PMID- 15491880
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20041220
LR  - 20041019
IS  - 1350-4177 (Print)
IS  - 1350-4177 (Linking)
VI  - 12
IP  - 3
DP  - 2005 Feb
TI  - Mechanochemical degradation kinetics of high-density polyethylene melt and its 
      mechanism in the presence of ultrasonic irradiation.
PG  - 183-9
AB  - In this paper, the effect of ultrasonic intensity on the degradation of 
      high-density polyethylene (HDPE) melt, degradation mechanism, ultrasonic 
      degradation kinetics of HDPE melt as well as the development of molecular weight 
      distribution of HDPE melt during ultrasonic degradation were studied. In the 
      initial stage, the ultrasonic degradation of HDPE melt shows a random scission 
      process, and the molecular weight distribution broadens. After that, the 
      ultrasonic degradation of HDPE melt shows a nonrandom scission process, and the 
      molecular weight distribution of HDPE melt narrows with ultrasonic irradiation 
      time. The average molecular weight of HDPE decreases with the increase of 
      ultrasonic intensity and increases and trends forward that of undegraded HDPE 
      with the increase of distance from ultrasonic probe tip, indicating that 
      attenuation of ultrasonic intensity in HDPE melt is very quick. Ultrasonic 
      degradation kinetics of HDPE melt obeys the equation: Mt=M(infinity) + Ae(-kt). 
      The theoretic calculation by this equation accords well with the experimental 
      results. The plausible ultrasonic degradation mechanism of polymer melt based on 
      molecular relaxation was also proposed in this paper.
FAU - Li, Yuntao
AU  - Li Y
AD  - The State Key Laboratory of Polymer Materials Engineering, Polymer Research 
      Institute of Sichuan University, Chengdu 610065, China.
FAU - Li, Jiang
AU  - Li J
FAU - Guo, Shaoyun
AU  - Guo S
FAU - Li, Huilin
AU  - Li H
LA  - eng
PT  - Journal Article
PL  - Netherlands
TA  - Ultrason Sonochem
JT  - Ultrasonics sonochemistry
JID - 9433356
EDAT- 2004/10/20 09:00
MHDA- 2004/10/20 09:01
CRDT- 2004/10/20 09:00
PHST- 2003/07/07 00:00 [received]
PHST- 2003/10/22 00:00 [accepted]
PHST- 2004/10/20 09:00 [pubmed]
PHST- 2004/10/20 09:01 [medline]
PHST- 2004/10/20 09:00 [entrez]
AID - S1350417703002074 [pii]
AID - 10.1016/j.ultsonch.2003.10.011 [doi]
PST - ppublish
SO  - Ultrason Sonochem. 2005 Feb;12(3):183-9. doi: 10.1016/j.ultsonch.2003.10.011.