PMID- 36969109
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230329
IS  - 0024-9297 (Print)
IS  - 1520-5835 (Electronic)
IS  - 0024-9297 (Linking)
VI  - 55
IP  - 24
DP  - 2022
TI  - Crystallization Kinetics in an Immiscible Polyolefin Blend.
LID - 10.1021/acs.macromol.2c01691 [doi]
AB  - Motivated by the problem of brittle mechanical behavior in recycled blends of 
      high density polyethylene (HDPE) and isotactic polypropylene (iPP), we employ 
      optical microscopy, rheo-Raman, and differential scanning calorimetry (DSC) to 
      measure the composition dependence of their crystallization kinetics. Raman 
      spectra are analyzed via multivariate curve resolution with alternating 
      least-squares (MCR-ALS) to provide component crystallization values. We find that 
      iPP crystallization behavior varies strongly with blend composition. Optical 
      microscopy shows that three crystallization kinetic regimes correspond to three 
      underlying two-phase morphologies: HDPE droplets in iPP, the inverse, and 
      cocontinuous structures. In the HDPE droplet regime, iPP crystallization 
      temperature decreases sharply with increasing HDPE composition. For cocontinuous 
      morphologies, iPP crystallization is delayed, but the onset temperature changes 
      little with the exact blend composition. In the iPP droplet regime, the two 
      components crystallize nearly concurrently. Rheological measurements are 
      consistent with these observations. DSC indicates that the enthalpy of 
      crystallization of the blends is less than the weighted values of the individual 
      components, providing a possible clue for the decreased iPP crystallization 
      temperatures.
FAU - Huang, Derek E
AU  - Huang DE
AUID- ORCID: 0000-0001-9166-4117
AD  - Materials Science and Engineering Division, National Institute of Standards and 
      Technology, Gaithersburg, Maryland 20899, United States.
FAU - Kotula, Anthony P
AU  - Kotula AP
AD  - Materials Science and Engineering Division, National Institute of Standards and 
      Technology, Gaithersburg, Maryland 20899, United States.
FAU - Snyder, Chad R
AU  - Snyder CR
AUID- ORCID: 0000-0002-2916-9809
AD  - Materials Science and Engineering Division, National Institute of Standards and 
      Technology, Gaithersburg, Maryland 20899, United States.
FAU - Migler, Kalman B
AU  - Migler KB
AUID- ORCID: 0000-0001-6538-3733
AD  - Materials Science and Engineering Division, National Institute of Standards and 
      Technology, Gaithersburg, Maryland 20899, United States.
LA  - eng
GR  - 9999-NIST/ImNIST/Intramural NIST DOC/United States
PT  - Journal Article
PL  - United States
TA  - Macromolecules
JT  - Macromolecules
JID - 0365316
PMC - PMC10037551
MID - NIHMS1877743
COIS- The authors declare no competing financial interest.
EDAT- 2022/01/01 00:00
MHDA- 2022/01/01 00:01
PMCR- 2023/03/24
CRDT- 2023/03/27 03:34
PHST- 2023/03/27 03:34 [entrez]
PHST- 2022/01/01 00:00 [pubmed]
PHST- 2022/01/01 00:01 [medline]
PHST- 2023/03/24 00:00 [pmc-release]
AID - 10.1021/acs.macromol.2c01691 [doi]
PST - ppublish
SO  - Macromolecules. 2022;55(24):10.1021/acs.macromol.2c01691. doi: 
      10.1021/acs.macromol.2c01691.