Synthesis and Properties of Shape Memory Poly(γ-Benzyl-l-Glutamate)-b-Poly(Propylene Glycol)-b-Poly(γ-Benzyl-l-Glutamate)

Gu, Lin; Jiang, Yuanzhang; Hu, Jinlian

doi:10.3390/app7121258

Cited by 14 publications

(10 citation statements)

References 30 publications

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“…Figure 2 shows the FTIR spectra of P3 and P7 . The amide I (C=O stretch) region that is present at 1600–1700 cm −1 could be employed to determine the structure (e.g., β -sheet, α -helix) of polypeptides [21,26]. The strong band of β -sheet occurs at 1636–1640 cm −1 (parallel) or 1622–1632 cm −1 (antiparallel).…”

Section: Resultsmentioning

confidence: 99%

“…γ -Benzyl- l -glutamate- N -carboxyanhydride (BLG-NCA) was prepared from BLG and triphosgene in THF according to the literatures [21,22]. Poly( γ -benzyl- l -glutamate)- b -poly(propylene glycol)- b -poly( γ -benzyl- l -glutamate) (PBLG- b -PPG- b -PBLG) triblock was synthesized by amine-initiated BLG-NCA polymerization, as shown in Scheme 1.…”

Section: Methodsmentioning

confidence: 99%

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Facile Preparation of Highly Stretchable and Recovery Peptide-Polyurethane/Ureas

Jiang

2018

Polymers

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Abstract:In this work, a new class of highly stretchable peptide-polyurethane/ureas (PUUs) were synthesized containing short β-sheet forming peptide blocks of poly(γ-benzyl-L-glutamate)-bpoly(propylene glycol)-b-poly(γ-benzyl-L-glutamate) (PBLG-b-PPG-b-PBLG), isophorone diisocyanate as the hard segment, and polytetramethylene ether glycol as the soft phase. PBLG-b-PPG-b-PBLG with short peptide segment length (<10 residues) was synthesized by amine-initiated ring opening polymerization of γ-benzyl-L-glutamate-N-carboxyanhydrides (BLG-NCA), which shows mixed α-helix and β-sheet conformation, where the percent of β-sheet structure was above 48%. Morphological studies indicate that the obtained PUUs show β-sheet crystal and nanofibrous structure. Mechanical tests reveal the PUUs display medium tensile strength (0.25-4.6 MPa), high stretchability (>1600%), human-tissue-compatible Young's modulus (226-513 KPa). Furthermore, the shape recovery ratio could reach above 85% during successive cycles at high strain (500%). In this study, we report a facile synthetic method to obtain highly stretchable and recovery peptide-polyurethane/urea materials, which will have various potential applications such as wearable and implantable electronics, and biomedical devices.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Facile Preparation of Highly Stretchable and Recovery Peptide-Polyurethane/Ureas

Jiang

2018

Polymers

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“…Nowadays, the R & D works on shape memory polyurethanes are focused on potential medical applications. The related SM polyurethanes, having a T trans matched with the body temperature, are often synthesized using bio-based compounds [53,54,55,56].…”

Section: One-way Dual-shape Memory Epoxy (Ep) Formulationsmentioning

confidence: 99%

Review of Progress in Shape Memory Epoxies and Their Composites

2017

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Shape memory polymer (SMP) is capable of memorizing one or more temporary shapes and recovering successively to the permanent shape upon various external stimuli. Beside of the above mentioned one-way variants, also two-way shape memory polymers (SMPs) and shape memory (SM) systems exist which feature a reversible shape change on the basis of "on-off switching" of the external stimulus. The preparation, properties and modelling of shape memory epoxy resins (SMEP), SMEP foams and composites have been surveyed in this exhaustive review article. The underlying mechanisms and characteristics of SM were introduced. Emphasis was put to show new strategies on how to tailor the network architecture and morphology of EPs to improve their SM performance. To produce SMEPs novel preparation techniques, such as electrospinning, ink printing, solid-state foaming, were tried. The potential of SMEPs and related systems as multifunctional materials has been underlined. Added functionality may include, among others, self-healing, sensing, actuation, porosity control, recycling. Recent developments in the modelling of SMEPs were also highlighted. Based on the recent developments some open topics were deduced which are merit of investigations in future works.

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“…The next important milestone in the development of SMPs is the application of heat shrinkable tubes and heat shrinkable films in the 1960s [11][12][13][14]. Nowadays, after decades of development, SMPs have been successfully used in many fields, such as aerospace [15][16][17][18], biomedical [19][20][21][22][23], and smart appliances [24]. Compared with shape memory alloys (SMAs) and shape memory ceramics (SMCs), SMPs have the advantages of lower density, higher strain (up to 800% [25]), excellent processability, good chemical stability, biocompatibility [20,22], and an adjustable biodegradation rate [26].…”

Section: Introductionmentioning

confidence: 99%

Effect of PEW and CS on the Thermal, Mechanical, and Shape Memory Properties of UHMWPE

et al. 2020

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Modified ultra-high-molecular-weight polyethylene (UHMWPE) with calcium stearate (CS) and polyethylene wax (PEW) is a feasible method to improve the fluidity of materials because of the tense entanglement network formed by the extremely long molecular chains of UHMWPE, and a modified UHMWPE sheet was fabricated by compression molding technology. A Fourier-transform infrared spectroscopy test found that a new chemical bond was generated at 1097 cm−1 in the materials. Besides, further tests on the thermal, thermomechanical, mechanical, and shape memory properties of the samples were also conducted, which indicates that all properties are affected by the dimension and distribution of crystal regions. Moreover, the experimental results indicate that the addition of PEW and CS can effectively improve the mechanical properties. Additionally, the best comprehensive performance of the samples was obtained at the PEW content of 5 wt % and the CS content of 1 wt %. In addition, the effect of temperature on the shape memory properties of the samples was investigated, and the results indicate that the shape fixity ratio (Rf) and the shape recovery ratio (Rr) can reach 100% at 115 °C and 79% at 100 °C, respectively, which can contribute to the development of UHMWPE-based shape memory polymers.

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Synthesis and Properties of Shape Memory Poly(γ-Benzyl-l-Glutamate)-b-Poly(Propylene Glycol)-b-Poly(γ-Benzyl-l-Glutamate)

Cited by 14 publications

References 30 publications

Facile Preparation of Highly Stretchable and Recovery Peptide-Polyurethane/Ureas

Facile Preparation of Highly Stretchable and Recovery Peptide-Polyurethane/Ureas

Review of Progress in Shape Memory Epoxies and Their Composites

Effect of PEW and CS on the Thermal, Mechanical, and Shape Memory Properties of UHMWPE

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