Hexane, 1,6-diisocyanato-, homopolymer, 2-hydroxyethyl acrylate- and propylene glycol monoacrylate-blocked

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

GLP compliance:

not specified

Type of method:

differential scanning calorimetry

Key result

Remarks on result:

other: The test substance showed no freezing point but a glass transition at -32°C

DSC results (2 heating runs):

Sample	Tg (HR1)	Tg (HR2)
	°C	°C
test substance	-32	-32

Conclusions:

Under the study conditions, the substance showed no freezing point but a glass transition at -32°C.

Executive summary:

A study was conducted to determine the melting/freezing point of the substance according to OECD Guideline 102 and EU Method A.1. Since the resins are liquid at room temperature , the glass transition/freezing was determined at sub-ambient temperatures using conventional differential scanning calorimetry (DSC). A sample of ≈ 10 mg was loaded in a standard aluminum crucible (40 µL) fitted with a pierced lid. The measurements were conducted at a linear heating rate of 10°C min-1 using commercial DSC equipment (Mettler DSC823e or Q10 from TA Instruments). The DSC cell was flushed with nitrogen gas at a flow rate of 50 mL min-1. Under the study conditions, the substance showed no freezing point but a glass transition at -32°C (Leclercq, 2015).

Description of key information

The freezing point was determined according to OECD Guideline 102 and EU Method A.1 (Leclercq, 2015).

Additional information

No freezing point but a glass transition was observed at -32°C.