Silane modified starch for compatible reactive blend with poly(lactic acid).
A reactive blend of poly(lactic acid) (PLA) and a surface modified starch by silane coupling agent to achieve compatibility is proposed. A detailed structural analysis by using (1)H-(1)H TOCSY NMR spectrum clarifies, for the first time, that chloropropyl trimethoxysilane (CPMS) forms covalent bonds with starch during starch modification and consequently forms covalent bonds with PLA in the step of blending to produce a reactive blend of PLA and CP-starch. The CP-starch covalently bound with PLA provides the compatibility between PLA and starch and also plays the role as nucleating agent as identified from a significant increase of degree of crystallinity (as high as 10-15 times), as well as induces chain mobility, as identified from a slight decrease in glass transition temperature (∼5-10°C). The PLA/CP-starch film performed as well as neat PLA with slight increases in tensile strength and elongation at break, as compared to other PLA/silane modified starch films.
The Petroleum and Petrochemical College, Chulalongkorn University, Soi Chula 12, Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
Piyawanee
P
Jariyasakoolroj
The Petroleum and Petrochemical College, Chulalongkorn University, Soi Chula 12, Phayathai Road, Pathumwan, Bangkok 10330, Thailand; Center for Petroleum, Petrochemical, and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand. Electronic address: csuwabun@chula.ac.th.
Suwabun
S
Chirachanchai
D003460:Crystallization; D006358:Hot Temperature; D019344:Lactic Acid / Q000378:metabolism*; D008422:Materials Testing; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D019906:Nuclear Magnetic Resonance, Biomolecular; D011091:Polyesters; D011108:Polymers / Q000378:metabolism*; D012821:Silanes / Q000494:pharmacology*; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry / Q000378:metabolism*; D013718:Tensile Strength
D011091:Polyesters; D011108:Polymers; D012821:Silanes; D019344:Lactic Acid; C033616:poly(lactide); D013213:Starch; C071717:trimethoxysilane
Compatibility; Poly(lactic acid); Reactive blend; Silane coupling agent; Starch