Nonisothermal bulk crystallization and subsequent melting behavior of syndiotactic polypropylenes: Crystallization from the melt state

Supaphol, Pitt

doi:10.1002/1097-4628(20001010)78:2<338::aid-app140>3.3.co;2-p

Cited by 24 publications

(31 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Avrami exponents (n) and the corresponding correlation (r 2 ) of the plots at various temperatures of the blend samples are summarized in Table 2. The n values increased with increasing of the temperatures, as previously reported about the crystallization of sPP [44]. The large n values of Bl-75 should be caused by the slow crystallization of sPP in the blend samples.…”

Section: Crystallization Of Spp In the Blend For Short Periodsupporting

confidence: 79%

“…The T c s of the blend samples detected on all the cooling rates are summarized in Table 1. The T c s of sPP in the blend samples decreased with increasing the cooling rate, as previously repoted about the neat sPP [44]. Bl-50, Bl-75, and Bl-90 showed lower T c s than that of the neat sPP.…”

Section: Crystallization Of Spp In the Blend For Short Periodsupporting

confidence: 77%

“…Supahol investigated kinetics of non-isothermal crystallization of sPP by various macro kinetic models, and found that Ozawa model was suitable to study the crystallization kinetics of sPP [44]. We used this model to study the crystallization kinetics of sPP in the sPP-sPB blend samples.…”

Section: Crystallization Of Spp In the Blend For Short Periodmentioning

confidence: 99%

See 2 more Smart Citations

Crystallization and Crystalline Structure of Syndiotactic Polypropylene and Syndiotactic-Poly(1-Butene) Blend

Naga¹,

Takagi²,

Urakami³

et al. 2014

OJPChem

View full text Add to dashboard Cite

The crystallization and crystalline structure of syndiotactic-polypropylene (sPP) and syndiotactic-poly(1-butene) (sPB) blend containing 10 (Bl-10), 25 (Bl-25), 50 (Bl-50), 75 (Bl-75), and 90 (Bl-90) wt% of sPB, have been investigated by means of differential scanning calorimetry (DSC), FT-IR, and wide-angle X-ray diffraction (WAXD) analyses. The melt-crystallization behavior of the blend samples was studied by DSC on the cooling process at constant rates. Bl-50, Bl-75, and Bl-90 showed lower crystallization temperatures than the neat sPP. sPP in Bl-75 showed the lowest crystallization rate among the blend samples. Bl-90 showed a two-phase molten state, and sPP in Bl-90 crystallized via two-stepprocess. Time evolution of FT-IR spectroscopy at room temperature detected conformational transformation of the sPP polymer chain in the blend samples of Bl-50 and Bl-75. The absorption peaks intensity in the FT-IR spectra derived from the helical conformations in the crystalline phase decreased, and the planar zigzag conformations in the amorphous and mesophase phases decreased over the crystallization time. The time evolution of the WAXD profile of Bl-90 indicated that sPP in the blend accelerated the crystallization of sPB. The crystallized Bl-10, Bl-25, and Bl-50 samples showed diffraction peaks in WAXD profiles and melting endothermic peak in DSC profiles derived from only the sPP crystal. The crystallinity and melting temperature of sPP in the crystallized Bl-10, Bl-25, and Bl-50 samples were almost independent of the sPB content. Both the crystalline structure of sPP and sPB were detected in Bl-75 and Bl-90. Bl-75 showed the lowest crystallinity and melting temperature of sPP among the blend samples.

show abstract

Section: Crystallization Of Spp In the Blend For Short Periodsupporting

confidence: 79%

Section: Crystallization Of Spp In the Blend For Short Periodsupporting

confidence: 77%

See 1 more Smart Citation

Crystallization and Crystalline Structure of Syndiotactic Polypropylene and Syndiotactic-Poly(1-Butene) Blend

Naga¹,

Takagi²,

Urakami³

et al. 2014

OJPChem

View full text Add to dashboard Cite

show abstract

“…cooling rates). However, this problem has largely been avoided by dropping off the minus sign in the negative heating rates [23].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Nonisothermal melt-crystallization kinetics for three linear aromatic polyesters

et al. 2003

Self Cite

View full text Add to dashboard Cite

The kinetics of nonisothermal crystallization of three different types of linear aromatic polyester, namely poly(ethylene terephthalate) (PET), poly(trimethylene terephthalate) (PTT), and poly(butylene terephthalate) (PBT), which are different in their number of methylene groups (i.e. 2, 3, and 4 for PET, PTT, and PBT, respectively), was investigated using differential scanning calorimetry (DSC). Analysis of the data was carried out based on the Avrami, Tobin, Ozawa, and Ziabicki models. It was found that the Avrami model provided a more satisfactorily good fit to the experimental data for these polyesters than did the Tobin model. The Ozawa model was found to describe the experimental data fairly well. The Ziabicki's kinetic crystallizability parameter G for these polyesters was found to be of the following order: PBT > PTT > PET. The effective energy barrier for nonisothermal crystallization process of these polyesters, determined by the Friedman method, was found to be an increase function with the relative degree of crystallinity.

show abstract

“…Both quiescent isothermal and non-isothermal melt-crystallization studies revealed that sPP is a slowly crystallizing polymer. [10,11] The addition of nucleating agents may help enhance the crystallization rates by Summary: The effects of various nucleating agents [e.g. 1,3:2,4-dibenzylidene sorbitol (DBS), 1,3:2,4-di-p-methyldibenzilidene sorbitol (MDBS), 1,3:2,4-di-m,p-methylbenzylidene sorbitol (DMDBS), kaolin, talcum, marl, titanium dioxide (TiO 2 ) and silica (SiO 2 )] on non-isothermal melt crystallization and the subsequent melting behavior and mechanical properties of nucleated syndiotactic poly(propylene) (sPP) in comparison with those of the neat sample were investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nucleating Agents on Crystallization and Melting Behavior and Mechanical Properties of Nucleated Syndiotactic Poly(propylene)

Supaphol

Charoenphol

Junkasem

2004

Macro Materials & Eng

Self Cite

View full text Add to dashboard Cite

Summary: The effects of various nucleating agents [e.g. 1,3:2,4‐dibenzylidene sorbitol (DBS), 1,3:2,4‐di‐p‐methyldibenzilidene sorbitol (MDBS), 1,3:2,4‐di‐m,p‐methylbenzylidene sorbitol (DMDBS), kaolin, talcum, marl, titanium dioxide (TiO2) and silica (SiO2)] on non‐isothermal melt crystallization and the subsequent melting behavior and mechanical properties of nucleated syndiotactic poly(propylene) (sPP) in comparison with those of the neat sample were investigated. Analysis of the non‐isothermal melt‐crystallization exotherms revealed that the ability of these fillers to nucleate sPP could be ranked from the best to the worst as follows: DBS > talcum > MDBS > kaolin > SiO2 > DMDBS > marl > TiO2. The subsequent melting endotherms for most of the sPP compounds exhibited double melting peaks, while that for the marl‐filled sPP exhibited triple melting peaks. Wide‐angle X‐ray diffraction analysis showed that addition of these fillers did not affect the crystal modification of the sPP matrix. Mechanical property measurements revealed that both the tensile strength and the percentage of elongation at yield for the sPP compounds investigated were not much different from those of the neat sPP. After natural weathering for 1 month, the tensile strength at yield for the sPP compounds investigated increased, at the expense of the percentage of elongation at yield, but, after natural weathering for 3 months, both the tensile strength and the percentage of elongation at yield were found to decrease.Effects of various organic and inorganic nucleating agents on non‐isothermal melt‐crystallization of syndiotactic poly(propylene) (recorded at a cooling rate of 10 °C · min−1).magnified imageEffects of various organic and inorganic nucleating agents on non‐isothermal melt‐crystallization of syndiotactic poly(propylene) (recorded at a cooling rate of 10 °C · min−1).

show abstract

Nonisothermal bulk crystallization and subsequent melting behavior of syndiotactic polypropylenes: Crystallization from the melt state

Cited by 24 publications

References 13 publications

Crystallization and Crystalline Structure of Syndiotactic Polypropylene and Syndiotactic-Poly(1-Butene) Blend

Crystallization and Crystalline Structure of Syndiotactic Polypropylene and Syndiotactic-Poly(1-Butene) Blend

Nonisothermal melt-crystallization kinetics for three linear aromatic polyesters

Effect of Nucleating Agents on Crystallization and Melting Behavior and Mechanical Properties of Nucleated Syndiotactic Poly(propylene)

Contact Info

Product

Resources

About