Synthesis Of Modified Cellulose- Grafted Composite And Their Structure- Property Study

Cellulose is semi-rigid, for the characteristic of abundant in nature, biodegradable, biocompatible, renewable, and environmental friendly, it has been widely used. Hence the cellulose-derived materials have application prospect in many areas. In this work, we use the renewable resources, cellulose, as object, a series of novel graft polymers having a significantly enhanced rheological and mechanical properties by the way of controlled living polymerization were prepared. The role of cellulose or rigid chain as additional cross-linking points in the cellulose graft copolymers was comprehensively investigated to clarify the relationship between the microstructures and mechanical properties. The details and key conclusions are described as follows:1. We prepared novel grafted copolymers based on these two bipolar polymers: cellulose and butyl acrylate. Cellulose-graft-poly(n-butyl acrylate) (cellulose-g-PBA) copolymers was synthesized via homogenous activator regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) using 2-bromopropionyl bromide modified cellulose as macroinitiator (cellulose-Br). And, the series of synthetic cellulose-g-PBA copolymers are with same backbone chain lengths but different side chain lengths. The relationship between structure and rheological property of cellulose-g-PBA copolymers were systemic investigated. The results show that the relative content of cellulose is closely related to the formation of network in matrix. Moreover, considering acrylic polymers are often used as pressure-sensitive adhesives (PSAs), so the mechanical deformation for cellulose-g-PBA copolymers were also investigated, the results of mechanical deformation indicate that the property of adhesion can be also modified by cellulose with different content.2. For perfecting mechanical properties of cellulose graft copolymer as pressure-sensitive adhesives (PSAs), we go on via homogenous activator regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) using cellulose-g-PBA as macroinitiator, to get cellulose-graft-PBA-block-PMMA copolymers (cellulose-g-PBA-b-PMMA). A series of synthetic cellulose-g-PBA-b-PMMA copolymers are with same backbone chain lengths and PBA side chain lengths but different PMMA side chain lengths. The relationship between structure and mechanical property of cellulose-g-PBA-b-PMMA copolymers were systemic investigated. The results show that the relative content of MMA is closely related to the formation of strain hardening phenomenon, which is necessary for a good pressure-sensitive adhesives (PSAs).