Development of low isotactic polyolefin

Minami, Yutaka; Takebe, Toshihiko; Kanamaru, Masami; Okamoto, Takuji

doi:10.1038/pj.2014.110

Cited by 12 publications

(5 citation statements)

References 14 publications

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“…Kanai et al controlled the crystallization speed of iPP with low molecular low modulus polypropylene (LMPP), which has low crystallinity and low melt temperature [4]. Moreover, such PPs with high molecular weight and low isotacticity are synthesised with certain doubly bridged metallocene complexes [5]. Due to its unique elastomeric properties and compatibility with iPP, LMPP can be applicable to hot melt adhesives, elastic fibres, nonwoven fabrics and so on [5].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Mechanical and Thermal Properties of iPP and LMPP Blend Fibres by Surface Response Methodology

et al. 2018

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Optimization of the mechanical and thermal properties of isotactic polypropylene (iPP) homopolymer blended with relatively new low molecular low modulus polypropylene (LMPP) at different blend ratios was carried out via surface response methodology (RSM). Regression equations for the prediction of optimal conditions were achieved considering eight individual parameters: naming, elongation at break, tensile strength and elastic modulus, crystallization temperature (TC), first melting temperatures (TM1), heat fusion (Hf), crystallinity, and melt flow rate (MFR), which were measured as responses for the design of experiment (DOE). The adjusted and predicted correlation coefficient (R2) shows good agreement between the actual and the predicted values. To confirm the optimal values from the response model, supplementary experiments as a performance evaluation were conducted, posing better operational conditions. It has been confirmed that the RSM model was adequate to reflect the predicted optimization. The results suggest that the addition of LMPP into iPP could effectively enhance the functionality and processability of blend fibres if correctly proportioned.

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Section: Introductionmentioning

confidence: 99%

“…Moreover, such PPs with high molecular weight and low isotacticity are synthesised with certain doubly bridged metallocene complexes [5]. Due to its unique elastomeric properties and compatibility with iPP, LMPP can be applicable to hot melt adhesives, elastic fibres, nonwoven fabrics and so on [5].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Mechanical and Thermal Properties of iPP and LMPP Blend Fibres by Surface Response Methodology

et al. 2018

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“…De Rosa et al and Minami et al prepared PP samples with precisely controlled stereoregularity using diverse molecular catalysts, and showed that their thermal and mechanical properties were correlated with stereo-defects. [8,9] The former group further examined the effects of stereo-defects and cooling rate during molding on crystal polymorphism, and clarified the relationship between mesomorphic phase formation and physical properties. [10] Nishida et al used PP samples with different stereoregularities to quantitatively estimate the threshold of stereoregularity at which mesomorphic phase forms.…”

Section: Introductionmentioning

confidence: 99%

Physical Properties of Isotactic Polypropylene Blended with Less Crystalline Polypropylene

Wada

Kitabayashi

Chammingkwan

et al. 2022

Macro Reaction Engineering

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The physical properties of polymeric materials, which are mixtures of various molecules, are determined by the sum of their contributions. Industrially important isotactic polypropylene (iPP), which is produced using heterogeneous Ziegler–Natta catalysts, shows broader distributions of molecular weight and stereoregularity because of the multisite nature, compared to molecular catalysts. However, systematic studies on the effects of these distributions on physical properties are lacking, especially for variations in stereoregularity. In this study, polypropylene (PP) additives with various molecular weights and stereoregularities (and their distributions) are added to an iPP matrix to clarify the effects of low‐concentration components on the overall physical properties. The results indicate the importance of incorporating the PP additives into the crystal structure of the iPP matrix.

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“…[3] The most important parameter to control the macroscopic properties of the resultant polypropylene is its stereoregularity.F or example,highly isotactic crystalline polypropylene is used as arigid material and exhibits high toughness. [3] Polypropylene with low levels of isotacticity shows good elastomeric properties, [4] while syndiotactic polypropylene displays other unique properties,s uch as high impact strength and optical clarity. [5] Therefore,c ontrol over regio-and stereoregularity is crucial in any type of propylene polymerization.…”

mentioning

confidence: 99%

“…In addition, another complementary triad test was performed:I ft he stereoregularity is determined by enantiomorphic site control, the value for 2[rr]/[mr]should approach 1 [26]. In the case of catalysts 1e-1h (entries 5-8),4[mm]-[rr]/[mr] 2 values of 1.79-3.37 were calculated, and these are substantially larger than that obtained with 1d(entry 4; 1.35).…”

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confidence: 99%

Crystalline Isotactic Polar Polypropylene from the Palladium‐Catalyzed Copolymerization of Propylene and Polar Monomers

Ota

Ito

Kobayashi³

et al. 2016

Angewandte Chemie

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Moderately isospecific homopolymerization of propylene and the copolymerization of propylene and polar monomers have been achieved with palladium complexes bearing ap hosphine-sulfonate ligand. Optimization of substituents on the phosphorus atom of the ligand revealed that the presence of bulky alkyl groups (e.g.menthyl) is crucial for the generation of high-molecular-weight polypropylenes (M w % 10 4 ), and the substituent at the ortho-position relative to the sulfonate group influences the molecular weight and isotactic regularity of the obtained polypropylenes.S tatistical analysis suggested that the introduction of substituents at the orthoposition relative to the sulfonate group favors enantiomorphic site control over chain end control in the chain propagation step.T he triad isotacticity could be increased to mm = 0.55-0.59, with formation of crystalline polar polypropylenes,a s supported by the presence of melting points and sharp peaks in the corresponding X-ray diffraction patterns. Y okkaichi, Mie, Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under http://dx.

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Development of low isotactic polyolefin

Cited by 12 publications

References 14 publications

Optimization of Mechanical and Thermal Properties of iPP and LMPP Blend Fibres by Surface Response Methodology

Optimization of Mechanical and Thermal Properties of iPP and LMPP Blend Fibres by Surface Response Methodology

Physical Properties of Isotactic Polypropylene Blended with Less Crystalline Polypropylene

Crystalline Isotactic Polar Polypropylene from the Palladium‐Catalyzed Copolymerization of Propylene and Polar Monomers

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