Please use this identifier to cite or link to this item: https://ir.swu.ac.th/jspui/handle/123456789/12695
ชื่อเรื่อง: 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]
ผู้แต่ง: Petchwattana N.
Naknaen P.
Sanetuntikul J.
Keywords: 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
วันที่เผยแพร่: 2018
บทคัดย่อ: 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.
URI: https://ir.swu.ac.th/jspui/handle/123456789/12695
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85059699954&doi=10.1007%2fs11771-018-3977-3&partnerID=40&md5=75506ce64cb8ad3ce7b552898fb6cdd2
ISSN: 20952899
Appears in Collections:Scopus 1983-2021

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