Effect of Arenga Pinnata “Ijuk” Fiber as Nucleating Agent on Crystallization Kinetics of Impact Polypropylene Copolymer

2018 ◽  
Vol 923 ◽  
pp. 56-60 ◽  
Author(s):  
Mochamad Chalid ◽  
Evana Yuanita ◽  
Ghiska Ramahdita ◽  
Jaka Fajar Fatriansyah
Keyword(s):  
Crystal Growth ◽  
Crystallization Kinetics ◽  
Nucleating Agent ◽  
Avrami Equation ◽  
Nucleating Agents ◽  
Impact Polypropylene Copolymer ◽  
Kinetics Of

Impact Polypropylene Copolymer (IPC) is one of the PP type which is widely used. IPC was made with addition of ethylene in PP which decreases PP crystallinity. Many efforts have been made to improve the properties of PP crystallinity by addition of nucleating agents. In this study, we use Arenga Pinnata “Ijuk” fiber as PP nucleating agent. In order to determine the effect of “Ijuk” fiber as nucleating agents in kinetics aspect, we used DSC measurement based on Avrami equation. The results showed that the addition of ijuk decreases crystallizationhalf timeand dimension of crystal growth which indicate the effects of “Ijuk” fiber as a nucleating agent.

The Crystallization Kinetics of Polypropylene/Organo Montmorillonite Nanocomposites Modified with Calcium Pimelate

2013 ◽  
Vol 747 ◽  
pp. 749-752
Author(s):  
Nattha Thanomchaem ◽  
Wunpen Chonkaew
Keyword(s):  
Crystallization Kinetics ◽  
Nucleating Agent ◽  
Crystal Form ◽  
Avrami Equation ◽  
Crystallization Time ◽  
Relative Crystallinity ◽  
Twin Screw ◽  
Higher Temperature ◽  
Kinetics Of ◽  
Montmorillonite Nanocomposites

Polypropylene/organo montmorillonite nanocomposites modified with 0.001-0.1 wt% calcium pimelate, a β-nucleating agent, were prepared using twin screw extruder. The effects of calcium pimelate content on crystallization behavior were investigated using differential scanning calorimeter (DSC). The crystallization kinetics were studied using both nonisothermal and isothermal methods. The development of relative crystallinity with the crystallization time was analyzed by the Avrami equation. For nonisothermal studies, the Kissingers theory was employed and the crystallization activation energy was calculated. The results showed that the crystallization temperature shifted to a higher temperature range when calcium pimelate was added. The alpha crystal form of polypropylene nanocomposite was suppressed, by the additions of calcium pimelate, while beta crystallization reaction was accelerated.

scholarly journals Morphology and crystallization kinetics of Rubber-modified Nylon 6 Prepared by Anionic In-situ Polymerization

2020 ◽  
Vol 27 (1) ◽  
pp. 204-215
Author(s):  
Hongkai Zhao ◽  
Dengchao Zhang ◽  
Yingshuang Li
Keyword(s):  
Crystallization Kinetics ◽  
In Situ Polymerization ◽  
Good Description ◽  
Nylon 6 ◽  
Avrami Equation ◽  
Infrared Analysis ◽  
Chain Segment ◽  
The Impact ◽  
Kinetics Of

AbstractIn this work, we modified nylon 6 with liquid rubber by in-situ polymerization. The infrared analysis suggested that HDI urea diketone is successfully blocked by caprolactam after grafting on hydroxyl of HTPB, and the rubber-modified nylon copolymer is generated by the anionic polymerization. The impact section analysis indicated the rubber-modified nylon 6 resin exhibited an alpha crystal form.With an increase in the rubber content, nylon 6 was more likely to generate stable α crystal. Avrami equation was a good description of the non-isothermal crystallization kinetics of nylon-6 and rubber-modified nylon-6 resin. Moreover, it is found that the initial crystallization temperature of nylon-6 chain segment decreased due to the flexible rubber chain segment. n value of rubber-modified nylon-6 indicated that its growth was the coexistence of two-dimensional discoid and three-dimensional spherulite growth. Finally, the addition of the rubber accelerated the crystallization rate of nylon 6.

Research on Crystallization Kinetics of Calcium Sulfate Dihydrate Prepared by Bittern under 20°C and 120r/min Condition

2014 ◽  
Vol 926-930 ◽  
pp. 210-213
Author(s):  
Bi Jun Luo ◽  
Hai Hong Wu ◽  
Yu Qi Wang ◽  
Qi Zhang
Keyword(s):  
Experimental Data ◽  
Crystal Growth ◽  
Crystallization Kinetics ◽  
Residence Time ◽  
Calcium Sulfate ◽  
Nucleation Density ◽  
Growth Line ◽  
Calcium Sulfate Dihydrate ◽  
Kinetics Of

Crystallization kinetics experiment of calcium sulfate dehydrates, which is prepared by bittern under 20°C and 120r/min conditions, is carried out. According to the results of the experimental data, nucleation densityn0of gypsum crystals is proportional to the residence time, and the rate of crystal growth lineGis inversely proportional to the residence time. Meanwhile, the crystallization kinetics formula is derived to be:B0= 5.78×102G0.87.

Crystallization Kinetics of Organic–Inorganic Trihalide Perovskites and the Role of the Lead Anion in Crystal Growth

2015 ◽  
Vol 137 (6) ◽  
pp. 2350-2358 ◽  
Author(s):  
David T. Moore ◽  
Hiroaki Sai ◽  
Kwan W. Tan ◽  
Detlef-M. Smilgies ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Crystallization Kinetics ◽  
Kinetics Of

A Study of the Crystallization Behaviour of Dynamically Vulcanized EPDM/Nylon Copolymer Blends

2003 ◽  
Vol 11 (6) ◽  
pp. 449-463
Author(s):  
Xin Liu ◽  
Hua Huang ◽  
Yong Zhang ◽  
Yinxi Zhang
Keyword(s):  
Crystallization Process ◽  
Nucleating Agent ◽  
Avrami Equation ◽  
Relative Crystallinity ◽  
Epdm Rubber ◽  
Chlorinated Polyethylene ◽  
Copolymer Blends ◽  
Dispersed Particles ◽  
Kinetics Of ◽  
Diene Rubber

In this work the crystallization kinetics of polyamide copolymer (PA) in PA/ ethylene-propylene-diene rubber (EPDM) thermoplastic vulcanizates was studied under non-isothermal and isothermal conditions from the melt. A differential scanning calorimeter was used to monitor the energetics of the crystallization process. The effects of rubber, compatibilizer, vulcanizing agents, and the process methods on the isothermal and non-isothermal crystallization of PA were investigated. Relative crystallinity develops in accordance with the time dependence described by the Avrami equation with the exponent n ≈ 3. The experimental results show that the EPDM rubber is not the nucleating agent in those samples that were not dynamically vulcanized. The addition of chlorinated polyethylene has no effect on the crystallization of PA. But in dynamically vulcanized samples the EPDM rubber is a nucleating agent and the addition of chlorinated polyethylene helps the EPDM to form fine and well-dispersed particles and improves the crystallization of PA.

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