Synthesis and thermal properties of novel multiblock biodegradable copolymers derived from polyethylene glycol, ε -caprolactone and p-dioxanone

Mohammadi-Rovshandeh, Jamshid

doi:10.2306/scienceasia1513-1874.2008.34.207

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…It may offer a broader spectrum of properties to meet the demands of various applications 17–21. The desired properties achieved by block copolymerization cannot be obtained by random copolymerization, despite the fact that other parameters kept constant in both cases 22–24…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of benzimidazole‐based low CTE block copolyimides

urRehman

Song

et al. 2013

J of Applied Polymer Sci

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A series of block and random copolyimide films were synthesized from various molar ratios of two diamines, rigid 2-(4aminophenyl)-5-aminobenzimidazole (APBI) and flexible 4,4 0 -oxydianiline (ODA) by polycondensation with dianhydride 3,3 0 ,4,4 0biphenyltetracarboxylic dianhydride. The contents of APBI ranged from 10 to 60 mol % in copolyimides. The copolyimide films obtained by thermal imidization of poly(amic acid) solutions, were characterized by TMA, DMA, TGA, DSC, wide-angle X-ray diffraction, FTIR, tensile testing, water uptake (WU), and dielectric constant measurements. Rigid heterocyclic diamine APBI with interchain hydrogen bonding capability, led to low coefficient of thermal expansion (CTE), high T g , high thermal stability and better mechanical properties. Increasing the APBI mol % caused a gradual decrease in the CTE and increase in T g , thermal stability and tensile strength properties of the copolyimides films. Moreover, significantly enhanced thermal and mechanical properties of the block copolyimides were also found as compared to random copolyimides. The block copolyimide with APBI content of 60 mol %, achieved excellent properties, that is, a low CTE (4.7 ppm/K), a high T g at 377 C, 5% weight loss at 562 C and a tensile strength at 198 MPa. This can be interpreted because of comparatively higher degree of molecular orientation in block copolyimides. These copolyimides also exhibited better dielectric constant and WU. This combination of properties makes them attractive candidates for base film materials in future microelectronics.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of benzimidazole‐based low CTE block copolyimides

urRehman

Song

et al. 2013

J of Applied Polymer Sci

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“…As other aliphatic poly(ester-ether), PPDO has drawbacks of low crystallization rate and low melt strength, which limits its applications and processing. Several approaches, such as copolymerization with other monomers − and blending with other polymers, − have been developed to improve the properties of PPDO. The addition of inorganic nanoparticles is also an attractive way. − …”

Section: Introductionmentioning

confidence: 99%

Preparation of Poly(p-dioxanone)/Sepiolite Nanocomposites with Excellent Strength/Toughness Balance via Surface-Initiated Polymerization

Qiu

Zhang

Niu

et al. 2011

Ind. Eng. Chem. Res.

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Novel nanocomposites based on aliphatic poly(ester-ether) [poly(p-dioxanone), PPDO] and fibrous clay (sepiolite) were successfully prepared by surface-initiated polymerization of p-dioxanone (PDO) in the presence of organo-modified sepiolite (OSEP). The existence of OSEP-grafted PPDO in nanocomposites, generated via surface-initiated polymerization from the hydroxyl group-abundant OSEP surface, greatly contributes to improving the performance of these nanocomposites. The dispersion uniformity of OSEP nanofibers in PPDO matrix was confirmed by scanning electron microscope (SEM) observations. Crystallization rate increased with increasing OSEP loading. Surprisingly, only OSEP nanofibers bundles acted as heterogeneous nucleating agents during the latter stage of PPDO crystallization. The incorporation of OSEP significantly enhanced the modulus and viscosity of nanocomposites, whereas nanocomposites still presented liquid-like behavior as neat PPDO. The exciting aspect of this research is that nanocomposites were reinforced and toughened by the addition of OSEP nanofibers.

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“…4. As reported for many copolymers [38][39][40][41], moieties in a copolymer exhibit decomposition curves as if they are alone. TGA has showed interesting properties of the copolymers indicating continuous weight loss starting from 180 °C to nearly 510 °C with derivatives at 232 °C and 417 °C through two steps (Fig.…”

Section: Synthesis Of Poly(ech-g-mma) Comb-type Graft Copolymers By "mentioning

confidence: 52%

Synthesis and characterization of comb-type graft copolymers by redox polymerization and "click" chemistry method

et al. 2020

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The synthesis of poly(epichlorohydrin-g-methyl methacrylate) [poly(ECH-g-MMA)] comb-type graft copolymers were carried out by use of a "click" chemistry to graft terminally propargyl poly(methyl methacrylate) (PMMA-propargyl) to poly(epichlorohydrin) azido (PECH-N 3). For this purpose, PECH-N 3 was synthesized by using poly(epichlorohydrin) and sodium azide. PMMA-propargyl was obtained by reaction of methyl methacrylate and propargyl alcohol via redox polymerization technique. By using PECH-N 3 and PMMA-propargyl, the comb-type graft copolymers were obtained. Characterization of the modified homopolymers and the comb-type graft copolymers was performed by using FT-IR, 1 H-NMR, SEM, GPC, and elemental analysis techniques. Thermal transitions and degradation features of the comb-type graft copolymers were investigated by using DSC and TGA methods. Spectroscopic and thermal analyses revealed that both group modifications and coupling reactions were successfully achieved.

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Synthesis and thermal properties of novel multiblock biodegradable copolymers derived from polyethylene glycol, ε -caprolactone and p-dioxanone

Cited by 11 publications

References 17 publications

Synthesis and characterization of benzimidazole‐based low CTE block copolyimides

Synthesis and characterization of benzimidazole‐based low CTE block copolyimides

Preparation of Poly(p-dioxanone)/Sepiolite Nanocomposites with Excellent Strength/Toughness Balance via Surface-Initiated Polymerization

Synthesis and characterization of comb-type graft copolymers by redox polymerization and "click" chemistry method

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