Preparation and characterization of novel thermoplastic elastomers by step/chain transformation polymerization

Wang, Tzong-Liu; Huang, Fang-Jung

doi:10.1016/s0032-3861(99)00731-4

Cited by 20 publications

(15 citation statements)

References 14 publications

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“…2). Furthermore, two weak absorption peaks corresponding to the ester carbonyl group of TPEU can be observed at 1731 and 1705 cm Ϫ1 , which can be assigned to free and hydrogen-bonded urethane carbonyl groups [31]. The above results demonstrated that the TPEU-co-MCPA6 copolymers did produce in the polymerization process of CL.…”

Section: Ftir Analysismentioning

confidence: 66%

Preparation and characterization of thermoplastic polyurethane elastomer and polyamide 6 blends by in situ anionic ring‐opening polymerization of ϵ‐caprolactam

Hou

Liu

Yang

2006

Polymer Engineering & Sci

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The blends of thermoplastic polyether-based urethane elastomer (TPEU) and monomer casting polyamide 6 (MCPA6) were prepared using -caprolactam (CL) as a reactive solvent, and CL sodium as a catalyst at various TPEU contents (2.5-15 phr by weight). In situ anionic ring-opening polymerization and in situ compatibilization of TPEU/MCPA6 blends were realized in one step. The dissociated TPEU chains acted as macroactivator to initiate MCPA6 chain growth from the TPEU chains. The formed block copolymers (TPEU-co-MCPA6), which have been confirmed by Fourier transform infrared spectroscopy and 1 H-NMR analysis, improved the compatibility between TPEU and MCPA6. In addition, both differential scanning calorimetry and dynamic mechanical analysis studies revealed that the crystallinity temperature, melting temperature, the degree of crystallization, and the glass-transition temperature of MCPA6 component remarkably shifted to a low temperature with increasing TPEU content. Mechanical properties demonstrated that the impact strength and the elongation-atbreak of the blends significantly increased with the content of TPEU, whereas a progressive decrease occurred in tensile strength, flexural strength, and flexural modulus. WAXD spectra showed that only ␣-form crystal of PA6 component existed in the TPEU/MCPA6 blends. Furthermore, scanning electron microscopes (SEM) of the cryo-fractured surfaces confirmed a substantially improved compatibility, and reflected a seemly single-phase morphology. POLYM. ENG. SCI., 46: 1196 -1203, 2006.

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Section: Ftir Analysismentioning

confidence: 66%

Preparation and characterization of thermoplastic polyurethane elastomer and polyamide 6 blends by in situ anionic ring‐opening polymerization of ϵ‐caprolactam

Hou

Liu

Yang

2006

Polymer Engineering & Sci

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“…DSC curves of the pure TPU and the in situ TPU/PANI with the ANI contents from 20 to 40 wt % are shown in Figure 7(a) and (b–d), respectively. In Figure 7(a), two DSC characteristic transitions at around 100 and 160°C are observed corresponding to the glass transition of the hard segments and the melting of TPU molecular chains, respectively 29–32. In comparison with the pure TPU, Figure 7(b–d) reveals that the DSC characteristic transitions at both lower (∼ 100°C) and higher (140–200°C) temperature regions change remarkably.…”

Section: Resultsmentioning

confidence: 97%

“…In Figure 7(a), two DSC characteristic transitions at around 100 and 160 C are observed corresponding to the glass transition of the hard segments and the melting of TPU molecular chains, respectively. [29][30][31][32] In comparison with the pure TPU, Figure 7 at around 60 C and the latter at about 100 C are attributed to the T g transitions of the polyether molecular chains (soft segments) of TPU and the hard segments of both TPU and PANI, because the motion of the soft segments is evidently influenced by the interactions and hydrogen bonds between TPU and the in situ PANI whose molecular chains are relatively conjugate and rigid. In the case of the higher temperature range, two endothermic peaks are seen in all specimens.…”

Section: Dsc Analysismentioning

confidence: 99%

A novel soluble PANI/TPU composite doped with inorganic and organic compound acid

Wang¹,

Yang²,

Tong³

et al. 2009

J of Applied Polymer Sci

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A series of novel soluble and thermoplastic polyurethane/polyaniline (TPU/PANI) composites doped with a compound acid, which was composed of an organic acid (p-toluene sulfonic acid) and an inorganic acid (phosphoric acid), were successfully prepared by in situ polymerization. The effect of aniline (ANI) content, ratio of organic acid/inorganic acid, and different preparation methods on the conductivity of the TPU/PANI composites were investigated by using conductivity measurement. Lithium bisoxalato borate (LiBOB) was added to the prepared in situ TPU/PANI to coordinate with the ether oxygen groups originating from the soft molecular chains of TPU, and thus the conductivity of the composites was further enhanced. The molecular structure, thermal properties, and morphology of the TPU/PANI composites were studied by UV-visible spectroscopy, differential scanning calorimetry, and scanning electron microscopy, respectively. The results show that the in situ TPU/PANI composites doped with the compound acid can be easily dissolved in normal solvents such as dimethylformamide (DMF) and 1,4-dioxane. The conductivity of the TPU/ PANI composites increases with the increase of the ANI content, in the ANI content range of 0-20 wt %; however, the conductivity of the composites reduces with further increment of ANI content. The conductivity of the TPU/ PANI composites prepared by in situ polymerization is about two orders of magnitude higher than that prepared by solution blending method. LiBOB can endow the in situ TPU/PANI composites with an ionic conductivity. The dependence of the conductivity on temperature is in good accordance with the Arrhenius equation in the temperature range of 20-80 C.

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“…The IR spectrum of PMMA-PAN block copolymer has the characteristic peak of PAN at 2246.7 cm Ϫ1 (CN) and of PMMA at 1732.5 cm Ϫ1 (CAO) and 1154.3 cm Ϫ1 (COOOC), respectively. The 1 H-NMR a spectrum of PMMA-b-PAN shows a peak at around 2.13 ppm, which can be attributed to NCOCHO 19 , and the peak centered at 3.47 ppm is due to the OCOOCH 3 group of PMMA.…”

Section: Block Copolymerizationmentioning

confidence: 97%

Photopolymerization of methyl methacrylate by 2,2′‐dithiodiethanol: Effect of reaction conditions

Baruah

Kakati

2006

J of Applied Polymer Sci

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ABSTRACT:The photopolymerization of methyl methacrylate (MMA) through the use of a novel disulphide, 2,2Ј-dithiodiethanol (DDE), was studied. This photoinitiator is of special interest because of its possible use in the synthesis of polyurethane macrophotoinitiator. The photopolymerization was carried out in the Heber multilamp photochemical reactor (COMPACT-LP-MP88) at 254 nm. The effects of reaction conditions on the polymerization of MMA were studied. It was observed that the percentage conversion and molecular weight increased with the increases of monomer concentration and reaction time. However, for the initiator to monomer molar ratio, there was a critical molar ratio for maximum conversion. The results suggested the living radical nature of the photoinitiator, which was further investigated by the preparation of block copolymer with acrylonitrile.

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Preparation and characterization of novel thermoplastic elastomers by step/chain transformation polymerization

Cited by 20 publications

References 14 publications

Preparation and characterization of thermoplastic polyurethane elastomer and polyamide 6 blends by in situ anionic ring‐opening polymerization of ϵ‐caprolactam

Preparation and characterization of thermoplastic polyurethane elastomer and polyamide 6 blends by in situ anionic ring‐opening polymerization of ϵ‐caprolactam

A novel soluble PANI/TPU composite doped with inorganic and organic compound acid

Photopolymerization of methyl methacrylate by 2,2′‐dithiodiethanol: Effect of reaction conditions

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