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Abstract:
Mirel™ poly(hydroxy butanoic acid),
or PHB copolymers, and their products are known
to biodegrade in soil and compost sites and in
freshwater and seawater environments. Because
they biodegrade in soil, PHB copolymers are very
well suited for agricultural mulch film applications.
Vegetable-crop growth with PHB copolymer mulch
films in various environments has been shown to
be considerably better than bare-ground crop growth
and similar to crop growth with polyethylene mulch
films.
PHB copolymers readily disintegrate through microbial
action even at ambient temperatures. The subject
mulch films were ploughed into the soil after
crop harvest; the buried fragments of mulch film
were shown to completely biodegrade. Incineration
and landfill disposal are the most commonly used
means of disposing of polyethylene mulch films,
so natural biodegradation of ploughed-in film
is both an eco-friendly alternative and a considerably
more efficient farming practice. In addition,
MirelTM PHB copolymers are based largely on renewable
resources (corn sugar), unlike petroleum-based
polyethylene.
Presenter:
Rajendra K. Krishnaswamy, Metabolix, Inc.
Dr. Raj Krishnaswamy is a senior scientist
at Metabolix, Inc., where he is involved in developing
commercially viable formulations of biobased and
biodegradable polymers for film applications and
also leads many fundamental structure-property
research activities. In 2007, he was selected
to participate in the National Academy of Engineers
Frontiers Symposium. Prior to joining Metabolix
in 2006, Raj spent nine years in the polymer science
group at Chevron Phillips Chemical Company; during
this tenure there, he received the “Outstanding
Young Scientist” award and an “Innovation
Excellence” award. He is also a past recipient
of the SPE Husky Education award. Raj currently
serves on the editorial boards of Journal of
Plastic Film and Sheeting and the Encyclopedia
of Polymer Science and Technology; he is also
a board member on the SPE Bioplastics SIG and
the AIChE Materials Division.
Raj has co-authored
over 35 peer-reviewed journal papers and four
book chapters; he is also a co-inventor on some
25 patents (U.S. and elsewhere) and patent applications.
He has delivered invited lectures at various industries
and at many universities in North America, Europe,
and Asia.
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