2011
DOI: 10.1002/app.33750
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Preparation and characterization of high‐molecular‐weight poly(l‐lactic acid) by chain‐extending reaction with phosphites

Abstract: Poly(L-lactic acid) (PLLA) of high molecular weight was prepared by a chain-extending reaction in a microcompounder. Phosphites were used as chain extenders to increase the molecular weight of the PLLA prepolymer, which was prepared by the bulk polycondensation of l-lactic acid. The effects of the amount of phosphite, the temperature, and the screw speed on the torque of the PLLA melt were studied. Under the optimal conditions, the molecular weight of PLLA increased from 62,100 to 126,000 g/mol. The chemical s… Show more

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Cited by 9 publications
(8 citation statements)
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“…PLLA does not exhibit pyroelectricity because it does not have an intrinsic polarization. [16][17][18][19][20][21][22] PVDF is a polymer that belongs to the ferroelectric group, and exhibits pyroelectricity because it has an intrinsic polarization. Figure 2 shows the time dependence of the amount of electric charge generated in PLLA and PVDF films due to heat.…”
Section: Pyroelectricity Of the Piezoelectric Filmmentioning
confidence: 99%
“…PLLA does not exhibit pyroelectricity because it does not have an intrinsic polarization. [16][17][18][19][20][21][22] PVDF is a polymer that belongs to the ferroelectric group, and exhibits pyroelectricity because it has an intrinsic polarization. Figure 2 shows the time dependence of the amount of electric charge generated in PLLA and PVDF films due to heat.…”
Section: Pyroelectricity Of the Piezoelectric Filmmentioning
confidence: 99%
“…1, the space group of the PLLA crystal is P2 1 2 1 2 1 , and the crystal has no pyroelectricity because of its symmetry. [15][16][17][18][19][20] On the other hand, PLLA has excellent transparency compared with PVDF. It is expected to be a key material for realizing pressure sensors with high sensitivity required for pressure sensor applications such as touch panels.…”
Section: Introductionmentioning
confidence: 99%
“…Figure a shows the X‐ray diffraction patterns of PLLA electrospun fibers. A sharp peak at 2 θ of 16.9°, characteristic of semicrystalline PLLA, was observed . The broad diffraction peak at 20.1° in Figure b shows the characteristic peak of PVP .…”
Section: Resultsmentioning
confidence: 89%
“…A sharp peak at 2θ of 16.9 , characteristic of semicrystalline PLLA, was observed. [33] The broad diffraction peak at 20.1 in Figure 4b shows the characteristic peak of PVP. [34] Figure 4c shows the XRD patterns of PLLA-PVP blended electrospun fibers, showing the conversion of semicrystalline PLLA to the amorphous form in the blend.…”
Section: Thermal Study Of Electrospun Fibersmentioning
confidence: 99%