PCDLhais txog polycaprolactone diol, uas yog ib hom polyester polyol siv hauv polyurethane chemistry.
Hauv cov tshuab polyurethane, PCDL feem ntau yog siv los ua cov khoom muag muag. Nws ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab hloov pauv, hydrolysis tsis kam, lub zog siv tshuab, thiab kev ua haujlwm ntev ntawm cov khoom kawg. Piv nrog cov polyether polyols thiab cov polyester polyols, PCDL muaj qhov sib npaug ntawm kev ua tau zoo, tshwj xeeb tshaj yog nyob rau hauv kev thov kev lag luam.
Daim ntawv thov tseem ceeb ntawm PCDL yog nyob rau hauv polyurethane elastomers. Cov no suav nrog cam khwb cia polyurethane qhov chaw xws li rollers, log, seals, thiab bushings. Hauv cov ntawv thov no, cov ntaub ntawv raug rov qab ua dua tshiab, kev sib txhuam, thiab qee zaum ya raws lossis tshuaj lom. PCDL raws li polyurethane muab kev hnav zoo thiab ua haujlwm ruaj khov nyob rau lub sijhawm ua haujlwm ntev. Nws kuj yog siv dav hauv cov tshuab thermoplastic polyurethane, tshwj xeeb tshaj yog qhov yuav tsum muaj kev sib xyaw ua ke thiab lub zog.
Lwm daim ntawv thov tseem ceeb yog nyob rau hauv kev ua haujlwm siab txheej thiab cov nplaum. PCDL txhim kho lub zog adhesion, yoog raws, thiab tiv thaiv hydrolysis. Qhov no ua rau nws tsim nyog rau cov txheej txheem kev lag luam uas yuav tsum tau ua nyob rau hauv qhov chaw ntub lossis ntub dej. Nws kuj tseem siv rau hauv cov sealants tshwj xeeb uas yuav tsum tau ua kom ntev elasticity.
Hauv cov ntaub ntawv kho mob qib polyurethane, PCDL qee zaum raug xaiv vim nws cov qauv tshuaj lom neeg ruaj khov thiab zoo biocompatibility piv rau lwm cov polyester polyols. Nws yog siv rau hauv cov ntawv thov xws li tubing, catheters, thiab cov khoom siv kho mob muag muag uas qhov ruaj khov thiab ruaj khov yog qhov tseem ceeb.
PCDL kuj tseem siv rau hauv hydrolysis resistant polyurethane systems. Ib qho ntawm nws qhov txiaj ntsig tseem ceeb yog kev tiv thaiv zoo dua rau cov dej degradation piv nrog cov qauv polyester polyols. Qhov no ua rau nws tsim nyog rau cov ntawv thov xws li cov khoom siv sab nraum zoov, thaj chaw marine, thiab kev ua haujlwm ntub dej.
Txawm hais tias PCDL muaj qhov zoo ntawm kev ua tau zoo, muaj ntau lub ntsiab lus tseem ceeb uas yuav tsum tau xav txog. Thawj yog tus nqi. PCDL tseem kim dua li cov pa polyether polyols thiab cov qauv polyester polyols. Qhov no txhais tau hais tias nws yog feem ntau tshwj tseg rau nruab nrab mus rau siab kawg daim ntaub ntawv ntau dua li cov khoom lag luam uas tsis muaj nqi xws li cov ntaub ntawv ua npuas ncauj.
Qhov thib ob xav txog yog kev coj cwj pwm. PCDL raws li polyurethane systems yuav muaj viscosity siab dua nyob ntawm qhov hnyav molecular, uas tuaj yeem cuam tshuam rau kev sib xyaw thiab tuav thaum tsim khoom. Kev hloov kho kom raug yog feem ntau yuav tsum tau ua kom tiav cov kev ua haujlwm ruaj khov.
Qhov thib peb xav txog yog xaiv qhov hnyav molecular. PCDL muaj nyob rau hauv ntau qib xws li 1000, 2000, lossis 3000 molecular hnyav. Cov qib qis molecular hnyav feem ntau muab siab dua hardness thiab lub zog, thaum cov qib molecular hnyav dua muab kev yooj yim dua thiab elongation. Kev xaiv tsis raug tuaj yeem ua rau qhov tsis sib xws hauv kev ua haujlwm ntawm cov khoom kawg.
Qhov kev xav thib plaub yog kev sib raug zoo nrog lwm cov polyols. Hauv ntau cov qauv kev lag luam, PCDL yog sib xyaw nrog lwm cov polyether lossis polyester polyols kom ua tiav qhov sib npaug ntawm tus nqi thiab kev ua haujlwm. Kev nkag siab txog kev sib raug zoo yog qhov tseem ceeb kom tsis txhob muaj kev sib cais theem lossis kev coj tus cwj pwm tsis sib haum.