Papers by Keyword: PTT

Abstract: Isothermal crystallization behavior of PET/PTT-CNTs composites was investigated by DSC. The Avrami equation was employed to describe the isothermal crystallization process. The change of the half-time of crystallization t_1/2 suggested that the addition of CNTs in the composites can accelerate the overall crystallization process.

Abstract: The CNTs have been incorporated in PET/PTT matrix and PET/PTT-CNTs composites have been prepared. The CNTs can act an effective nucleating agent in the PET/PTT matrix and the percolation threshold in PET/PTT-CNTs composites is about 6 wt%. SEM graphs indicated that the CNTs are well dispersed in the PET/PTT matrix.

Abstract: The blends of poly(trimethylene terephthalate) (PTT) with ethylene-propylene-diene copolymer grafted with maleic anhydride (EPDM-g-MA) and organoclay(OMMT) were prepared by melt blending.The composites were characterized by dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). The results suggest that the PTT is immiscible with EPDM-g-MA when OMMT was added to the blends. Strorage modulus of the PTT/EPDM-g-MA/OMMT are higher than those of pure PTT. The melting point of pure PTT and blends was almost constant. The crystallinity of the blends with OMMT were higher than that of pure PTT.

Abstract: Poly(trimethylene terephthalate) (PTT), and three different rubbers(maleated styrene-butylene-co-ethylene-styrene copolymer (SEBS-g-MA), ethylene-propylene-diene copolymer grafted with maleic anhydride (EPDM-g-MA) and maleic anhydride grafted poly (ethylene-octene) (POE-g-MA)) were mixed in the melt state. Their rheological properties and spherulite morphology were investigated. Rheological properties shows torque decreases with the time increasing for all blends. PTT/SEBS-g-MA blend have better processability than PTT/EPDM-g-MA and PTT/ POE-g-MA blend. Polarizing optical microscopy (POM) experiments showed that the introduction of rubber chain greatly affects the size of the PTT spherulites. Small-sized PTT spherulites were formed when rubber added to PTT.

Abstract: A series of poly(trimethylene terephthalate)/maleinized poly(octene-ethylene) copolymer blends are prepared and their melting, crystallization and dynamic mechanical propwerties were studied by using differential scanning calorimetry (DSC) and dynamic mechanical analyzer (DMA) respectively. The results suggest that the glass transition temperature of the blends shift to higher temperature because of the interaction between PTT and POE components. POE-MAH serves as a nucleating agent for the crystallization of PTT, and it increases the crystallizaiton rate of the blend and the start crystallizaiton temperature, but reduces the degree of crystallinity. Proper content of POE, e.g.1-2%, can improve the elastic modulus of the blend, but too much POE will depress the modulus.

Abstract: The blends of poly (trimethylene terephthalate)(PTT) and maleinized poly (octene-ethylene) copolymer (POE-MAH) were prepared by melt-blending method and their rheology and thermal stability were investigated by using rotational rheometer and thermalgravimetric analyzer (TGA) respectively. The rheological properties of PTT/POE-MAH blends demonstrate that all of the blends belong to the pseudoplastic fluid for their complex viscosity declines with the increasing shear rate. In addition, POE component can strengthen the melt viscosity, so the blend can be processed in the more wider temperature range. Moreover, the complex viscosity become more sensitive to the change of the shear rate, i.e., it decreases more apparently with the increase of the POE-MAH component. The melt flexibility increases apparently with the increase of the POE-g-MAH component. POE-MAH component only has a little depression on the thermal stability of the blends.

Abstract: In this article, the phase morphology and mechanical properties of poly (trimethylene terephthalate)/maleinized poly (octene-ethylene) copolymer blends are studied by using scanning electron microscopy (SEM), polarized optical microscopy (POM), universal material tester and charpy impact tester. The results suggest that the crystal size of the blends decreases obviously and POE component is partly served as nucleating agent for the crystallization of PTT. PTT and POE have good compatibility in blends because the dispersed phase of POE has even dispersion in blends when POE content is lower than 5%; however, the dispersion state of POE becomes poor when POE content is larger than 5%. The impact strength increases to maximum when the POE content is about 4 %. The tensile strength gets to maximum when POE content is 1-2 %.

Abstract: The dynamic mechanical properties, phase morphology and thermal stability of the poly(trimethylene terephthalate)/maleinized poly(octene-ethylene)/organo-montmorillonite nanocomposites (PTT/POE/OMMT) were investigated by using the thermodynamic mechanical analyzer (DMA), transmission electron microscopy (TEM) and thermal gravimetric analyzer (TGA), respectively. The results suggest that the modulus of elasticity of the PTT/POE/OMMT nanocomposite increases, and the glass transition temperature first slightly decreases and then increases with increasing OMMT content because that the TPP plays the role of plasticizer and OMMT plays the role of reinforcing agent. OMMT disperse evenly in the polymer matrix with most of the strip-like sheet morphology. The addition of the OMMT does not apparently affect the thermal stability of the PTT/POE/OMMT nanocomposite.

Abstract: For fabrics, the diversification and superior of the properties and the styles can be achieved by blending fibers. To keep up with the demand of the market, PTT, PLA and Rayon were selected as the materials and 10 kinds of PTT/PLA/Rayon blended fabrics with different fiber content were designed and woven. And then the wearabilities of the fabrics were tested respectively. At last, fuzzy evaluation wad used to discuss the affection of the blended ratio on the fabric’s wearability. The results show that various kinds of wearabilities of the fabric are the best when the blending ratio is PTT/ PLA/Rayon 40/30/30.

Abstract: 1,3-Propanediol (1,3-PDO) has received increasing attention due to usage as the monomer of biopolymer-polytrimethylene terephthalate (PTT) which can be produced from bioresources. For the economic production of 1,3-PDO, the deveolpment of cost effective removal process of by-products such as carboxylic acids from its fermentation broth. Amien-based extraction is the separation process using reactions between amine and materials extracted. The extractabilities for carboxylic acid increased with amine concentration and decreased with pH values. It was also observed that the removal efficiency of carboxylic acids from 1,3-PDO solution was above 90% without any coextraction of 1,3-PDO. From this work, it was found that the amine-based extraction can be promising separation process for the production of pure 1,3-PDO.