Synthesis and characterization of polydimethylsiloxane-polyamide segmented copolymers

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dc.contributor.authorLee, Binen
dc.contributor.departmentChemistryen
dc.date.accessioned2014-08-13T14:40:12Zen
dc.date.available2014-08-13T14:40:12Zen
dc.date.issued1985en
dc.description.abstractThe polyamide poly(ε-caprolactam) or "nylon 6" is a very important fiber forming polymer which finds many applications in the carpet industry and elsewhere due to the very high strength of this fiber. However, a major drawback is its hydrophilicity. This feature influences both the surface and bulk mechanical behavior. Siloxane based macromolecules are hydrophobic, thermally stable and exhibit dimensional stability over a wide temperature range. Unlike the polyamide nylon 6, these hydrophobic materials display relatively low surface free energy. Thus, they can be used for the surface modification of nylon 6, provided a suitable adhesion or "anchoring" method is feasible. Polyamide-polydimethylsiloxane segmented or block copolymers were found to be suitable "interfacial" agents. They were synthesized by reacting aminopropyl-terminated polydimethylsiloxane (PDMS) oligomers with sebacyl chloride via an interfacial polymerization in which methylene chloride was used as the solvent or organic phase. A second diamine "chain extender" was also utilized, if desired. By varying the mole ratio of soft segment to the chain extender p-aminocyclohexylmethane (PACM-20), copolymers with various percentages of hard segments can be synthesized. Weight fractions of 2, 5, or 10% of the polyamide-poly-dimethylsiloxane block copolymers were physically melt mixed with nylon 6 in an extruder. The presence of polydimethylsiloxane on the surface of the blend was detected by determining the critical surface tensions of wetting using water as the contact angle test liquid. Such modified polyamides were successfully melt spun into fibers which displayed good mechanical properties and enhanced soil resistance. Fibers spun from these modified nylon 6 blends showed surface hydrophobicity. These modified polyamides or related materials may become technologically important in carpeting applications. Additional studies involving attempts at directly polymerizing ε-caprolactam via hydrolytic ring opening polymerization from functional polysiloxanes are also reported. In general, the structural integrity of these copolymers is less well defined. Certain procedures utilizing the aminopropyl polydimethylsiloxane initiated lactam oligomerization, followed by adipic acid chain extension produced interesting materials and should be further examined.en
dc.description.adminincomplete_metadataen
dc.description.degreeMaster of Scienceen
dc.format.extentix, 164 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/50043en
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 13052473en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1985.L425en
dc.subject.lcshBlock copolymersen
dc.subject.lcshPolymers -- Experimentsen
dc.subject.lcshPolyamidesen
dc.titleSynthesis and characterization of polydimethylsiloxane-polyamide segmented copolymersen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineChemistryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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