Polycarbonate modified with crystallisable bis-ester tetra-amide units in a reaction extrusion process

Zuiderduin, W.C.J.; Gaymans, R.J.

doi:10.1016/j.reactfunctpolym.2007.10.023

Cited by 9 publications

(14 citation statements)

References 18 publications

(42 reference statements)

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“…Phase separation can occur through liquid–liquid demixing or crystallization. The polyurethanes phase separates through liquid–liquid demixing, often followed by partial crystallization of the rigid segments . Fast crystallizing segments, such as polyesters or polyamides, are usually phase separated through crystallization…”

Section: Introductionmentioning

confidence: 99%

Highly Solvent‐Resistant Polystyrene Based on Uniform Tetraamide Units

et al. 2014

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In this article, segmented multiblock copolymers are synthesized using monodispersed tetraamide (T6T6T or T6A6T dimethyl) as hard segments and hydroxy-terminated polystyrene (PSt) with a low molecular weight of 2500 g/mol as a soft segment. The soft segment length was varied from 2500 to 11,000 g/mol using dimethylterephthalate as a chain extender. The copolymers are characterized by inherent viscosity measurements, Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), water absorption, and solvent resistivity. The inherent viscosity increases with increasing soft segment length. Depending on the amide concentration in the copolymers, the hard segment melting temperature ranged between 248 and 287°C. From the FTIR, DSC, and wide angle X-ray diffraction results, it is concluded that the hard segments in the copolymer are crystallized completely. All the polymers showed single-stage decomposition temperature centered around 430°C. The solvent resistivity of these materials is extremely very high even at a low concentration of amide content (7%). C 2014 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21485; View this article online at wileyonlinelibrary.com.

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Section: Introductionmentioning

confidence: 99%

Highly Solvent‐Resistant Polystyrene Based on Uniform Tetraamide Units

et al. 2014

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“…Polyurethane-urea-amide based on PEO, HMDI and hard segment (6A6 or 6T6) formed using a solution/melt polymerization method and characterized by NMR, FT-IR, DSC and TGA techniques. 1 H NMR spectrum confirms the formation of PUUA copolymer.…”

Section: Discussionmentioning

confidence: 64%

“…To this mixture, DBTDL added and the stirring continued for another 1 h. The solvent removed under vacuum and the polymer obtained is colorless rubbery material. 1 H NMR (d, ppm): 4.4 (t, CH 2 connected to the oxygen present in the urethane), 3.8 (m, CH 2 connected to the ether), 3.6(t, CH 2 connected to amide), 3.2 (b, -CH 2 -connected to urea group), 3.1 (b, -CH 2connected to urethane group) 1.5-2.5 (m, aliphatic proton).…”

Section: Preparation Of Poly(urethane-urea-amide) Based On 6a6mentioning

confidence: 99%

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Biodegradable poly(urethane-urea-amide): Synthesis, characterization and mechanical studies

Deepa

Lakshmi

Kayalvizhi

et al. 2020

Journal of Thermoplastic Composite Materials

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Biodegradable polyurethane with excellent mechanical property finds a lot of applications in the biomedical field. In this study, multi block copolymer poly(urethane-urea-amide) (PUUA) is prepared using polyethylene oxide, 1,6-hexamethylene diisocyanate and diamide (N1, N4-bis(6-aminohexyl)benzene-1,4-dicarboxamide (6T6) or N 1, N 6-bis(6-aminohexyl)hexanediamide (6A6)) by a method of solution/melt polymerization techniques. The polymer formation is confirmed by the 1H NMR spectroscopic method. Other techniques such as viscosity measurements, FT-IR, DSC, TGA, and biodegradability are used to characterize the synthesized copolymers. The hard segment crystallinity is an analyzed by FT-IR spectroscopy, it revealed that the 6T6 based polymer showed 70% of crystallinity. The synthesized copolymer shows three transitions in the DSC curve. The melting enthalpy of the hard segment depends on the amide unit employed in the polymerization process. These materials are fast crystallizing due to low under cooling value. This material has a very high thermal stability and stable up to 400°C. Tensile test confirms the strain induced crystallization of hard segment occurred in the PUUA. The biodegradability of the polymer depends on the pH and chain extenders. This type of materials can be a good candidate for tissue engineering application.

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“…On the other hand, the crystallization problem of the HS can overcome by using a regular and monodispersed HS in the copolymer there by the crystallization will be fast and complete [9]. With increasing monodipersity of the HS, the crystallization rate increases [10,11] and the HS segments will be crystallized out in nano ribbons with a high aspect ratio [12,13]. The function of the crystalline nano ribbons is to act as a physical crosslink and also as reinforcing fillers.…”

Section: Introductionmentioning

confidence: 99%

Effect of nano ribbons formed by the amide segment on the solvent resistivity of segmented block copolymers based on polystyrene

Vakees

Suresh

Kayalvizhi

et al. 2017

Polymer Engineering & Sci

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A segmented block copolymer is synthesized using dihydroxy terminated polystyrene (PSt) (MW = 2,500 g/mol) and crystallizable amide segments. PSt length in the copolymer is varied from 2,500 to 10,000 g/mol using dimethylterephthalate (T). Amide segment is synthesized in situ using diamine‐diamide 6X6 (X = A or T) (synthesized by dimethylterepthalate [T], adipic acid [A], and hexamethylenediamine [6]) and T. This work is to modify the high Tg amorphous PSt to a semicrystalline copolymers (‐(PSt‐T)y‐6X6‐T‐)‐n). These copolymers have a very high inherent viscosity and depending on the amide concentration, the melting temperature of the polymers was ranged between 129°C and 248°C. The crystallinity of the amide segments is up to 75%. The AFM analysis showed the presence of crystalline ribbons with a high aspect ratio. All the polymers show single stage decomposition temperature centered around 420°C. The solvent resistivity of these materials is very high even at a low concentration of (5 wt%) amide content. POLYM. ENG. SCI., 58:361–368, 2018. © 2017 Society of Plastics Engineers

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Polycarbonate modified with crystallisable bis-ester tetra-amide units in a reaction extrusion process

Cited by 9 publications

References 18 publications

Highly Solvent‐Resistant Polystyrene Based on Uniform Tetraamide Units

Highly Solvent‐Resistant Polystyrene Based on Uniform Tetraamide Units

Biodegradable poly(urethane-urea-amide): Synthesis, characterization and mechanical studies

Effect of nano ribbons formed by the amide segment on the solvent resistivity of segmented block copolymers based on polystyrene

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