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Different Influences of Two Peroxide Initiators on Structure and Properties of Poly(Lactic Acid)
Author(s) -
Jiang Wei,
Ge Xin,
Zhang Bangwen,
Xing Ruiguang,
Chang Mingming
Publication year - 2020
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.21760
Subject(s) - differential scanning calorimetry , materials science , ultimate tensile strength , glass transition , peroxide , compounding , thermogravimetric analysis , organic peroxide , gel permeation chromatography , fourier transform infrared spectroscopy , lactic acid , scanning electron microscope , dynamic mechanical analysis , polymer , polylactic acid , tensile testing , composite material , polymer chemistry , chemical engineering , copolymer , chemistry , organic chemistry , physics , genetics , biology , bacteria , engineering , thermodynamics
In the present work, poly(lactic acid) (PLA) was modified with two peroxide initiators: biphenyl peroxide (BPO) and dicumyl peroxide (DCP). The samples were all prepared with melt compounding method. Changes in the structure of PLA after the modification were analyzed with Fourier transformed infrared spectroscopy, gel penetration chromatography, and field emission scanning electron microscopy. Thermomechanical properties of the samples were determined with tensile test, dynamic mechanical analysis, and thermal gravimetric analysis/differential scanning calorimetry simultaneous thermal analyzer. Both BPO and DCP initiated free‐radical reactions at PLA polymer chains, which led to the formation of crosslinking structure. By this way, the tensile strength of PLA was elevated to about 50 MPa, which was much higher than the tensile strength of unmodified PLA (35.5 MPa). The glass‐transition temperature and melting temperature of the samples slightly decreased after modification. The different influences of BPO and DCP on PLA were mainly derived from their different chemical structures and activities.