Publication: Transformation of β to α phase of isotactic polypropylene nucleated with nano styrene butadiene rubber-based β-nucleating agent under microwave irradiation [微波辐照条件下基于纳米丁苯橡胶β 相形核剂的全同立构聚丙烯的β–α 相转变]
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Issued Date
2018
Resource Type
File Type
application/pdf
ISSN
20952899
Other identifier(s)
2-s2.0-85059699954
Rights Holder(s)
Scopus
Bibliographic Citation
Journal of Central South University. Vol 25, No.12 (2018), p.3098-3106
Suggested Citation
Petchwattana N., Naknaen P., Sanetuntikul J. Transformation of β to α phase of isotactic polypropylene nucleated with nano styrene butadiene rubber-based β-nucleating agent under microwave irradiation [微波辐照条件下基于纳米丁苯橡胶β 相形核剂的全同立构聚丙烯的β–α 相转变]. Journal of Central South University. Vol 25, No.12 (2018), p.3098-3106. doi:10.1007/s11771-018-3977-3 Retrieved from: https://hdl.handle.net/20.500.14740/5758
Author(s)
Abstract
This paper investigates the effect of microwave irradiation on the β to α phase transformation of the β-nucleated isotactic polypropylene (iPP). Ten microwave irradiation cycles was applied to the iPP and iPP modified with 0.3 wt% and 0.5 wt% β-NA, and the data at 2nd, 4th, 6th, 8th and 10th irradiation were reported. As expected, the sample temperature was found to increase with the irradiation time, by more than 130 °C, due to high frequency of microwave processing. This was the major factor that induced the β-phase transformation and structural change. Both the differential scanning calorimetry (DSC) and X-ray diffraction (XRD) results indicated that β-phase was mainly transformed to α-phase and partially converted to the amorphous section. It was reflected as 1) the reduction of the enthalpy of β-crystal melting (ΔH mβ ), 2) the increased enthalpy of α-crystal melting (ΔH mα ), 3) the decreased β-crystalline phase fraction (K β ) and 4) the decrease of the overall degree of crystallinity (X all ). Under impact force, neat iPP showed a slight increase in the impact strength with the irradiation time, due to the increase of amorphous region. For the β-iPP, it decreased due to the reduction of the β-phase content. © 2018, Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature.
Subject(s)
Crystallization
Differential scanning calorimetry
Enthalpy
Impact strength
Irradiation
Mechanical properties
Melting
Microwave irradiation
Radiation
Styrene
Thermodynamic properties
Amorphous regions
Crystalline phase
Degree of crystallinity
Isotactic poly(propylene) (iPP)
Isotactic polypropylene
Microwave processing
Sample temperature
Styrene butadiene rubber
Polypropylenes
Differential scanning calorimetry
Enthalpy
Impact strength
Irradiation
Mechanical properties
Melting
Microwave irradiation
Radiation
Styrene
Thermodynamic properties
Amorphous regions
Crystalline phase
Degree of crystallinity
Isotactic poly(propylene) (iPP)
Isotactic polypropylene
Microwave processing
Sample temperature
Styrene butadiene rubber
Polypropylenes