FOLLOWUS
a.State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
b.Lanzhou Petrochemical Corporation of PetroChina, Lanzhou 730060, China
jcfeng@fudan.edu.cn
Published:01 January 2025,
Published Online:21 October 2024,
Received:24 January 2024,
Revised:18 July 2024,
Accepted:2024-07-31
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Zhang, X. R.; Wang, F. S.; Wang, X.; Gao, Y.; Zhang, H. X.; Liu, Z. Q.; Feng, J. C. Comparative investigation of the migration behavior of two stearate acid scavengers from Ziegler-Natta polypropylene into water during autoclaving treatment. Chinese J. Polym. Sci. 2025, 43, 90–100
XIN-RAO ZHANG, FU-SHAN WANG, XIN WANG, et al. Comparative Investigation of the Migration Behavior of Two Stearate Acid Scavengers from Ziegler-Natta Polypropylene into Water during Autoclaving Treatment. [J]. Chinese journal of polymer science, 2025, 43(1): 90-100.
Zhang, X. R.; Wang, F. S.; Wang, X.; Gao, Y.; Zhang, H. X.; Liu, Z. Q.; Feng, J. C. Comparative investigation of the migration behavior of two stearate acid scavengers from Ziegler-Natta polypropylene into water during autoclaving treatment. Chinese J. Polym. Sci. 2025, 43, 90–100 DOI: 10.1007/s10118-024-3213-6.
XIN-RAO ZHANG, FU-SHAN WANG, XIN WANG, et al. Comparative Investigation of the Migration Behavior of Two Stearate Acid Scavengers from Ziegler-Natta Polypropylene into Water during Autoclaving Treatment. [J]. Chinese journal of polymer science, 2025, 43(1): 90-100. DOI: 10.1007/s10118-024-3213-6.
The migration of the two commonly used acid scavengers
calcium stearate and zinc stearate
from the plates of a Z-N polypropylene into water during autoclaving were comparatively investigated. It was found that these two acid scavengers exhibited significantly different migration behaviors.
Although Ziegler-Natta (Z-N) polyolefins have been widely used as raw materials to produce pharmaceutical or food packaging
the migration of acid scavengers
an additive usually introduced in Z-N polyolefins
from the packaging to its contents has not been reported. In this work
the migration of the two most used acid scavengers
calcium stearate (CaSt
2
) and zinc stearate (ZnSt
2
)
from a Z-N polypropylene random copolymer (PPR) into water during autoclaving at 121 °C were comparatively investigated. It was found that
for PPR plates containing 0.1 wt% CaSt
2
or ZnSt
2
(PPR-0.1CaSt
2
PPR-0.1ZnSt
2
respectively)
the concentration of migrated calcium ion into water increased with autoclaving time
while that of zinc ion was much lower at same treatment durations and did not show a significant increase with treatment time. Interestingly
after removing all plates and acidification treatment
a considerable amount of stearic acid was detected in sterilized water for PPR-0.1ZnSt
2
but no such significant stearic acid was detected in sterilized water for PPR-0.1CaSt
2
. Based on the structural evolution of the two soaps upon heating
possible mechanisms for the different migration behavior of CaSt
2
and ZnSt
2
from PPR into water during autoclaving treatment were proposed. Our results suggest that the migration issue of acid scavengers is worthy of attention in pharmaceutical packaging materials produced from Z-N polyolefins.
Zinc stearateCalcium stearateZiegler-Natta polyolefinAutoclaving treatmentMigration
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