ʻO ke kumu o ka pale wela maikaʻi ʻole o PLA

ʻO PLA, kahi mea biodegradable, he semi-crystalline polymer me ka wela hoʻoheheʻe a hiki i 180 ℃.No laila no ke aha i ʻino loa ai ka mea i ka wela ke hana ʻia?

ʻO ke kumu nui ʻo ia ka lohi o ka crystallization rate o PLA a haʻahaʻa ka crystallinity o ka huahana i ke kaʻina hana maʻamau a me ka hoʻoheheʻe ʻana.Ma ke ʻano o ka hoʻolālā kemika, loaʻa i ke kaulahao mole o PLA kahi -CH3 ma ka atom carbon chiral, nona kahi ʻano helical maʻamau a me ka hana haʻahaʻa o nā ʻāpana kaulahao.ʻO ka hiki ke crystallization o nā mea polymer pili loa i ka hana o ke kaulahao mole a me ka hiki nucleation.I ke kaʻina hoʻoluʻu o ka hoʻoheheʻe ʻana maʻamau, liʻiliʻi loa ka puka aniani kūpono no ka crystallization, no laila he liʻiliʻi ka crystallinity o ka huahana hope a haʻahaʻa ka wela deformation wela.

ʻO ka hoʻololi ʻana i ka nucleation kahi ala kūpono e hoʻonui ai i ka crystallinity o PLA, e hoʻolōʻihi i ka helu crystallization, hoʻomaikaʻi i ka waiwai crystallization a pēlā e hoʻonui ai i ka pale wela o PLA.No laila, ʻo ka hoʻololi ʻana i nā mea PLA e like me ka nucleation, ka mālama ʻana i ka wela a me ka crosslinking he kuleana koʻikoʻi i ka hoʻonui ʻana i ka laulā noi o nā huahana PLA ma o ka hoʻonui ʻana i ka mahana deformation thermal a me ka hoʻomaikaʻi ʻana i kona kūpaʻa wela.

Hoʻokaʻawale ʻia nā mea hana nucleating i nā mea hana nucleating inorganic a me nā mea hana nucleating organik.ʻO nā mea hana nucleating inorganic ka nui o nā phyllosilicates, hydroxyapatite a me kāna mau derivatives, nā mea kalapona a me nā nanoparticles inorganic.ʻO ka pālolo kekahi ʻano o nā mea mineral silicate i hoʻohana mau ʻia i ka hoʻololi ʻana i ka PLA, a ma waena o ka montmorillonite ka mea ʻoi loa.ʻO nā mea hana nucleating nui: amide compound, bisylhydrazides a me biureas, biomass small molecules, organometallic phosphorus/phosphonate a me polyhedral oligosiloxy.

ʻOi aku ka maikaʻi o ka hoʻohui ʻana i nā mea hoʻohui nucleating paʻakikī e hoʻomaikaʻi i kona kūpaʻa wela ma mua o nā mea hoʻohui hoʻokahi.ʻO ke ʻano degradation nui o PLA ka hydrolysis ma hope o ka hygroscopic, no laila hiki ke hoʻohana ʻia ke ʻano o ka hoʻoheheʻe ʻana, me ka hoʻohui ʻana i ka ʻaila hydrophobic additive dimethylsilicone e hōʻemi i ka waiwai hygroscopic, e hoʻohui i nā mea hoʻohui alkaline e hōʻemi i ka helu degradation o PLA ma ka hoʻololi ʻana i ka waiwai PH o PLA.