2010
DOI: 10.3390/polym2020071 View full text |Buy / Rent full text
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Abstract: A series of segmented multiblock copolymers containing aramid hard segments and extended polycaprolactone soft segments (with an M n of 4,200 or 8,200 g mol -1 ) was prepared and tested for their shape-memory properties. Chain extenders were essential to raise the hard segment concentration so that an extended rubbery plateau could be observed. Dynamic mechanical thermal analysis provided a useful guide in identifying (i) the presence of a rubbery plateau, (ii) the flow temperature, and (iii) the temperature w… Show more

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“…The phenomenon is attributed to the addition of the more rigid molecular segments of the PBA-a in the NGDE/PBA-a shape memory samples. Moreover, to obtain the optimum performance for a shape-memory polymer, the drop in modulus should not only be large and sharp but it should ideally be followed by an extended rubbery plateau SMP at original shape, temporary shape and recovered shape at T g + 20°C [40]. As seen in Figure 5, the addition of the BA-a also resulted in a systematic increase of the modulus in rubbery plateau region from 40 to 172 MPa.…”
Section: Dynamic Mechanical Analysis Of Ngde/pba-a Smpsmentioning
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“…The phenomenon is attributed to the addition of the more rigid molecular segments of the PBA-a in the NGDE/PBA-a shape memory samples. Moreover, to obtain the optimum performance for a shape-memory polymer, the drop in modulus should not only be large and sharp but it should ideally be followed by an extended rubbery plateau SMP at original shape, temporary shape and recovered shape at T g + 20°C [40]. As seen in Figure 5, the addition of the BA-a also resulted in a systematic increase of the modulus in rubbery plateau region from 40 to 172 MPa.…”
Section: Dynamic Mechanical Analysis Of Ngde/pba-a Smpsmentioning
“…However, a study of the comparative effect of various shape memory components in the shape memory properties of a given matrix has not been reported much. A few studies in these lines include; synthesis and shape memory properties of multiblock copolymers containing aramid hard segments and extended polycaprolactone soft segments . Poly(caprolactone)‐polyamide multiblock copolymers and styrene‐butadiene‐styrene tri‐block copolymer blends with PCL have been reported as shape memory polymers.…”
Section: Introductionmentioning
“…The Ogden model was tested further with two additional SMP material systems available in the literature: an epoxy‐based SMP and an aramid‐based SMP . Detailed information about the materials and the predictions are given in the appendix.…”
Section: Resultsmentioning
“…The Ogden model was further tested with two additional SMP material systems: an epoxy‐based SMP and an aramid‐based SMP …”
Section: Validation Of the Ogden Model With Additional Smp Materials Smentioning
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