Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Saikrasun, Sunan; Saengsuwan, Sayant

doi:10.1016/j.jmatprotec.2008.08.005

Cited by 17 publications

(12 citation statements)

References 25 publications

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“…For example, T 2% of the PE20COC80 blend is about 100°C higher than that of the neat PE matrix. As reported in literature [66,67], it is probable that the presence of a second component with higher thermal stability limits the diffusion of the oxygen through the sample, thus delaying the degradation process of the PE component. For as concerns DMTA tests, storage modulus (E') of the blends at different temperatures and the glass transition temperature (T g ) of the COC component, evaluated from tan$ peaks, are summarized in Table 3.…”

Section: Dorigato Et Al -Express Polymer Letters Vol5 No1 (2011) mentioning

confidence: 90%

Linear low density polyethylene/cycloolefin copolymer blends

Dorigato¹,

Pegoretti²,

Fambri³

et al. 2011

Express Polym. Lett.

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Abstract. Linear low density polyethylene (LLDPE) was melt compounded with various amounts of a cycloolefin copolymer (COC). Scanning and transmission electron microscopy evidenced, at qualitative level, some interfacial adhesion between LLDPE and COC. Another indication of interactions between the components was the increase of crystallinity degree with rising COC content and the enhancement of COC glass transition temperature with the LLDPE fraction. In order to explain this behaviour, the incorporation of ethylene segments of COC into the LLDPE crystalline phase, leading to an increased number of norbornene units in the remaining COC component undergoing the glass transition, was hypothesized. The thermo-oxidative degradation stability of LLDPE was substantially enhanced by COC introduction for filler contents higher than 20 wt%, especially when an oxidative atmosphere was considered. An increasing fraction of COC in the blends was responsible for an enhancement of the elastic modulus and of a decrease in the strain at break, while tensile strength passed through a minimum, in agreement with the model predictions based on the equivalent box model and equations provided by the percolation theory. The introduction of a rising COC amount in the blends increased the maximum load sustained by the samples in impact tests, but decreased the blend ductility. Concurrently, a significant reduction of the creep compliance of LLDPE was observed for COC fractions higher than 20 wt%.

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Section: Dorigato Et Al -Express Polymer Letters Vol5 No1 (2011) mentioning

confidence: 90%

Linear low density polyethylene/cycloolefin copolymer blends

Dorigato¹,

Pegoretti²,

Fambri³

et al. 2011

Express Polym. Lett.

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show abstract

“…It can be seen that massive fibers formed by breaking up of the network structures, as an enormous Fig. 1 Frequency dependence of a viscosity and elastic modulus for PTT and CAB at 240°C, b viscosity ratio and elasticity ratio of PTT/ CAB system reduction in phase size took place from sample (1, 2) to sample (3,4). Therefore, the metaphase development of the polyester dispersed phase can be described as the formation of fibers.…”

Section: Formation Mechanismmentioning

confidence: 99%

“…2, two different representative SEM images can be observed from each sampling location. Samples (1, 2), (3,4), and (5, 6) displayed the morphology of initial, metaphase and later phase development of PTT dispersed phase, respectively.…”

Section: Formation Mechanismmentioning

confidence: 99%

“…Therefore, the initial morphology development procedure for the dispersed phase of PTT in the matrix was from pellets to sheets or ribbons, then formed holes and network structures. Sample (3,4) in Fig. 2 show the metaphase development of PTT dispersed phase.…”

Section: Formation Mechanismmentioning

confidence: 99%

“…Based on certain conditions, one material can exist in the other material as the form of fibers, socalled in situ fibrillar blends. These materials, however, mainly focused on the in situ composites with improved mechanical properties, such as polypropylene/poly(ethylene terephthalate), thermotropic liquid crystal polymers/ poly(ethylene terephthalate), polycarbonate/high density polyethylene, polypropylene/polyamide-6, polypropylene/ polystyrene, and so on [4][5][6][7][8][9][10]. Besides this, in situ composites also provide a method to prepare nanofibers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Morphology development and size control of poly(trimethylene terephthalate) nanofibers prepared from poly(trimethylene terephthalate)/cellulose acetate butyrate in situ fibrillar composites

Xiao

Sun

2011

J Mater Sci

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Formation of nano-fibrillar composite structures provides an effective method for preparing thermoplastic nanofibers. By mixing two immiscible thermoplastic polymers in a twin screw extruder, poly(trimethylene terephthalate) (PTT) formed nano-fibrillar morphology in cellulose acetate butyrate (CAB) matrix, and then PTT nanofibers were obtained from PTT/CAB in situ fibrillar composites after removing the matrix phase of CAB. Blend ratio, shear rate, and draw ratio were three important parameters in the extrusion process, which could affect the shape and size of nanofibers. By varying the process conditions, average diameter of PTT nanofibers could be controlled in the range of 80-400 nm. Besides this, the mechanism of nano-fibrillar formation in PTT/CAB blends was also studied by collecting samples at different stages in the extruder. The morphology developmental trends of PTT dispersed phase with different blend ratios were nearly the same. From initial to metaphase and later phase development, the PTT dispersed component undergo the formation of sheets, holes, and network structures, then the size reduction and formation of nanofibers.

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Thermo‐oxidative decomposition kinetics of elastomeric composites based on styrene‐(ethylene‐butylene)‐styrene triblock copolymer and organomontmorillonite

Saikrasun¹,

Amornsakchai²

2011

J of Applied Polymer Sci

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ABSTRACT:The elastomeric nanocomposites based on organomontmorillonite (OMMT) and styrene-(ethylenebutylene)-styrene (SEBS) thermoplastic elastomer were prepared by melt processing using maleic anhydride grafted SEBS (SEBS-g-MA) as compatibilizer. Thermo-oxidative decomposition behavior of the neat components and the nanocomposites were investigated using thermogravimertic analysis (TGA) in air atmosphere. The isoconversional method is employed to study the kinetics of thermo-oxidative degradation. The heating modes and the composition of nanocomposites were found to affect the kinetic parameters (E a , lnA and n). The E a and lnA values of SEBS, OMMT, and their composites are much higher under dynamic heating than under isothermal heating. The reaction order (n) of OMMT was lower than those of SEBS and their composites. The obtained TG profiles and calculated kinetic parameters indicated that the incorporation of OMMT into SEBS significantly improved the thermal stability both under dynamic heating and under isothermal heating. The simultaneously obtained DSC data showed that the enthalpy of thermal decomposition decreased with OMMT loading. No significant change in the nonisothermal and isothermal stability of the nanocomposites with addition of SEBS-g-MA.

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Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Cited by 17 publications

References 25 publications

Linear low density polyethylene/cycloolefin copolymer blends

Linear low density polyethylene/cycloolefin copolymer blends

Morphology development and size control of poly(trimethylene terephthalate) nanofibers prepared from poly(trimethylene terephthalate)/cellulose acetate butyrate in situ fibrillar composites

Thermo‐oxidative decomposition kinetics of elastomeric composites based on styrene‐(ethylene‐butylene)‐styrene triblock copolymer and organomontmorillonite

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