Compatibility Enhancement of Poly(lactic Acid)/Crosslinked Starch Composite by Vacuum Heating Treatment

2011 ◽  
Vol 236-238 ◽  
pp. 207-215
Author(s):  
Xiao Gang Liu ◽  
Li Wang ◽  
Chen Yu Fan ◽  
Shi Zhong Li
Keyword(s):  
Lactic Acid ◽  
Solid Phase ◽  
Poly Lactic Acid ◽  
Elongation At Break ◽  
Heating Treatment ◽  
Two Phases ◽  
Vacuum Heating ◽  
The Cost ◽  
The Impact ◽  
Positive Effect

Compositing with starch is an effective way to lower the cost of the poly (lactic acid)(PLA)-based biodegradable materials, while the compatibility of these two phases needs to be enhanced. Here reports an improvement based on vacuum heating treatment(VHT), hence a solid-phase esterification between PLA and crosslinked starch（CST） is enhanced. This research also studied the impact by esterified catalysts and starch proportion on thermal stability, surface morphology and mechanical properties of the composite. The result indicated that VHT shows positive effect on all aspects. Especially, sample with 20% CST shows optimized tensile strength of 62.6 MPa, and elongation at break was as high as 69.8%.

scholarly journals Investigation on compatibility of PLA/PBAT blends modified by epoxy-terminated branched polymers through chemical micro-crosslinking

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 39-54 ◽  
Author(s):  
Bo Wang ◽  
Yujuan Jin ◽  
Kai’er Kang ◽  
Nan Yang ◽  
Yunxuan Weng ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Glass Transition ◽  
Sem Analysis ◽  
Branched Polymers ◽  
Poly Lactic Acid ◽  
Elongation At Break ◽  
Butylene Terephthalate ◽  
The Difference ◽  
Physical And Chemical ◽  
The Impact

AbstractIn this study, a type of epoxy-terminated branched polymer (ETBP) was used as an interface compati- bilizer to modify the poly lactic acid (PLA)/poly(butylene adipate-co-butylene terephthalate) (PBAT) (70/30) blends. Upon addition of ETBP, the difference in glass transition temperature between PLA and PBAT became smaller. By adding 3.0 phr of ETBP, the elongation at break of the PLA/PBAT blends was found increased from 45.8% to 272.0%; the impact strength increased from 26.2 kJ·m−2 to 45.3 kJ·m−2. In SEM analysis, it was observed that the size of the dispersed PBAT particle decreased with the increasing of ETBP content. These results indicated that the compatibility between PLA and PBAT can be effectively enhanced by using ETBP as the modifier. The modification mechanism was discussed in detail. It proposes that both physical and chemical micro-crosslinking were formed, the latter of which was confirmed by gel content analysis.

scholarly journals A study on the mechanical, thermal properties and crystallization behavior of poly(lactic acid)/thermoplastic poly(propylene carbonate) polyurethane blends

RSC Advances ◽  
2017 ◽  
Vol 7 (73) ◽  
pp. 46183-46194 ◽  
Author(s):  
Jia Yang ◽  
Hongwei Pan ◽  
Xin Li ◽  
Shulin Sun ◽  
Huiliang Zhang ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Impact Strength ◽  
Propylene Carbonate ◽  
Crystallization Behavior ◽  
Raw Materials ◽  
Poly Lactic Acid ◽  
Elongation At Break ◽  
Poly Propylene ◽  
The Impact

PPCU was prepared by using PPC and polyols as the raw materials and diphenyl-methane-diisocyanate (MDI) as the extender chain. The impact strength and elongation at break of PLA were remarkably enhanced by blending with PPCU.

scholarly journals Thermal, Mechanical, and Rheological Properties of Biocomposites Made of Poly(lactic acid) and Potato Pulp Powder

2019 ◽  
Vol 20 (3) ◽  
pp. 675 ◽  
Author(s):  
Maria Righetti ◽  
Patrizia Cinelli ◽  
Norma Mallegni ◽  
Carlo Massa ◽  
Simona Bronco ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Rheological Properties ◽  
Circular Economy ◽  
Poly Lactic Acid ◽  
Waste Biomass ◽  
Progressive Decrease ◽  
Elongation At Break ◽  
Potato Pulp ◽  
Technical Requirements ◽  
The Cost

The thermal, mechanical, and rheological properties of biocomposites of poly(lactic acid) (PLA) with potato pulp powder were investigated in order to (1) quantify how the addition of this filler modifies the structure of the polymeric material and (2) to obtain information on the possible miscibility and compatibility between PLA and the potato pulp. The potato pulp powder utilized is a residue of the processing for the production and extraction of starch. The study was conducted by analyzing the effect of the potato pulp concentration on the thermal, mechanical, and rheological properties of the biocomposites. The results showed that the potato pulp powder does not act as reinforcement but as filler for the PLA polymeric matrix. A progressive decrease in elastic modulus, tensile strength, and elongation at break was observed with increasing the potato pulp percentage. This moderate loss of mechanical properties, however, still meets the technical requirements indicated for the production of rigid packaging items. The incorporation of potato pulp powder to PLA offers the possibility to reduce the cost of the final products and promotes a circular economy approach for the valorization of agro-food waste biomass.

Reactive compatibilization of poly(lactic acid)/polyethylene octene copolymer blends with ethylene-glycidyl methacrylate copolymer

2011 ◽  
Vol 31 (6-7) ◽  
Author(s):  
Fang-Cheng Pai ◽  
Hou-Hsein Chu ◽  
Sun-Mou Lai
Keyword(s):  
Lactic Acid ◽  
Impact Strength ◽  
Glycidyl Methacrylate ◽  
Chemical Interaction ◽  
Poly Lactic Acid ◽  
Elongation At Break ◽  
Reactive Compatibilization ◽  
Interfacial Compatibility ◽  
Methacrylate Copolymer ◽  
The Impact

Abstract A melt blending process was used to prepare poly(lactic acid) (PLA)/metallocene catalyzed polyethylene octene copolymer (POE) blends in order to toughen PLA. A commercialized ethylene-glycidyl methacrylate copolymer (EGMA) was applied as a compatibilizer to improve the dispersion and interaction of dispersed POE to the PLA matrix. The results showed that chemical interaction seems to be the driving force for reinforcing the compatibility between PLA and POE, and also the dispersion of POE into the PLA matrix domain. With the incorporation of 10 phr EGMA in the blends, POE was well-dispersed at a sub-micrometer scale within the PLA matrix, indicating better interfacial compatibility between PLA and POE. The impact strength test revealed that POE could significantly toughen PLA containing EGMA in the blends, up to no-break level regarding unnotched Izod impact strength at 10 phr EGMA content. With the increase of EGMA content, the blends showed lower tensile strength, but higher elongation at break due to the elastomeric characteristics of EGMA. When 10 phr of the EGMA was incorporated into the blends, its elongation at break reached 54.5%, 10.7 times that of neat PLA at 5.1%. The melt viscosity of compatibilized blends containing 10 phr EGMA increased by more than 50% in comparison with the non-compatibilized blend, which implied a good interfacial interaction between the PLA and POE interface.

A Case Study of Recycled Poly(Lactic Acid) Contaminated with Petroleum-Based Thermoplastics Used in Packaging Application

2019 ◽  
Vol 798 ◽  
pp. 279-284
Author(s):  
Pajaera Patanathabutr ◽  
Patiphan Soysang ◽  
Pakjira Leuang-On ◽  
Piyapon Kasetsupsin ◽  
Nattakarn Hongsriphan
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Impact Strength ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Elongation At Break ◽  
The Impact ◽  
Multiple Processing

This study was designed to evaluate properties of poly(lactic acid) (PLA) under the postulation that recycled PLA (rPLA) was contaminated with commodity thermoplastics during a typical density-based sorting. Change in clarity, mechanical, and thermal properties of the contaminated rPLA specimens were compared. Clarity of rPLA was reduced showing pale brownish tint when passing multiple processing. Contamination with either PP or HIPS just 1 phr caused rPLA to become opaque, which the transmittance percentage was decreased with respect to contamination content. Compared to pure PLA, the moduli of rPLA was reduced 2.6%. The moduli of rPLA was reduced 4.5-8.2% when contaminated with PP of 1-8 phr, and the moduli was reduced 1.4-4.1% when contaminated with HIPS of 1-8 phr. Elongation at break of PP-contaminated rPLA specimens was reduced with slight increase of impact strength. Elongation at break of HIPS-contaminated rPLA specimens was higher with higher HIPS content, and the impact strength was enhanced up to 64%.

Mechanical and Thermal Behaviors of the Acrylic Based Core-Shell Rubber Modified Poly(Lactic Acid)

2011 ◽  
Vol 306-307 ◽  
pp. 340-343 ◽  
Author(s):  
Nawadon Petchwattana ◽  
Sirijutaratana Covavisaruch ◽  
Nukul Euapanthasate
Keyword(s):  
Lactic Acid ◽  
Tensile Modulus ◽  
Degree Of Crystallinity ◽  
Poly Lactic Acid ◽  
Core Shell ◽  
Twin Screw Extrusion ◽  
Elongation At Break ◽  
Screw Extrusion ◽  
Twin Screw ◽  
The Impact

Toughening of poly(lactic acid) (PLA) biopolymer by particles of acrylic based core-shell rubber (CSR) was conducted to observe the influences of the rubber contents on the properties of the modified PLA. A series of PLA specimens modified with the CSR by 0.1-10 wt% was prepared by twin screw extrusion and injection. Diminishing brittleness was reflected in the dramatic increment of both the impact strength by threefolds and the elongation at break by fifteenfolds when CSR was employed by 10 wt%. The toughening was also accompanied with a decrease in the tensile modulus and strength. At low loading, the added CSR by 0.5wt% also assisted crystallization of the PLA by slightly lowering the crystallization temperature, allowing decreased processing time and improving the degree of crystallinity of the generally difficult to crystallize PLA.

scholarly journals Effect of talc and diatomite on compatible, morphological, and mechanical behavior of PLA/PBAT blends

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 234-243
Author(s):  
Yue Ding ◽  
Cai Zhang ◽  
Congcong Luo ◽  
Ying Chen ◽  
Yingmei Zhou ◽  
...  
Keyword(s):  
Poly Lactic Acid ◽  
Melt Blending ◽  
Rheological Measurement ◽  
Elongation At Break ◽  
Biodegradable Poly ◽  
Green Packaging ◽  
Biodegradable Nanocomposites ◽  
Two Phases ◽  
The Impact ◽  
Good Possibility

Abstract Biodegradable nanocomposites were prepared by melt blending biodegradable poly(lactic acid) (PLA) and poly(butylene adipate-co-butylene terephthalate) (PBAT) (70/30, w/w) with diatomite or talc (1–7%). From the SEM test, the particles were transported to the interface of two phases, which acted as an interface modifier to strengthen the interfacial adhesion between PLA and PBAT. Talc and diatomite acted as nucleating agents to improve the crystallization of PBAT in the blends by DSC analysis. Moreover, adding the particles improved the tensile and impact toughness of the blends. The elongation at break with 5% talc was 78% (vs ∼21%) and the impact strength was 15 kJ/m2 (vs ∼6.5 kJ/m2). The rheological measurement revealed that the talc and diatomite reduced the viscosity of the blends. The results showed a good possibility of using talc- and diatomite-filled PLA/PBAT blends with high toughness for green-packaging and bio-membranes application.

scholarly journals Poly(Lactic Acid)–Poly(Butylene Succinate)–Sugar Beet Pulp Composites; Part I: Mechanics of Composites with Fine and Coarse Sugar Beet Pulp Particles

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2531
Author(s):  
Rodion Kopitzky
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Sugar Beet ◽  
Cell Structure ◽  
Sugar Beet Pulp ◽  
Poly Lactic Acid ◽  
Butylene Succinate ◽  
Fracture Patterns ◽  
Beet Pulp ◽  
The Impact

Sugar beet pulp (SBP) is a residue available in large quantities from the sugar industry, and can serve as a cost-effective bio-based and biodegradable filler for fully bio-based compounds based on bio-based polyesters. The heterogeneous cell structure of sugar beet suggests that the processing of SBP can affect the properties of the composite. An “Ultra-Rotor” type air turbulence mill was used to produce SBP particles of different sizes. These particles were processed in a twin-screw extruder with poly(lactic acid) (PLA) and poly(butylene succinate) (PBS) and fillers to granules for possible marketable formulations. Different screw designs, compatibilizers and the use of glycerol as a thermoplasticization agent for SBP were also tested. The spherical, cubic, or ellipsoidal-like shaped particles of SBP are not suitable for usage as a fiber-like reinforcement. In addition, the fineness of ground SBP affects the mechanical properties because (i) a high proportion of polar surfaces leads to poor compatibility, and (ii) due to the inner structure of the particulate matter, the strength of the composite is limited to the cohesive strength of compressed sugar-cell compartments of the SBP. The compatibilization of the polymer–matrix–particle interface can be achieved by using compatibilizers of different types. Scanning electron microscopy (SEM) fracture patterns show that the compatibilization can lead to both well-bonded particles and cohesive fracture patterns in the matrix. Nevertheless, the mechanical properties are limited by the impact and elongation behavior. Therefore, the applications of SBP-based composites must be well considered.

Mechanical, Thermal, and Morphological Properties of Thermoplastic Starch/Poly(lactic acid/Poly(butylene adipate-co-terephthalate) Blends

2014 ◽  
Vol 970 ◽  
pp. 312-316
Author(s):  
Sujaree Tachaphiboonsap ◽  
Kasama Jarukumjorn
Keyword(s):  
Lactic Acid ◽  
Impact Strength ◽  
Interfacial Adhesion ◽  
Tensile Modulus ◽  
Thermoplastic Starch ◽  
Morphological Properties ◽  
Poly Lactic Acid ◽  
Melt Blending ◽  
Elongation At Break ◽  
Blending Method

Thermoplastic starch (TPS)/poly (lactic acid) (PLA) blend and thermoplastic starch (TPS)/poly (lactic acid) (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) blend were prepared by melt blending method. PLA grafted with maleic anhydride (PLA-g-MA) was used as a compatibilizer to improve the compatibility of the blends. As TPS was incorporated into PLA, elongation at break was increased while tensile strength, tensile modulus, and impact strength were decreased. Tensile properties and impact properties of TPS/PLA blend were improved with adding PLA-g-MA indicating the enhancement of interfacial adhesion between PLA and TPS. With increasing PBAT content, elongation at break and impact strength of TPS/PLA blends were improved. The addition of TPS decreased glass transition temperature (Tg), crystallization temperature (Tc), and melting temperature (Tm) of PLA. Tgand Tcof TPS/PLA blend were decreased by incorporating PLA-g-MA. However, the presence of PBAT reduced Tcof TPS/PLA blend. Thermal properties of TPS/PLA/PBAT blends did not change with increasing PBAT content. SEM micrographs revealed that the compatibilized TPS/PLA blends exhibited finer morphology when compared to the uncompatibilized TPS/PLA blend.

Sign in / Sign up

Export Citation Format

Share Document