Blends of poly(lactic acid) and modified starch

    Research output: ResearchConference contribution

    Abstract

    Poly(lactic acid), PLA, has received many attentions as an alternative polymer to the petroleum-based ones due to its mechanical properties which are comparable to those of PET and PS, to be glossy, and its biodegradability. Starch, another polymer derived from renewable agricultural feedstock, has used as filler to have both biodegradability and lower cost for environmentally friendly plastics. Many efforts have been done to develop a biodegradable polymer by blending PLA and typical starch because of the immiscibility of those two-phase polymers. Cyclodextrins (CDs), an enzymatically modified starch, have successfully been used for encapsulation of different compounds from cavities as host molecules. CDs are mainly used to enhance the delivery of specific components such as drugs and flavors at the pharmaceutical and food industries controlled by temperature and relative humidity. This study is to have better dispersed blends of PLA and modified starch. Pilot-scale extruder was used to blend poly(lactic acid) and CDs with different ratios (1:0.4, 1:0.2). By using the sample (1:0.4) and PLA, master batch was made to have same concentration of the sample (1:0.2). All samples were palletized and those pallets were developed as films by using casting film extruder. Mechanical properties and thermal properties were measured to analyze the blends and the results showed that one only melting point presented which means well-blended to put together each melting point. Scanning electron microscopy was used to visualize different dispersions of CDs to the polymer matrix.

    LanguageEnglish (US)
    Title of host publicationSociety of Plastics Engineers - Global Plastics Environmental Conference 2010, GPEC 2010
    StatePublished - 2010
    EventSociety of Plastics Engineers - Global Plastics Environmental Conference 2010 - Sustainability and Recycling: Raising the Bar in Today's Economy, GPEC 2010 - Orlando, FL, United States
    Duration: Mar 8 2010Mar 10 2010

    Other

    OtherSociety of Plastics Engineers - Global Plastics Environmental Conference 2010 - Sustainability and Recycling: Raising the Bar in Today's Economy, GPEC 2010
    CountryUnited States
    CityOrlando, FL
    Period3/8/103/10/10

    Profile

    Cyclodextrins
    Starch
    poly(lactic acid)
    Lactic acid
    Polymers
    Biodegradability
    Extruders
    Melting point
    Mechanical properties
    Pharmaceutical Preparations
    Biodegradable polymers
    Pallets
    Flavors
    Petroleum
    Polymer matrix
    Dispersions
    Encapsulation
    Feedstocks
    Fillers
    Atmospheric humidity

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Environmental Engineering

    Cite this

    Joo, M. J., Narayan, R., Auras, R., & Almenar, E. (2010). Blends of poly(lactic acid) and modified starch. In Society of Plastics Engineers - Global Plastics Environmental Conference 2010, GPEC 2010

    Blends of poly(lactic acid) and modified starch. / Joo, M. J.; Narayan, R.; Auras, R.; Almenar, E.

    Society of Plastics Engineers - Global Plastics Environmental Conference 2010, GPEC 2010. 2010.

    Research output: ResearchConference contribution

    Joo, MJ, Narayan, R, Auras, R & Almenar, E 2010, Blends of poly(lactic acid) and modified starch. in Society of Plastics Engineers - Global Plastics Environmental Conference 2010, GPEC 2010. Society of Plastics Engineers - Global Plastics Environmental Conference 2010 - Sustainability and Recycling: Raising the Bar in Today's Economy, GPEC 2010, Orlando, FL, United States, 3/8/10.
    Joo MJ, Narayan R, Auras R, Almenar E. Blends of poly(lactic acid) and modified starch. In Society of Plastics Engineers - Global Plastics Environmental Conference 2010, GPEC 2010. 2010.
    Joo, M. J. ; Narayan, R. ; Auras, R. ; Almenar, E./ Blends of poly(lactic acid) and modified starch. Society of Plastics Engineers - Global Plastics Environmental Conference 2010, GPEC 2010. 2010.
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    AB - Poly(lactic acid), PLA, has received many attentions as an alternative polymer to the petroleum-based ones due to its mechanical properties which are comparable to those of PET and PS, to be glossy, and its biodegradability. Starch, another polymer derived from renewable agricultural feedstock, has used as filler to have both biodegradability and lower cost for environmentally friendly plastics. Many efforts have been done to develop a biodegradable polymer by blending PLA and typical starch because of the immiscibility of those two-phase polymers. Cyclodextrins (CDs), an enzymatically modified starch, have successfully been used for encapsulation of different compounds from cavities as host molecules. CDs are mainly used to enhance the delivery of specific components such as drugs and flavors at the pharmaceutical and food industries controlled by temperature and relative humidity. This study is to have better dispersed blends of PLA and modified starch. Pilot-scale extruder was used to blend poly(lactic acid) and CDs with different ratios (1:0.4, 1:0.2). By using the sample (1:0.4) and PLA, master batch was made to have same concentration of the sample (1:0.2). All samples were palletized and those pallets were developed as films by using casting film extruder. Mechanical properties and thermal properties were measured to analyze the blends and the results showed that one only melting point presented which means well-blended to put together each melting point. Scanning electron microscopy was used to visualize different dispersions of CDs to the polymer matrix.

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