A new process for lamination of polymer films by 'bulk surface photografting' has been developed. The chemical component of the invention is that the curing of reactive solution between two substrates is initi...A new process for lamination of polymer films by 'bulk surface photografting' has been developed. The chemical component of the invention is that the curing of reactive solution between two substrates is initiated by the surface free radicals produced by aromatic ketones and surface-hydrogen of substrates. Using the new approach, two or more polymer films are bonded together by a grafted polymer network which is grafted to adjacent substrate surfaces. The technique has been applied to film substrates of different polymers such as polyolefins, polyesters, and polyamides which have abstractable hydrogens at the surface. The photolaminated film composites containing carrier films and an intermediate functional film of low permeability give strong laminates with high barrier properties, e.g, for oxygen and air.展开更多
In a polymerization model with low density polyethylene (LDPE) as the substrate and acrylic acid (AA) as the monomer, the performance of isopropylthioxanthone (ITX) in initiating surface photografting polymerization w...In a polymerization model with low density polyethylene (LDPE) as the substrate and acrylic acid (AA) as the monomer, the performance of isopropylthioxanthone (ITX) in initiating surface photografting polymerization was evaluated. The results show that the reactivity of photopolymerization and photografting of ITX locate between benzophenone (BP) and benzildimethylketal (BDK) for polymerization, BDK > ITX > BP; for surface grafting polymerization, BP > ITX > BDK. These results can be explained by a reaction mechanism of the inter-molecular or intra-molecular hydrogen abstraction reaction of ITX.展开更多
The surface of high strength and high modulus polyethylene (PE) fiber has been modified bygrafting with acrylic acid.Benzophenone and acrylic acid in vapor phase were UV-irradiated in thepresence of the PE tiber subst...The surface of high strength and high modulus polyethylene (PE) fiber has been modified bygrafting with acrylic acid.Benzophenone and acrylic acid in vapor phase were UV-irradiated in thepresence of the PE tiber substrate.Grafting with acrylic acid took place in a thin layer on the sur-face,thus increasing the surface adhesion of PE fiber with epoxy resin.This paper dealt withphoto-polymerization reactions including the role of photoinitiator.The degree of graft increasedwith the enhancing of reaction time,reaction temperature and concentration of initiator.Acetonewas used as carriers of monomer and tiator and able to initiate and promote grafting to the sur-face.ATR-IR and SEM measurements on the grafted surface showed that some polar groups wereintroduced to the surface of PE fibers.Oligomer which existed during the polymerization could beremoved by washing with benzene.展开更多
文摘A new process for lamination of polymer films by 'bulk surface photografting' has been developed. The chemical component of the invention is that the curing of reactive solution between two substrates is initiated by the surface free radicals produced by aromatic ketones and surface-hydrogen of substrates. Using the new approach, two or more polymer films are bonded together by a grafted polymer network which is grafted to adjacent substrate surfaces. The technique has been applied to film substrates of different polymers such as polyolefins, polyesters, and polyamides which have abstractable hydrogens at the surface. The photolaminated film composites containing carrier films and an intermediate functional film of low permeability give strong laminates with high barrier properties, e.g, for oxygen and air.
文摘In a polymerization model with low density polyethylene (LDPE) as the substrate and acrylic acid (AA) as the monomer, the performance of isopropylthioxanthone (ITX) in initiating surface photografting polymerization was evaluated. The results show that the reactivity of photopolymerization and photografting of ITX locate between benzophenone (BP) and benzildimethylketal (BDK) for polymerization, BDK > ITX > BP; for surface grafting polymerization, BP > ITX > BDK. These results can be explained by a reaction mechanism of the inter-molecular or intra-molecular hydrogen abstraction reaction of ITX.
文摘The surface of high strength and high modulus polyethylene (PE) fiber has been modified bygrafting with acrylic acid.Benzophenone and acrylic acid in vapor phase were UV-irradiated in thepresence of the PE tiber substrate.Grafting with acrylic acid took place in a thin layer on the sur-face,thus increasing the surface adhesion of PE fiber with epoxy resin.This paper dealt withphoto-polymerization reactions including the role of photoinitiator.The degree of graft increasedwith the enhancing of reaction time,reaction temperature and concentration of initiator.Acetonewas used as carriers of monomer and tiator and able to initiate and promote grafting to the sur-face.ATR-IR and SEM measurements on the grafted surface showed that some polar groups wereintroduced to the surface of PE fibers.Oligomer which existed during the polymerization could beremoved by washing with benzene.
