Reaction effect on the properties of poly(ethylene terephthalate) and poly(styrene- co -maleic anhydride) blends

Yoon, Kwan Han; Lee, H.W; Park, O.O

doi:10.1016/s0032-3861(99)00692-8

Cited by 16 publications

(11 citation statements)

References 21 publications

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“…The T g of SMA shifts to 135.0°C, compared to that of pure SMA at 140°C. Yoon et al30 studied the reaction effect of PET and SMA blends by DSC measurements and drew the conclusion that the reaction between ester groups and MA occurred during melt mixing at 280°C for 30 min. These results show that it is possible to compatibilize PC/LCP blends with the addition of SMA.…”

Section: Resultsmentioning

confidence: 99%

Mechanical performance of blends of thermotropic liquid crystalline polymer spheres‐dispersed polycarbonate

Xue

Zhang

Zheng

et al. 2003

J of Applied Polymer Sci

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Liquid crystalline polymer (LCP) blends with a thermotropic LCP dispersed in the form of microspheres is studied to show the role of LCP spheres. Polycarbonate (PC), p-hydroxybenzoic acid-poly(ethylene terephthalate) copolyester, and random styrene-maleic anhydride copolymer are used as the matrix, the dispersed phase, and the compatibilizer, respectively. A scanning electron microscopy observation shows the formation of LCP spheres with improved interfacial adhesion in the injection-molded samples via compatibilization. The mechanical tests show increased modulus, elongation at break, and fracture-absorbed energy of blends of LCP spheres-dispersed PC. This shows an optimistic potential for the dispersed LCP phase, in spite of its morphology in the form of fibrils for reinforcing the matrix or in the form of microspheres for toughening the matrix.

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Section: Resultsmentioning

confidence: 99%

Mechanical performance of blends of thermotropic liquid crystalline polymer spheres‐dispersed polycarbonate

Xue

Zhang

Zheng

et al. 2003

J of Applied Polymer Sci

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“…This indicates that the PET/SMA blends have better compatibility than the PET/PS blends, which is consistent with reports by Yoon et al based on experiment. [ 57 ] Moreover, the effective nucleation agents should be solid phase and have good thermal stability at the crystallization temperature. Therefore, the degradation temperatures of block ionomers were measured by TGA ( Figure S8, Supporting Information).…”

Section: Non-isothermal Crystallization Behavior Of Pet and Pet/bi Iomentioning

confidence: 99%

Synthesis and Microphase Separation of PS‐b‐P(MA‐alt‐St) Block Copolymers and Their Ionomers for the Design of Polymer Crystallization Nucleation Agents

Xing

Tang

2014

Macro Chemistry & Physics

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Several well-controlled polystyrene-block -poly(styrene-alt -maleic anhydride) (PS-b -P(St-alt -MA)) functionalized block copolymers (BCs) and their sodium salt ionomers with different block ratios and molecular weights are synthesized through two-step reversible additionfragmentation chain transfer (RAFT) polymerization. The atomic force microscopy (AFM) images and differential scanning calorimetry (DSC) results reveal that the prepared BCs and their ionomers microphase separate into various nanostructures depending on the block ratios. By taking advantage of the formation of amphiphilic nanostructures via the microphase, the block ionomers serve as nucleation agents to improve the crystallization rate of poly(ethylene terephthalate) (PET). The crystallization behavior of PET upon the addition of block ionomers is investigated isothermally and non-isothermally by DSC. The results show that the block ionomers can effectively accelerate the crystallization rate of PET, which strongly depends on the molecular weights and block ratios interaction energy and the chain stretching and mainly depend on the molecular weight fraction of the constituent blocks and segregation strength denoted by χN , where χ is the Flory-Huggins interaction parameter and N is the polymerization index. [2][3][4][5] For BCs in bulk, self-assembled, periodic structures such as body-centered-cubic-packed (bcc) spheres, hexagonal-close-packed (hcp) cylinders, lamellae, and more complex phases have been theoretically predicted and experimentally observed. [5][6][7] An important application of BCs is as a compatibilizer for immiscible homopolymers. This makes the systems compatible by taking advantage of the amphiphilic characteristics to interact with both phases. For instance, functionalized BCs consisting of polar maleic anhydride (MA) units often serve as commercial compatibilizers in most immiscible polymer blends. The MA-grafted poly(styreneb -(ethylene-co -butylene)-b -styrene) block copolymer (SEBS-MA) improves the dispersion of nanomagnesium hydroxide (nano-MH) in isotactic polypropylene (PP)

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“…Composite materials that have no analogs in their economics and technical characteristics are developed on its base. Such materials include blends with polycarbonate [3,4]; olefin polymers and copolymers [5,6]; elastomers, poly(butylene terephthalate), styrene plastics [7,8] and other polymers; materials reinforced by glass-fibers [2,9]; fireproof composites [10] as well as systems containing small quantities of hard nanoparticles [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanodisperse Carbon Fillers and Isocyanate Chain Extender on Structure and Properties of Poly(ethylene terephthalate)

Agabekov

Golubovich

Песецкий

2012

Journal of Nanomaterials

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The effect of diisocyanate chain extender (CE) on the mechanical, rheological, and relaxation properties, as well as on molecular weight and crystallizability, of starting poly(ethylene terephthalate) (PET) and its composites containing carbon nanomaterials (CNM) such as carbon nanotubes (CNTs) and commercial carbon (CC) has been studied. The composites were compounded in molten PET using twin-screw extruder (screw diameter 35 mm; L/D = 40). To improve the distribution of CNM in the polymeric matrix (before introduction into the melt), they were blended with PET powder and subjected to an ultrasonic treatment in methylene chloride. The salient features of the materials structure were estimated based on DSC and relaxation spectrometry (dynamic mechanical analysis) data. It has been found that CNM additives partly suppress the PET-chain extension reactions which take place during interaction between macromolecular end groups and CE. Besides, both CNT and CC favour crystallizability of the modified PET owing to nucleation of the crystallization process. The influence of CNT appears to be more effective than that of CC. Enhancements in true mechanical strength and deformability of PET/CE/CNM composites, as against PET/CE materials, were found to be most clearly exhibited by the CNT-containing composites.

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Reaction effect on the properties of poly(ethylene terephthalate) and poly(styrene- co -maleic anhydride) blends

Cited by 16 publications

References 21 publications

Mechanical performance of blends of thermotropic liquid crystalline polymer spheres‐dispersed polycarbonate

Mechanical performance of blends of thermotropic liquid crystalline polymer spheres‐dispersed polycarbonate

Synthesis and Microphase Separation of PS‐b‐P(MA‐alt‐St) Block Copolymers and Their Ionomers for the Design of Polymer Crystallization Nucleation Agents

Effect of Nanodisperse Carbon Fillers and Isocyanate Chain Extender on Structure and Properties of Poly(ethylene terephthalate)

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