Biodegradable polyester blend compositions and method of making same
A technology of composition and mixture, which is applied in the field of aliphatic polyester blend composition, and can solve problems such as impermeability
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Embodiment 1
[0203] This example demonstrates the preparation of a blend comprising a poly(hydroxyalkanoate) branched polymer mixed with one or several ester polycondensates to form a blend composition of the present invention . Such blends have been successfully prepared following several alternative routes. They can be obtained by blending two or more of the above polymers in a solution of a common solvent such as chloroform, followed by precipitation of the blend in a non-solvent. From a practical point of view, the solution blending approach is only attractive if solvents are required to extract the polyhydroxyalkanoate copolymer from its biological growth medium. Such blends can be prepared in a Banbury type internal mixer which is an ideal mixer for preparing small batches of material and for performance characterization and evaluation of properties. Larger quantities of blends are typically prepared in-plant using a Haake twin-screw extruder. It is possible to control the mixing ...
Embodiment 2
[0211] This example illustrates the significant increase in toughness observed in blends of PHA copolymers with ester polycondensates. Stiffness-toughness data were determined for compression molded films using a single notch size characterization method. The method involves applying a load to a wide sample containing a cut in its center, which represents the location of the initiation of the fracture and represents the continuation of the tear through the bond of the sample when a tensile load is applied to the sample. The initial slope of the curve provides a measure of the stiffness or rigidity of the bond, which can also in turn measure its flexibility. It is defined by the modulus of elasticity, which basically describes how a polymer begins to deform in the linear range of the load-displacement curve (Hooke's law) when a load is applied. It also often provides information on reasonable loads, ie loads that a material can withstand before undergoing significant (plastic)...
Embodiment 3
[0217]This example is another example showing the very marked increase in toughness observed in blends of PHA copolymers and ester polycondensates. Using a multi-sample method known in the burst testing art as the "Essential Work Method," fracture toughness data was obtained for numerous extruded / cast film samples comprising a variety of notch sizes. This test is more precise than the previous test and requires test samples with different initial incision lengths. This method is known and used by those skilled in the field of thin film rupture and is valuable because it provides a two-parameter characterization of the resistance of thin film materials to rupture. Additionally, the table below can be used to compare the relative performance of various thin film materials. In this case, a commercially available high-performance garbage bag made of polyethylene (Glad Quick-Tie, 0.74 mil thickness) was tested in the machine direction (MD) and in the cross-sectional direction (CD)...
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