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Crystallization kinetics of impact modified polypropylene

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Abstract

Non-isothermal crystallization kinetics of PP homopolymer (PPHP), PP copolymer (PPCP) and nucleated PP copolymer (PPCPN) were studied using differential scanning calorimetry (DSC) at different cooling rates. Various kinetic models, namely, Avrami equation modified by Jeziorny, Ozawa method and the method developed by Mo were employed to describe non-isothermal crystallization kinetics of the samples. The Ozawa analysis failed to provide an adequate description of the crystallization process; however, the method developed by Mo was successful in describing the non-isothermal crystallization of PP samples. Different kinetic parameters such as Avrami exponent n, kinetic crystallization rate constant k c, another kinetic parameter F(T), crystallization temperature T c, half life of crystallization t 1/2 etc. were determined at various cooling rates. The difference in the values of Avrami exponent n in PPCPN indicated a heterogeneous nucleation and tridimensional spherulitic growth, whereas both PPHP and PPCP showed different nucleation and growth trends. The values of t 1/2, k c and F(T) showed that in all samples crystallization rate increased with increase in cooling rate. Moreover, the crystallization rate of PPCPN was faster than that of other two samples at a given cooling rate. The activation energy for the transport of macromolecular segments to growing crystal surface was determined by using the Kissinger method. The lowest activation energy (ΔE) of PPCPN indicated a highest crystallization tendency than that of other two samples.

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Abbreviations

PPHP:

Polypropylene Homopolymer

PPCP:

Polypropylene Copolymer

PPCPN:

Polypropylene Copolymer with nucleating agent

T c :

peak crystallization temperature

Φ:

cooling rate

X t :

relative degree of crystallinity

t 1/2 :

halftime of crystallization

n :

Avrami exponent

k :

crystallization rate constant

k c :

kinetic crystallization rate constant

m :

Ozawa exponent

F(T):

kinetic parameter of Mo equation

a :

ratio of Avrami exponent to Ozawa exponent (n/m)

ΔE:

activation energy of crystal growth

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Authors and Affiliations

  1. Centre for Polymer Science & Engineering, Indian Institute of Technology, New Delhi, 110016, India

    Sangita Nandi & Anup K. Ghosh

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  1. Sangita Nandi
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  2. Anup K. Ghosh
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Correspondence to Anup K. Ghosh.

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Nandi, S., Ghosh, A.K. Crystallization kinetics of impact modified polypropylene. J Polym Res 14, 387–396 (2007). https://doi.org/10.1007/s10965-007-9121-y

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