Influence of a sorbitol-based nucleating agent modified with silsesquioxanes on the non-isothermal crystallization of isotactic polypropylene

2013 ◽  
Vol 131 (8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Mateusz Barczewski ◽  
Monika Dobrzyńska-Mizera ◽  
Beata Dudziec ◽  
Tomasz Sterzyński
Keyword(s):  
Isotactic Polypropylene ◽  
Isothermal Crystallization ◽  
Nucleating Agent

Variation of non-isothermal crystallization behavior of isotactic polypropylene with varying β-nucleating agent content

2010 ◽  
Vol 59 (10) ◽  
pp. 1441-1450 ◽  
Author(s):  
Linli Xu ◽  
Xiuju Zhang ◽  
Kai Xu ◽  
Shaoquan Lin ◽  
Mingcai Chen
Keyword(s):  
Isotactic Polypropylene ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Nucleating Agent

Isothermal and non-isothermal crystallization of isotactic polypropylene in the presence of an α nucleating agent and zeolite 13X

2018 ◽  
Vol 667 ◽  
pp. 9-18 ◽  
Author(s):  
Xin Meng ◽  
Weiguang Gong ◽  
Weijie Chen ◽  
Yaoqi Shi ◽  
Yan Sheng ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Isothermal Crystallization ◽  
Nucleating Agent ◽  
Zeolite 13X

Non-isothermal crystallization kinetics of isotactic polypropylene nucleated with nucleating agent bicyclic [2,2,1] heptane di-carboxylate

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Yue-fei Zhang ◽  
Xun Li ◽  
Xian-shan Wei
Keyword(s):  
Crystallization Kinetics ◽  
Isotactic Polypropylene ◽  
Growth Pattern ◽  
Isothermal Crystallization ◽  
Three Dimensional ◽  
Nucleating Agent ◽  
Isothermal Crystallization Kinetics ◽  
Spontaneous Nucleation ◽  
Spherulite Growth ◽  
Kinetics Of

AbstractBicyclic [2,2,1] heptane di-carboxylate (commercial product name: HPN- 68) is a novel nucleating agent with high nucleation efficiency for isotactic polypropylene (iPP). In this paper, the non-isothermal crystallization kinetics of virgin iPP and iPP nucleated with HPN-68 were investigated by means of a differential scanning calorimeter (DSC).The Caze method was used to analyze the non-isothermal crystallization kinetics. The results show that addition of HPN-68 can increase the crystallization peak temperature (Tp) of iPP greatly under the same cooling rate. Under non-isothermal conditions, the addition of HPN-68 changes the spherulite growth pattern of iPP. For virgin iPP, the growth pattern is mainly spontaneous nucleation followed by three-dimensional spherulite growth, while for iPP nucleated with HPN-68, the growth pattern is mainly heterogeneous nucleation followed by three-dimensional spherulite growth.

Synergistic effect of aryl heterocyclic aluminum phosphate and sodium laurate on non-isothermal crystallization kinetics of isotactic polypropylene

2015 ◽  
Vol 30 (5) ◽  
pp. 678-690 ◽  
Author(s):  
Yufei Liu ◽  
Kai Zhang ◽  
Guang Fu ◽  
Wentao He ◽  
Shuhao Qin ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Isothermal Crystallization ◽  
Mass Fraction ◽  
Activation Barrier ◽  
Crystallization Rate ◽  
Aluminum Phosphate ◽  
Nucleating Agent ◽  
Sodium Laurate ◽  
Initial Slope ◽  
Kinetics Of

Kinetics of non-isothermal crystallization of isotactic polypropylene (iPP)/nucleating agent blends was studied for the nucleation mechanism. Avrami, Jeziorny, and correctional Friedman methods were applied to analyze the non-isothermal crystallization of the iPP/aryl heterocylic aluminum phosphate/sodium laurate (iPP/AHP-Al/L-Na) blends. For a given cooling rate of 10°C min−1, the onset temperature ( To) and crystallization temperature ( Tc) of the iPP/AHP-Al/L-Na blends increased by 4.19°C and 3.57°C, respectively, compared to iPP/L-Na. The To and Tc of iPP/AHP-Al/L-Na blends increased by 2.13°C and 1.79°C, respectively, compared to iPP/AHP-Al, when the AHP-Al mass fraction reached 1.2‰. The effective activation barrier (Δ E) for non-isothermal crystallization was the least when the AHP-Al mass fraction was 0.8‰. The value of the initial slope of the exotherm increased with the addition of AHP-Al monotonically. All these findings indicated that AHP-Al could improve the initial crystallization rate and also that the addition of AHP-Al/L-Na reduced the Δ E for non-isothermal crystallization. It is speculated that an ion exchange reaction between AHP-Al and L-Na occurs during the mixing process and could be possible that this results in the generation of a more efficient nucleating agent.

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