Preparation of poly(butylene terephthalate)/modified organoclay nanocomposite via <i>in-situ</i> polymerization

Heidarzadeh, Nina; Rafizadeh, Mehdi; Taromi, Faramarz Afshar; Bouhendi, H.

doi:10.1177/0954008312446646

Cited by 12 publications

(12 citation statements)

References 41 publications

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“…The predominant amorphous phase was characterized by a single glass transition temperature that ranged between -28 ºC and -39 ºC and increased with increasing the terephthalate content. This amorphous phase was constituted by the random sequences including both terephthalate and sebacate units and appeared at intermediate temperatures of those reported for PBT (66 ºC[25,26]) and PBSe (-59 ºC[27]). Glass transitions corresponding to terephthalate-and sebacate-rich phases were not detected in DSC scans since the more regular sequences are expected to be incorporated in the corresponding crystalline phases.…”

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confidence: 80%

Biodegradability and biocompatibility of copoly(butylene sebacate-co-terephthalate)s

Heidarzadeh

Rafizadeh

Taromi

et al. 2017

Polymer Degradation and Stability

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In the present study poly (butylene sebacate-co-terephthalate)s having different compositions were synthesized with a high yield and a random distribution by thermal transesterification of poly (butylene sebacate) and poly (butylene terephthalate) homopolymers. The copolymer with the highest comonomer ratio was the least crystalline sample, although the melting peaks corresponding to both, sebacate and terephthalate-rich phases were still observable in calorimetric heating runs. This copolymer was associated with interesting thermal and mechanical properties, as the maximum melting point was higher than 100 °C and the storage modulus was also high (i.e. 1.1 × 109 N/m2 and 1.7 108 N/m2 were determined just before and after the main glass transition temperature of -12 °C).\ud \ud As all studied samples were thermally stable up to temperatures clearly higher than the fusion temperature, they could be easily processed. Increasing the terephthalate content of the copolymers resulted in higher hydrophobicity, which had a minor influence on cell adhesion and proliferation of both fibroblast-like and epithelial-like cells. Hydrolytic and enzymatic degradability were assessed and the effect of composition and crystallinity on the degradation rate was investigated. Molecular weight measurements during exposure to a hydrolytic media indicated a first order kinetic mechanism during the initial stages of degradation before reaching a limiting molecular size, which was indicative of solubilization. The most amorphous sample appears as a highly promising biodegradable material since it showed a significant weight loss during exposure to all selected degradation media, but also exhibited good performance and properties that were comparable to those characteristic of polyethylenePeer ReviewedPostprint (author's final draft

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confidence: 80%

Biodegradability and biocompatibility of copoly(butylene sebacate-co-terephthalate)s

Heidarzadeh

Rafizadeh

Taromi

et al. 2017

Polymer Degradation and Stability

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“…Like our previous work, the organoclay could be modified. Briefly, after drying nanoclay in a vacuum oven at 60 °C, 1 g of OMMT was added to 25 mL of ethanol/APS (95/5, v/v) and the mixture was refluxed for 6 h. Then the mixture was washed continuously by ethanol/deionized water (75/25, v/v) and finally was dried at 60 °C overnight.…”

Section: Experimental Sectionmentioning

confidence: 92%

Fuzzy Optimization Approach for the Synthesis of Polyesters and Their Nanocomposites in In-Situ Polycondensation Reactors

Zahedi

Rafizadeh

2017

Ind. Eng. Chem. Res.

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A proportional-derivative (PD) fuzzy controller was presented to control the temperature of a polycondensation reactor. Synthesis of various polyesters and copolyesters were conducted using the devised controller. This controller uses reactor temperature error as well as its derivative. The desired jacket temperature had an uncertainty that was affected by noise and disturbance. This uncertainty was modeled using fuzzy numbers, and a fuzzy trajectory was achieved for the desired reactor temperature. Then, a generalized Takagi−Sugeno (GTS) fuzzy controller was designed. An adaptation algorithm was included in the controller. Compared to that of conventional proportional-integral-derivative (PID) controllers, experimental results presented a very good performance to control the reactor temperature of in-situ polymerization of polyesters. Although the PID controller finally controlled the temperature with an accuracy of ±6 °C, the temperature overshoot was around 20 °C which could completely degrade the polymer. However, the fuzzy PD controller had no overshoot. The performance of the fuzzy PD controller to control a suitable temperature of the reactor was excellent with 0.2% accuracy without overshoot. The NMR results confirmed that the final polymers have been synthesized successfully. Moreover, the molecular weights of the samples, synthesized under fuzzy control, were generally higher and there was a better intercalation structure in such samples.

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“…As a result, it is widely used in electronics and electrical appliances, the automobile industry and its related machinery, instruments, and household appliances [ 18 , 19 , 20 , 21 , 22 ]. However, its disadvantages of low heat deflection temperature and high impact sensitivity limit its development for some applications and require significant improvement [ 23 , 24 , 25 , 26 , 27 ]. In general, calcium carbonate [ 28 ], glass fibers [ 29 , 30 , 31 , 32 ], carbon fibers [ 33 ], montmorillonite [ 34 ], and carbon nanotubes [ 35 , 36 ] are commonly used as PBT reinforcements [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Artificial Marble Wastes on Heat Deflection Temperature, Crystallization, and Impact Properties of Polybutylene Terephthalate

Feng

Fang

et al. 2021

Polymers

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As artificial marble is abundant and widely used in residential and commercial fields, the resource utilization of artificial marble wastes (AMWs) has become extremely important in order to protect the environment. In this paper, polybutylene terephthalate/artificial marble wastes (PBT/AMWs) composites were prepared by melt blending to maximize resource utilization and increase PBT performance. The research results showed that the filling of AMWs was beneficial to the improvement of PBT-related performance. X-ray diffraction analysis results indicated that after filling AMWs into the PBT matrix, the crystal structure of PBT was not changed. Heat deflection temperature (HDT) analysis results indicated that the HDT of PBT composites with 20 wt% AMWs reached 66.68 °C, which was 9.12 °C higher than that of neat PBT. Differential scanning calorimetry analysis results showed that heterogeneous nucleation could be well achieved when the filling content was 15 wt%; impact and scanning electron microscope analysis results showed that due to the partial core-shell structure of the AMWs, the impact strength of PBT was significantly improved after filling. When the filling amount was 20 wt%, the impact strength of the PBT composites reached 23.20 kJ/m2, which was 17.94 kJ/m2 higher than that of neat PBT. This research will not only provide new insights into the efficient and high-value utilization of AMWs, but also provide a good reference for improved applications of other polymers.

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Preparation of poly(butylene terephthalate)/modified organoclay nanocomposite via in-situ polymerization

Cited by 12 publications

References 41 publications

Biodegradability and biocompatibility of copoly(butylene sebacate-co-terephthalate)s

Biodegradability and biocompatibility of copoly(butylene sebacate-co-terephthalate)s

Fuzzy Optimization Approach for the Synthesis of Polyesters and Their Nanocomposites in In-Situ Polycondensation Reactors

The Impact of Artificial Marble Wastes on Heat Deflection Temperature, Crystallization, and Impact Properties of Polybutylene Terephthalate

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