私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

相關鏈接
聯系方式
  • 通信地址:重慶市北碚區天生路2號
  • 郵編:400715
  • 電話:18580254939
  • 傳真:
  • Email:jbzeng@swu.edu.cn
當前位置:> 首頁 > 最新動態 > 正文
Macromolecules: 蓖麻油基聚氨酯脲動態共價鍵交聯網絡

Title:Sustainable, Malleable, and Recyclable Castor Oil-Derived Poly(urethane urea) Networks with Tunable Mechanical Properties and Shape Memory Performance Based on Dynamic Piperazine?Urea Bonds

Abstract:Castor oil (CO)-derived polyurethanes (PUs), denoted CPUs, are drastically limited because they cannot be reprocessed, reshaped, or recycled and because they show low strength, poor toughness, and insufficient functionality due to their permanently cross-linked structure with a high cross-link density and a soft backbone. Herein, we developed novel reversible piperazine?urea bonds (PaUBs) from inexpensive piperazines and isocyanates and incorporated the PaUBs into CPUs to fabricate sustainable and reprocessable poly(urethane urea) covalent adaptable networks (CANs). We synthesized the CANs from CO, N-(2-hydroxyethyl) piperazine (HEP), and 4-methylenedicyclohexyl diisocyanate (HMDI) via a catalyst- and solvent-free approach. The CANs showed variable tensile behavior over a wide range from a soft elastomer to tough and hard plastics. They also exhibited excellent malleability, stable reprocessability, and multiple recyclability, in which their original properties were recovered after several thermal recycling or remolding cycles. The CANs possessed excellent shape memory performance and reconfigurability, allowing them to be reprocessed into various complex shapes without using a mold. The advanced sustainable CANs based on dynamic PaUBs have great potential application as alternatives to traditional fossil-derived elastomers and plastics.

全文鏈接:https://pubs.acs.org/doi/10.1021/acs.macromol.2c00104

主站蜘蛛池模板: 巫溪县| 沾益县| 黄龙县| 礼泉县| 托里县| 永德县| 平遥县| 佛山市| 阿瓦提县| 衡水市| 普陀区| 乐昌市| 栖霞市| 双牌县| 桃江县| 天峨县| 益阳市| 微山县| 平泉县| 孟州市| 胶南市| 安义县| 三门县| 白城市| 寿宁县| 满洲里市| 铜山县| 高碑店市| 江川县| 绍兴市| 玉林市| 淮南市| 西丰县| 贡觉县| 咸宁市| 临江市| 斗六市| 威远县| 姜堰市| 大同县| 牟定县|