Crystallization behavior and optical properties of isotactic polypropylene filled with α-nucleating agents of multilayered distribution

Luo, Shanshan; Wei, Liangqiang; Sun, Jie; Huang, Anrong; Qin, Shuhao; Luo, Hang; Gao, Chengtao; Zheng, Yu; Shen, Jiabin

doi:10.1039/c9ra09485g

Cited by 7 publications

(6 citation statements)

References 36 publications

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“…Isotactic polypropylene (iPP) is one of the most widely applied thermoplastic polymers due to its desirable properties, including good mechanical properties, excellent chemical and moisture resistance, versatile processability, and low manufacturing cost [ 1 , 2 ]. It is widely used in pipes, packing materials, and separators materials [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effects of MXene and β-Nucleating Agent on the Crystallization Behavior of Isotactic Polypropylene

Peng

Kang

Song³

et al. 2021

Polymers

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The effects of MXene on the crystallization behavior of β-nucleated isotactic polypropylene (iPP) were comparatively studied. The commonly used MXene Ti3C2Tx was prepared by selective etching and its structure and morphology were studied in detail. Then MXene and a rare earth β-nucleating agent (NA) WBG-II were nucleated with iPP to prepare samples with different polymorphic compositions. The crystallization, melting behavior, and morphologies of neat iPP, iPP/MXene, iPP/WBG-II, and iPP/MXene/WBG-II were comparatively studied. The crystallization behavior analysis reveals that a competitive relationship exists between MXene and WBG-II when they were compounded as α and β nucleating agents. In the system, the β-nucleation efficiency (NE) of WBG-II is higher than α-NE of MXene. The β-phase has relatively low thermal stability and would transform to α-phase when cooled below a critical temperature.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Effects of MXene and β-Nucleating Agent on the Crystallization Behavior of Isotactic Polypropylene

Peng

Kang

Song³

et al. 2021

Polymers

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“…Studies on the effect of thermoplastic crystallinity on optical properties revealed that the dimensions of the spherulites affect light transmission through the polymer. Transmission is higher in materials with very small spherulites, while haze is higher in parts with larger spherulites [ 15 , 17 , 18 , 19 , 20 , 21 ]. The crystalline structure can be found in two most common configurations: alpha and beta.…”

Section: Introductionmentioning

confidence: 99%

“…In order to vary the dimensions of the spherulites, nucleating and clarifying agents can be incorporated into the polymer matrix, which promote an increase in the number of crystallization active centers. Additives can also be added to speed up the crystallization process, favoring the appearance of alpha spherulites, which will be smaller and have less influence on the optical properties of the final part [ 19 ]. As a general rule, the lower the percentage of alpha crystallites, the better the optical properties of the final parts.…”

Section: Introductionmentioning

confidence: 99%

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From Transparent to Opaque: A Route towards Multifunctional Parts Injected with a Single Material

Pedroso,

Pontes,

Alves

et al. 2023

Materials

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The technological, social and economic development observed in recent decades brought an exponential increase in consumption and inherent new challenges. Recycling is one of the best solutions to minimize the environmental impact of raw materials. However, multi-material components are difficult or even impossible to recycle. The present work focuses on the reduction in the number of different materials used in multifunctional components. In particular, it intends to assess the potential of injecting molding grades of polypropylene (PP) to produce parts with transparency (haze) gradients. Firstly, several polypropylene grades of different types were identified and injected under various thermal processing conditions, i.e., injection temperature and mold temperature, in order to vary the cooling rate, influencing the growth rate of the spherulites and eventually the presence/absence of α and β crystalline zones. The injected parts’ optical properties were then characterized, and the most promising PP grades were identified and selected for subsequent work, namely grade DR 7037.01, showing the widest range of haze (from 29.2 to 68.7%). and PP070G2M, presenting the highest haze value (75.3%). Finally, in an attempt to understand the origin of the haze variations observed, the parts injected with the selected PP grades were further characterized through differential scanning calorimetry (DSC) and polarized light microscopy. It was concluded that the main factor causing the observed haze difference was, apart from the size of the spherulites, the presence of internal layers with different birefringence and, therefore, different refractive indices.

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“…Thereby accelerating PLLA's crystallization seems to be very significant for strengthening practical application in relevant fields. Through the exploration and comparison for many years, adding a nucleating agent is thought to be a very good way of promoting the crystallization of polymer [17,18], because a nucleating agent can reduce the surface free energy barrier toward nucleation and induce the occurance of crystallization; and this method has already widely applied in semicrystalline polymers, including polyethylene terephthalate [19] and polypropylene [20,21], to enhance their crystallization performances. Similarly, this method can also be employed in PLLA as another semi-crystalline polymer.…”

Section: Introductionmentioning

confidence: 99%

The Application of N, N -bis(Isonicotinic Acid) 1, 4-Naphthalenedicarboxylic Acid Dihydrazide in Biodegradable Poly(L-lactide): Crystalline Nucleation, Melting Behavior, Thermal Stability and Mechanical Properties

Xia¹,

Cai²,

Wang³

et al. 2022

Mater. Plast.

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Improving the crystallization performance of poly(L-lactide) (PLLA) is necessary to adapt for various applications. In the current work, N, N -bis(isonicotinic acid) 1, 4-naphthalenedicarboxylic acid dihydrazide (NAIAH) was synthesized to be firstly aimed at promoting the crystallization of PLLA, and the NAIAH-nucleated PLLA materials were prepared using PLLA as a matrix material and NAIAH as a nucleating agent, and the crystalline nucleation, melting behavior, thermal decomposition and mechanical properties of PLLA/NAIAH samples were investigated by the relevant testing instruments. The results from the non-isothermal melt-crystallization from the melt of 190oC indicated that the NAIHA could significantly accelerate PLLA�s crystallization, and played an efficient heterogeneous nucleation in PLLA�s crystallization. The effect of different final melting temperatures on PLLA�s melt-crystallization behavior showed that a relatively low final melting temperature was beneficial for the crystallization of PLLA, and the 170oC was the optimum final melting temperature in this study. An increase of cooling rate could weaken PLLA/NAIAH�s crystallization ability, but the NAIAH was still able to promote PLLA�s crystallization upon the fast cooling at 50oC/min, showing a powerful crystallization accelerating effect of NAIAH. PLLA/NAIAH�s melting behaviors after different crystallization conditions were affected by heating rate and crystallization temperature, and the double melting peaks appeared in melting DSC curves were assigned to melting-recrystallization. Thermal decomposition processes in air showed that the NAIAH decreased PLLA�s thermal stability, but the interaction of PLLA with NAIAH had an inhibition for a drop in onset decomposition temperature. Additionally, the introduction of NAIAH dramatically reduced PLLA�s tensile modulus and elongation at break.

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Crystallization behavior and optical properties of isotactic polypropylene filled with α-nucleating agents of multilayered distribution

Abstract: Isotactic polypropylene (iPP)-based multilayered composites containing alternating layers of pure iPP and α-nucleating agents (α-NAs)-filled iPP (αPP) were fabricated through layer-multiplying co-extrusion technology.

Cited by 7 publications

References 36 publications

Investigation on the Effects of MXene and β-Nucleating Agent on the Crystallization Behavior of Isotactic Polypropylene

Investigation on the Effects of MXene and β-Nucleating Agent on the Crystallization Behavior of Isotactic Polypropylene

From Transparent to Opaque: A Route towards Multifunctional Parts Injected with a Single Material

The Application of N, N -bis(Isonicotinic Acid) 1, 4-Naphthalenedicarboxylic Acid Dihydrazide in Biodegradable Poly(L-lactide): Crystalline Nucleation, Melting Behavior, Thermal Stability and Mechanical Properties

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