmethylmethane-4,4′-diisocyanate (HMDI), and planar ring chain extenders. Catechol (PCTE), 1,4,9,10-anthracenetetrol (ANTE), and 2,3,6,7,10,11-hexahydroxytriphenylene hydrate (HHTP) with different rigidities were used as the stationary phase to produce the SMPUs. Shape-memory and degradation properties of the SMPUs were characterized. It was found that poly(PCL & PCTE urethane) (PCPU), poly(PCL & ANTE urethane) (PCAU), and poly(PCL & HHTP urethane) (PCHU) showed outstanding shapememory properties with the shape fixity rate of 90.9%, 90.4%, and 94.0% and shape recovery rate of 99.1%, 99.1%, and 98.7%, respectively, following the triple-shape-memory testing procedure. Moreover, during the 6 month hydrolysis process, all SMPUs had 90.6%−94.3% of weight remaining, demonstrating good hydrolysis resistance with highly stable thermomechanical performance. These SMPUs possess excellent shape-memory properties and are highly promising for applications as implant materials in vivo.

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Section: Introductionmentioning

confidence: 99%

Highly Cross-Linked and Stable Shape-Memory Polyurethanes Containing a Planar Ring Chain Extender

Luo

Chen

Gnanasekar

et al. 2020

ACS Appl. Polym. Mater.

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“…This effect turns a polyester from semicrystalline to amorphous. Moreover, it increases the glass transition temperature 19 . In their research, Pan et al also indicate that the side butyl groups and side ethyl groups of BEPD diminish polyester crystallinity and increase glass transition temperature 20 .…”

Section: Introductionmentioning

confidence: 92%

“…Moreover, it increases the glass transition temperature. 19 In their research, Pan et al also indicate that the side butyl groups and side ethyl groups of BEPD diminish polyester crystallinity and increase glass transition temperature. 20 Umesh et al used BEPD as the primary diol for glycidyl carbamate resins since its long side chains can reduce the resin viscosity.…”

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confidence: 95%

Vinyl methyl oxazolidinone as reactive diluent to overcome the solubility limitations of highly polar unsaturated polyesters

Wylezek,

Kalinkin,

Gläser

et al. 2024

J of Applied Polymer Sci

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Vinyl methyl oxazolidinone (VMOX®) is studied as a new reactive diluent (RD) for highly polar unsaturated polyesters (UPs). Molecules with special structure properties are extensively investigated as components for unsaturated polyester resins (UPRs) and thermosets, particularly for high‐temperature applications. Special diols with a cyclic structure like isosorbide and tricyclodecanedimethanol or special diols with side groups like 2‐methyl‐2‐propyl‐1,3‐propanediol and 2‐ethyl‐2‐butyl‐1,3‐propanediol can provide interesting properties. Bio‐based diols such as isosorbide and 1,3‐butanediol improve the sustainability profile. However, UPs based on such special diols have a higher polarity, limiting their solubility in styrene. This demands a RD, which provides adequate solubility and is suitable for high‐temperature applications. Therefore, our study compares the solubility of highly polar UPs based on special diols in styrene and VMOX®. UPs with different formulations, polarities, and Hansen parameters were synthesized and characterized. The solubility sphere of styrene was determined experimentally with the synthesized UPs. The influence of the special diols on the thermoset properties was investigated in dynamic mechanical analysis measurements. In conclusion, VMOX® as a RD enables full utilization of special diols properties due to the wide solubility window. Moreover, a new class of high‐temperature styrene‐free UP resin was developed.

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“…To achieve these properties in high-performance polymers, various flexible ether linkages were incorporates to yield poly(ether ester)s and poly(ether amide)s [18,19]. High-molecular-weight terephthalate copolyesters from flexible cycloaliphatic diols or diacids displayed a coherent structure-property relationship related to the rigid, flexible, and bulky structures [20,21]. The copolyesterification process also enhanced the solubility of resulting polyesters due to a formation of the random, irregular arrangement in polymer chains.…”

Section: Introductionmentioning

confidence: 99%

Aromatic Polyesters Containing Ether and a Kinked Aromatic Amide Structure in the Main Chain: Synthesis and Characterisation

Deokar¹,

Joshi

Tamboli

et al. 2022

Coatings

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A novel bisphenol containing preformed multiple ether and amide linkages, N, N′-Bis (4-hydroxyphenoxyphenylene) isophthalamide (IPCD), was prepared and analysed by spectroscopic methods. New aromatic polyesters were prepared by polycondensation of IPCD with 1, 3-benzene diacidchloride and/or 1, 4-benzene diacidchloride. These obtained polyesters were structurally analysed by infra-red spectroscopy, measurements of inherent viscosity, wide-angle X-ray diffraction patterns, and thermal techniques such as differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and solubility tests in organic solvents. The synthesised polyesters had high molecular weights, as indicated by their inherent viscosities from 0.67 to 0.78 dL/g in N-methyl-2-pyrrolidone. The incorporation of ether and kinked aromatic amide moieties in the main polyester chains greatly affected the properties of these aromatic polyesters. The prepared polyesters readily dissolved in amide-type polar aprotic solvents and pyridine, indicating their solution processability. The DSC curves above the polyesters showed glass transition temperatures of 194 to 269 °C. TGA indicated that these newly obtained polyesters were stable up to 301 °C and retained a 39 to 48% weight at 900 °C. W-XRD analyses showed that the newly synthesised polyesters were amorphous, which is reflected in their solubility behaviour.

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Identification of side chain effect as an important factor influencing the secondary relaxation of polyesters containing cyclohexylene ring

Cited by 3 publications

References 34 publications

Highly Cross-Linked and Stable Shape-Memory Polyurethanes Containing a Planar Ring Chain Extender

Highly Cross-Linked and Stable Shape-Memory Polyurethanes Containing a Planar Ring Chain Extender

Vinyl methyl oxazolidinone as reactive diluent to overcome the solubility limitations of highly polar unsaturated polyesters

Aromatic Polyesters Containing Ether and a Kinked Aromatic Amide Structure in the Main Chain: Synthesis and Characterisation

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