The melting behavior of poly(phenylene sulphide) [35],
poly(ethylene terephthalate) (PET) [36], poly(butylene
terephthalate) [37], and poly(butylene succinate) [38]
usually display triple melting peaks when scanned in a
DSC. The lower and middle melting peaks were attributed
to the secondary and primary crystals, respectively, formed
at the crystallization temperature. The upper melting
peak was associated with the crystals reorganized during
the DSC scan. Temperature modulated DSC (TMDSC) is a
relatively new thermal analysis instrument. It provides the
information of the total heat flow, as the conventional DSC
does, and the reversible signal of the heat flow derived from
the heat capacity-related component. The non-reversing
heat flow is obtained from the difference between the total
and the reversing heat flow. The additional reversing and
non-reversing signals can characterize the melting and
recrystallization processes. Some laboratories also used
quasi-isothermal temperature MDSC to study the reversing
and non-reversing phenomena for crystallization and
melting of polymers [39–42].
The melting behavior of poly(phenylene sulphide) [35],poly(ethylene terephthalate) (PET) [36], poly(butyleneterephthalate) [37], and poly(butylene succinate) [38]usually display triple melting peaks when scanned in aDSC. The lower and middle melting peaks were attributedto the secondary and primary crystals, respectively, formedat the crystallization temperature. The upper meltingpeak was associated with the crystals reorganized duringthe DSC scan. Temperature modulated DSC (TMDSC) is arelatively new thermal analysis instrument. It provides theinformation of the total heat flow, as the conventional DSCdoes, and the reversible signal of the heat flow derived fromthe heat capacity-related component. The non-reversingheat flow is obtained from the difference between the totaland the reversing heat flow. The additional reversing andnon-reversing signals can characterize the melting andrecrystallization processes. Some laboratories also usedquasi-isothermal temperature MDSC to study the reversingand non-reversing phenomena for crystallization andmelting of polymers [39–42].
การแปล กรุณารอสักครู่..